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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

Browse source 
Pull generic execve() changes from Al Viro:
 "This introduces the generic kernel_thread() and kernel_execve()
  functions, and switches x86, arm, alpha, um and s390 over to them."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (26 commits)
  s390: convert to generic kernel_execve()
  s390: switch to generic kernel_thread()
  s390: fold kernel_thread_helper() into ret_from_fork()
  s390: fold execve_tail() into start_thread(), convert to generic sys_execve()
  um: switch to generic kernel_thread()
  x86, um/x86: switch to generic sys_execve and kernel_execve
  x86: split ret_from_fork
  alpha: introduce ret_from_kernel_execve(), switch to generic kernel_execve()
  alpha: switch to generic kernel_thread()
  alpha: switch to generic sys_execve()
  arm: get rid of execve wrapper, switch to generic execve() implementation
  arm: optimized current_pt_regs()
  arm: introduce ret_from_kernel_execve(), switch to generic kernel_execve()
  arm: split ret_from_fork, simplify kernel_thread() [based on patch by rmk]
  generic sys_execve()
  generic kernel_execve()
  new helper: current_pt_regs()
  preparation for generic kernel_thread()
  um: kill thread->forking
  um: let signal_delivered() do SIGTRAP on singlestepping into handler
  ...
This commit is contained in:
Linus Torvalds 2012-10-10 12:02:25 +09:00
commit 42859eea96
96 changed files with 391 additions and 900 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
arch/Kconfig
View file

@ -271,6 +271,9 @@ config ARCH_WANT_OLD_COMPAT_IPC
select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
bool
config GENERIC_KERNEL_THREAD
bool
config HAVE_ARCH_SECCOMP_FILTER
bool
help

1
arch/alpha/Kconfig
View file

@ -20,6 +20,7 @@ config ALPHA
select GENERIC_CMOS_UPDATE
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select GENERIC_KERNEL_THREAD
help
The Alpha is a 64-bit general-purpose processor designed and
marketed by the Digital Equipment Corporation of blessed memory,

1
arch/alpha/include/asm/Kbuild
View file

@ -10,3 +10,4 @@ header-y += pal.h
header-y += reg.h
header-y += regdef.h
header-y += sysinfo.h
generic-y += exec.h

6
arch/alpha/include/asm/exec.h
View file

@ -1,6 +0,0 @@
#ifndef __ALPHA_EXEC_H
#define __ALPHA_EXEC_H
#define arch_align_stack(x) (x)
#endif /* __ALPHA_EXEC_H */

3
arch/alpha/include/asm/processor.h
View file

@ -49,9 +49,6 @@ extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/* Create a kernel thread without removing it from tasklists. */
extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)

2
arch/alpha/include/asm/unistd.h
View file

@ -481,6 +481,8 @@
#define __ARCH_WANT_SYS_OLDUMOUNT
#define __ARCH_WANT_SYS_SIGPENDING
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_KERNEL_EXECVE
/* "Conditional" syscalls. What we want is

3
arch/alpha/kernel/alpha_ksyms.c
View file

@ -50,9 +50,6 @@ EXPORT_SYMBOL(alpha_read_fp_reg_s);
EXPORT_SYMBOL(alpha_write_fp_reg);
EXPORT_SYMBOL(alpha_write_fp_reg_s);
/* entry.S */
EXPORT_SYMBOL(kernel_thread);
/* Networking helper routines. */
EXPORT_SYMBOL(csum_tcpudp_magic);
EXPORT_SYMBOL(ip_compute_csum);

69
arch/alpha/kernel/entry.S
View file

@ -609,59 +609,35 @@ ret_from_fork:
.end ret_from_fork
/*
* kernel_thread(fn, arg, clone_flags)
* ... and new kernel threads - here
*/
.align 4
.globl kernel_thread
.ent kernel_thread
kernel_thread:
/* We can be called from a module. */
ldgp $gp, 0($27)
.prologue 1
subq $sp, SP_OFF+6*8, $sp
br $1, 2f /* load start address */
/* We've now "returned" from a fake system call. */
unop
blt $0, 1f /* error? */
ldi $1, 0x3fff
beq $20, 1f /* parent or child? */
bic $sp, $1, $8 /* in child. */
jsr $26, ($27)
.globl ret_from_kernel_thread
.ent ret_from_kernel_thread
ret_from_kernel_thread:
mov $17, $16
jsr $26, schedule_tail
mov $9, $27
mov $10, $16
jsr $26, ($9)
ldgp $gp, 0($26)
mov $0, $16
mov $31, $26
jmp $31, sys_exit
.end ret_from_kernel_thread
1: ret /* in parent. */
.align 4
2: /* Fake a system call stack frame, as we can't do system calls
from kernel space. Note that we store FN and ARG as they
need to be set up in the child for the call. Also store $8
and $26 for use in the parent. */
stq $31, SP_OFF($sp) /* ps */
stq $1, SP_OFF+8($sp) /* pc */
stq $gp, SP_OFF+16($sp) /* gp */
stq $16, 136($sp) /* $27; FN for child */
stq $17, SP_OFF+24($sp) /* $16; ARG for child */
stq $8, 64($sp) /* $8 */
stq $26, 128($sp) /* $26 */
.globl ret_from_kernel_execve
.align 4
.ent ret_from_kernel_execve
ret_from_kernel_execve:
mov $16, $sp
/* Avoid the HAE being gratuitously wrong, to avoid restoring it. */
ldq $2, alpha_mv+HAE_CACHE
stq $2, 152($sp) /* HAE */
mov $31, $19 /* to disable syscall restarts */
br $31, ret_to_user
/* Shuffle FLAGS to the front; add CLONE_VM. */
ldi $1, CLONE_VM|CLONE_UNTRACED
or $18, $1, $16
bsr $26, sys_clone
/* We don't actually care for a3 success widgetry in the kernel.
Not for positive errno values. */
stq $0, 0($sp) /* $0 */
br ret_to_kernel
.end kernel_thread
.end ret_from_kernel_execve
/*
@ -744,15 +720,6 @@ sys_rt_sigreturn:
br ret_from_sys_call
.end sys_rt_sigreturn
.align 4
.globl sys_execve
.ent sys_execve
sys_execve:
.prologue 0
mov $sp, $19
jmp $31, do_sys_execve
.end sys_execve
.align 4
.globl alpha_ni_syscall
.ent alpha_ni_syscall

77
arch/alpha/kernel/process.c
View file

@ -263,33 +263,35 @@ alpha_vfork(struct pt_regs *regs)
/*
* Copy an alpha thread..
*
* Note the "stack_offset" stuff: when returning to kernel mode, we need
* to have some extra stack-space for the kernel stack that still exists
* after the "ret_from_fork". When returning to user mode, we only want
* the space needed by the syscall stack frame (ie "struct pt_regs").
* Use the passed "regs" pointer to determine how much space we need
* for a kernel fork().
*/
int
copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long unused,
unsigned long arg,
struct task_struct * p, struct pt_regs * regs)
{
extern void ret_from_fork(void);
extern void ret_from_kernel_thread(void);
struct thread_info *childti = task_thread_info(p);
struct pt_regs * childregs;
struct switch_stack * childstack, *stack;
unsigned long stack_offset, settls;
struct pt_regs *childregs = task_pt_regs(p);
struct switch_stack *childstack, *stack;
unsigned long settls;
stack_offset = PAGE_SIZE - sizeof(struct pt_regs);
if (!(regs->ps & 8))
stack_offset = (PAGE_SIZE-1) & (unsigned long) regs;
childregs = (struct pt_regs *)
(stack_offset + PAGE_SIZE + task_stack_page(p));
childstack = ((struct switch_stack *) childregs) - 1;
if (unlikely(!regs)) {
/* kernel thread */
memset(childstack, 0,
sizeof(struct switch_stack) + sizeof(struct pt_regs));
childstack->r26 = (unsigned long) ret_from_kernel_thread;
childstack->r9 = usp; /* function */
childstack->r10 = arg;
childregs->hae = alpha_mv.hae_cache,
childti->pcb.usp = 0;
childti->pcb.ksp = (unsigned long) childstack;
childti->pcb.flags = 1; /* set FEN, clear everything else */
return 0;
}
*childregs = *regs;
settls = regs->r20;
childregs->r0 = 0;
@ -297,7 +299,6 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
childregs->r20 = 1; /* OSF/1 has some strange fork() semantics. */
regs->r20 = 0;
stack = ((struct switch_stack *) regs) - 1;
childstack = ((struct switch_stack *) childregs) - 1;
*childstack = *stack;
childstack->r26 = (unsigned long) ret_from_fork;
childti->pcb.usp = usp;
@ -385,27 +386,6 @@ dump_elf_task_fp(elf_fpreg_t *dest, struct task_struct *task)
}
EXPORT_SYMBOL(dump_elf_task_fp);
/*
* sys_execve() executes a new program.
*/
asmlinkage int
do_sys_execve(const char __user *ufilename,
const char __user *const __user *argv,
const char __user *const __user *envp, struct pt_regs *regs)
{
int error;
char *filename;
filename = getname(ufilename);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, argv, envp, regs);
putname(filename);
out:
return error;
}
/*
* Return saved PC of a blocked thread. This assumes the frame
* pointer is the 6th saved long on the kernel stack and that the
@ -459,22 +439,3 @@ get_wchan(struct task_struct *p)
}
return pc;
}
int kernel_execve(const char *path, const char *const argv[], const char *const envp[])
{
/* Avoid the HAE being gratuitously wrong, which would cause us
to do the whole turn off interrupts thing and restore it. */
struct pt_regs regs = {.hae = alpha_mv.hae_cache};
int err = do_execve(path, argv, envp, &regs);
if (!err) {
struct pt_regs *p = current_pt_regs();
/* copy regs to normal position and off to userland we go... */
*p = regs;
__asm__ __volatile__ (
"mov %0, $sp;"
"br $31, ret_from_sys_call"
: : "r"(p));
}
return err;
}
EXPORT_SYMBOL(kernel_execve);

1
arch/arm/Kconfig
View file

@ -52,6 +52,7 @@ config ARM
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN
select GENERIC_KERNEL_THREAD
help
The ARM series is a line of low-power-consumption RISC chip designs
licensed by ARM Ltd and targeted at embedded applications and

5
arch/arm/include/asm/processor.h
View file

@ -85,11 +85,6 @@ unsigned long get_wchan(struct task_struct *p);
#define cpu_relax() barrier()
#endif
/*
* Create a new kernel thread
*/
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
#define task_pt_regs(p) \
((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)

5
arch/arm/include/asm/ptrace.h
View file

@ -254,6 +254,11 @@ static inline unsigned long user_stack_pointer(struct pt_regs *regs)
return regs->ARM_sp;
}
#define current_pt_regs(void) ({ \
register unsigned long sp asm ("sp"); \
(struct pt_regs *)((sp | (THREAD_SIZE - 1)) - 7) - 1; \
})
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */

1
arch/arm/include/asm/system.h
View file

@ -2,7 +2,6 @@
#include <asm/barrier.h>
#include <asm/compiler.h>
#include <asm/cmpxchg.h>
#include <asm/exec.h>
#include <asm/switch_to.h>
#include <asm/system_info.h>
#include <asm/system_misc.h>

2
arch/arm/include/asm/unistd.h
View file

@ -478,6 +478,8 @@
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_SYS_SOCKETCALL
#endif
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls

2
arch/arm/kernel/calls.S
View file

@ -20,7 +20,7 @@
CALL(sys_creat)
CALL(sys_link)
/* 10 */ CALL(sys_unlink)
CALL(sys_execve_wrapper)
CALL(sys_execve)
CALL(sys_chdir)
CALL(OBSOLETE(sys_time)) /* used by libc4 */
CALL(sys_mknod)

29
arch/arm/kernel/entry-common.S
View file

@ -91,6 +91,30 @@ ENTRY(ret_from_fork)
b ret_slow_syscall
ENDPROC(ret_from_fork)
ENTRY(ret_from_kernel_thread)
UNWIND(.fnstart)
UNWIND(.cantunwind)
bl schedule_tail
mov r0, r4
adr lr, BSYM(1f) @ kernel threads should not exit
mov pc, r5
1: bl do_exit
nop
UNWIND(.fnend)
ENDPROC(ret_from_kernel_thread)
/*
* turn a kernel thread into userland process
* use: ret_from_kernel_execve(struct pt_regs *normal)
*/
ENTRY(ret_from_kernel_execve)
mov why, #0 @ not a syscall
str why, [r0, #S_R0] @ ... and we want 0 in ->ARM_r0 as well
get_thread_info tsk @ thread structure
mov sp, r0 @ stack pointer just under pt_regs
b ret_slow_syscall
ENDPROC(ret_from_kernel_execve)
.equ NR_syscalls,0
#define CALL(x) .equ NR_syscalls,NR_syscalls+1
#include "calls.S"
@ -517,11 +541,6 @@ sys_vfork_wrapper:
b sys_vfork
ENDPROC(sys_vfork_wrapper)
sys_execve_wrapper:
add r3, sp, #S_OFF
b sys_execve
ENDPROC(sys_execve_wrapper)
sys_clone_wrapper:
add ip, sp, #S_OFF
str ip, [sp, #4]

75
arch/arm/kernel/process.c
View file

@ -373,6 +373,7 @@ void release_thread(struct task_struct *dead_task)
}
asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
asmlinkage void ret_from_kernel_thread(void) __asm__("ret_from_kernel_thread");
int
copy_thread(unsigned long clone_flags, unsigned long stack_start,
@ -381,13 +382,20 @@ copy_thread(unsigned long clone_flags, unsigned long stack_start,
struct thread_info *thread = task_thread_info(p);
struct pt_regs *childregs = task_pt_regs(p);
*childregs = *regs;
childregs->ARM_r0 = 0;
childregs->ARM_sp = stack_start;
memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
if (likely(regs)) {
*childregs = *regs;
childregs->ARM_r0 = 0;
childregs->ARM_sp = stack_start;
thread->cpu_context.pc = (unsigned long)ret_from_fork;
} else {
thread->cpu_context.r4 = stk_sz;
thread->cpu_context.r5 = stack_start;
thread->cpu_context.pc = (unsigned long)ret_from_kernel_thread;
childregs->ARM_cpsr = SVC_MODE;
}
thread->cpu_context.sp = (unsigned long)childregs;
thread->cpu_context.pc = (unsigned long)ret_from_fork;
clear_ptrace_hw_breakpoint(p);
@ -423,63 +431,6 @@ int dump_fpu (struct pt_regs *regs, struct user_fp *fp)
}
EXPORT_SYMBOL(dump_fpu);
/*
* Shuffle the argument into the correct register before calling the
* thread function. r4 is the thread argument, r5 is the pointer to
* the thread function, and r6 points to the exit function.
*/
extern void kernel_thread_helper(void);
asm( ".pushsection .text\n"
" .align\n"
" .type kernel_thread_helper, #function\n"
"kernel_thread_helper:\n"
#ifdef CONFIG_TRACE_IRQFLAGS
" bl trace_hardirqs_on\n"
#endif
" msr cpsr_c, r7\n"
" mov r0, r4\n"
" mov lr, r6\n"
" mov pc, r5\n"
" .size kernel_thread_helper, . - kernel_thread_helper\n"
" .popsection");
#ifdef CONFIG_ARM_UNWIND
extern void kernel_thread_exit(long code);
asm( ".pushsection .text\n"
" .align\n"
" .type kernel_thread_exit, #function\n"
"kernel_thread_exit:\n"
" .fnstart\n"
" .cantunwind\n"
" bl do_exit\n"
" nop\n"
" .fnend\n"
" .size kernel_thread_exit, . - kernel_thread_exit\n"
" .popsection");
#else
#define kernel_thread_exit do_exit
#endif
/*
* Create a kernel thread.
*/
pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.ARM_r4 = (unsigned long)arg;
regs.ARM_r5 = (unsigned long)fn;
regs.ARM_r6 = (unsigned long)kernel_thread_exit;
regs.ARM_r7 = SVC_MODE | PSR_ENDSTATE | PSR_ISETSTATE;
regs.ARM_pc = (unsigned long)kernel_thread_helper;
regs.ARM_cpsr = regs.ARM_r7 | PSR_I_BIT;
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);
unsigned long get_wchan(struct task_struct *p)
{
struct stackframe frame;

63
arch/arm/kernel/sys_arm.c
View file

@ -59,69 +59,6 @@ asmlinkage int sys_vfork(struct pt_regs *regs)
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
}
/* sys_execve() executes a new program.
* This is called indirectly via a small wrapper
*/
asmlinkage int sys_execve(const char __user *filenamei,
const char __user *const __user *argv,
const char __user *const __user *envp, struct pt_regs *regs)
{
int error;
char * filename;
filename = getname(filenamei);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, argv, envp, regs);
putname(filename);
out:
return error;
}
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
struct pt_regs regs;
int ret;
memset(&regs, 0, sizeof(struct pt_regs));
ret = do_execve(filename,
(const char __user *const __user *)argv,
(const char __user *const __user *)envp, &regs);
if (ret < 0)
goto out;
/*
* Save argc to the register structure for userspace.
*/
regs.ARM_r0 = ret;
/*
* We were successful. We won't be returning to our caller, but
* instead to user space by manipulating the kernel stack.
*/
asm( "add r0, %0, %1\n\t"
"mov r1, %2\n\t"
"mov r2, %3\n\t"
"bl memmove\n\t" /* copy regs to top of stack */
"mov r8, #0\n\t" /* not a syscall */
"mov r9, %0\n\t" /* thread structure */
"mov sp, r0\n\t" /* reposition stack pointer */
"b ret_to_user"
:
: "r" (current_thread_info()),
"Ir" (THREAD_START_SP - sizeof(regs)),
"r" (&regs),
"Ir" (sizeof(regs))
: "r0", "r1", "r2", "r3", "r8", "r9", "ip", "lr", "memory");
out:
return ret;
}
EXPORT_SYMBOL(kernel_execve);
/*
* Since loff_t is a 64 bit type we avoid a lot of ABI hassle
* with a different argument ordering.

1
arch/avr32/include/asm/Kbuild
View file

@ -1,5 +1,6 @@
include include/asm-generic/Kbuild.asm
generic-y += clkdev.h
generic-y += exec.h
header-y += cachectl.h

13
arch/avr32/include/asm/exec.h
View file

@ -1,13 +0,0 @@
/*
* Copyright (C) 2004-2006 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_AVR32_EXEC_H
#define __ASM_AVR32_EXEC_H
#define arch_align_stack(x) (x)
#endif /* __ASM_AVR32_EXEC_H */

1
arch/c6x/include/asm/Kbuild
View file

@ -12,6 +12,7 @@ generic-y += div64.h
generic-y += dma.h
generic-y += emergency-restart.h
generic-y += errno.h
generic-y += exec.h
generic-y += fb.h
generic-y += fcntl.h
generic-y += futex.h

6
arch/c6x/include/asm/exec.h
View file

@ -1,6 +0,0 @@
#ifndef _ASM_C6X_EXEC_H
#define _ASM_C6X_EXEC_H
#define arch_align_stack(x) (x)
#endif /* _ASM_C6X_EXEC_H */

1
arch/cris/include/asm/Kbuild
View file

@ -9,3 +9,4 @@ header-y += rs485.h
header-y += sync_serial.h
generic-y += clkdev.h
generic-y += exec.h

6
arch/cris/include/asm/exec.h
View file

@ -1,6 +0,0 @@
#ifndef __ASM_CRIS_EXEC_H
#define __ASM_CRIS_EXEC_H
#define arch_align_stack(x) (x)
#endif /* __ASM_CRIS_EXEC_H */

1
arch/frv/include/asm/Kbuild
View file

@ -3,3 +3,4 @@ include include/asm-generic/Kbuild.asm
header-y += registers.h
header-y += termios.h
generic-y += clkdev.h
generic-y += exec.h

17
arch/frv/include/asm/exec.h
View file

@ -1,17 +0,0 @@
/* FR-V CPU executable handling
*
* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _ASM_EXEC_H
#define _ASM_EXEC_H
#define arch_align_stack(x) (x)
#endif /* _ASM_EXEC_H */

3
arch/h8300/include/asm/Kbuild
View file

@ -1,3 +1,4 @@
include include/asm-generic/Kbuild.asm
generic-y += clkdev.h
generic-y += clkdev.h
generic-y += exec.h

6
arch/h8300/include/asm/exec.h
View file

@ -1,6 +0,0 @@
#ifndef _H8300_EXEC_H
#define _H8300_EXEC_H
#define arch_align_stack(x) (x)
#endif /* _H8300_EXEC_H */

1
arch/hexagon/kernel/syscall.c
View file

@ -87,4 +87,3 @@ int kernel_execve(const char *filename,
return retval;
}
EXPORT_SYMBOL(kernel_execve);

1
arch/ia64/include/asm/Kbuild
View file

@ -14,3 +14,4 @@ header-y += rse.h
header-y += ucontext.h
header-y += ustack.h
generic-y += clkdev.h
generic-y += exec.h

14
arch/ia64/include/asm/exec.h
View file

@ -1,14 +0,0 @@
/*
* Process execution defines.
*
* Copyright (C) 1998-2003 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
* Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
* Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
*/
#ifndef _ASM_IA64_EXEC_H
#define _ASM_IA64_EXEC_H
#define arch_align_stack(x) (x)
#endif /* _ASM_IA64_EXEC_H */

3
arch/m32r/include/asm/Kbuild
View file

@ -1,3 +1,4 @@
include include/asm-generic/Kbuild.asm
generic-y += clkdev.h
generic-y += clkdev.h
generic-y += exec.h

14
arch/m32r/include/asm/exec.h
View file

@ -1,14 +0,0 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2001 Hiroyuki Kondo, Hirokazu Takata, and Hitoshi Yamamoto
* Copyright (C) 2004, 2006 Hirokazu Takata <takata at linux-m32r.org>
*/
#ifndef _ASM_M32R_EXEC_H
#define _ASM_M32R_EXEC_H
#define arch_align_stack(x) (x)
#endif /* _ASM_M32R_EXEC_H */

1
arch/m68k/include/asm/Kbuild
View file

@ -7,6 +7,7 @@ generic-y += cputime.h
generic-y += device.h
generic-y += emergency-restart.h
generic-y += errno.h
generic-y += exec.h
generic-y += futex.h
generic-y += ioctl.h
generic-y += ipcbuf.h

6
arch/m68k/include/asm/exec.h
View file

@ -1,6 +0,0 @@
#ifndef _M68K_EXEC_H
#define _M68K_EXEC_H
#define arch_align_stack(x) (x)
#endif /* _M68K_EXEC_H */

1
arch/microblaze/include/asm/Kbuild
View file

@ -2,3 +2,4 @@ include include/asm-generic/Kbuild.asm
header-y += elf.h
generic-y += clkdev.h
generic-y += exec.h

14
arch/microblaze/include/asm/exec.h
View file

@ -1,14 +0,0 @@
/*
* Copyright (C) 2006 Atmark Techno, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#ifndef _ASM_MICROBLAZE_EXEC_H
#define _ASM_MICROBLAZE_EXEC_H
#define arch_align_stack(x) (x)
#endif /* _ASM_MICROBLAZE_EXEC_H */

1
arch/mn10300/include/asm/Kbuild
View file

@ -1,3 +1,4 @@
include include/asm-generic/Kbuild.asm
generic-y += clkdev.h
generic-y += exec.h

16
arch/mn10300/include/asm/exec.h
View file

@ -1,16 +0,0 @@
/* MN10300 process execution definitions
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#ifndef _ASM_EXEC_H
#define _ASM_EXEC_H
#define arch_align_stack(x) (x)
#endif /* _ASM_EXEC_H */

1
arch/parisc/include/asm/Kbuild
View file

@ -3,3 +3,4 @@ include include/asm-generic/Kbuild.asm
header-y += pdc.h
generic-y += clkdev.h
generic-y += word-at-a-time.h
generic-y += exec.h

6
arch/parisc/include/asm/exec.h
View file

@ -1,6 +0,0 @@
#ifndef __PARISC_EXEC_H
#define __PARISC_EXEC_H
#define arch_align_stack(x) (x)
#endif /* __PARISC_EXEC_H */

1
arch/s390/Kconfig
View file

@ -135,6 +135,7 @@ config S390
select GENERIC_CLOCKEVENTS
select KTIME_SCALAR if 32BIT
select HAVE_ARCH_SECCOMP_FILTER
select GENERIC_KERNEL_THREAD
config SCHED_OMIT_FRAME_POINTER
def_bool y

4
arch/s390/include/asm/processor.h
View file

@ -35,6 +35,7 @@ static inline void get_cpu_id(struct cpuid *ptr)
extern void s390_adjust_jiffies(void);
extern const struct seq_operations cpuinfo_op;
extern int sysctl_ieee_emulation_warnings;
extern void execve_tail(void);
/*
* User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
@ -126,6 +127,7 @@ struct stack_frame {
regs->psw.mask = psw_user_bits | PSW_MASK_EA | PSW_MASK_BA; \
regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
regs->gprs[15] = new_stackp; \
execve_tail(); \
} while (0)
#define start_thread31(regs, new_psw, new_stackp) do { \
@ -135,6 +137,7 @@ struct stack_frame {
__tlb_flush_mm(current->mm); \
crst_table_downgrade(current->mm, 1UL << 31); \
update_mm(current->mm, current); \
execve_tail(); \
} while (0)
/* Forward declaration, a strange C thing */
@ -150,7 +153,6 @@ static inline void show_cacheinfo(struct seq_file *m) { }
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/*
* Return saved PC of a blocked thread.

2
arch/s390/include/asm/unistd.h
View file

@ -417,6 +417,8 @@
# define __ARCH_WANT_COMPAT_SYS_TIME
# define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
# endif
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls

26
arch/s390/kernel/compat_linux.c
View file

@ -432,32 +432,6 @@ sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
return ret;
}
/*
* sys32_execve() executes a new program after the asm stub has set
* things up for us. This should basically do what I want it to.
*/
asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
compat_uptr_t __user *envp)
{
struct pt_regs *regs = task_pt_regs(current);
char *filename;
long rc;
filename = getname(name);
rc = PTR_ERR(filename);
if (IS_ERR(filename))
return rc;
rc = compat_do_execve(filename, argv, envp, regs);
if (rc)
goto out;
current->thread.fp_regs.fpc=0;
asm volatile("sfpc %0,0" : : "d" (0));
rc = regs->gprs[2];
out:
putname(filename);
return rc;
}
asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
size_t count, u32 poshi, u32 poslo)
{

2
arch/s390/kernel/compat_linux.h
View file

@ -125,8 +125,6 @@ long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
compat_sigset_t __user *oset, size_t sigsetsize);
long sys32_rt_sigpending(compat_sigset_t __user *set, size_t sigsetsize);
long sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo);
long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
compat_uptr_t __user *envp);
long sys32_init_module(void __user *umod, unsigned long len,
const char __user *uargs);
long sys32_delete_module(const char __user *name_user, unsigned int flags);

2
arch/s390/kernel/compat_wrapper.S
View file

@ -1576,7 +1576,7 @@ ENTRY(sys32_execve_wrapper)
llgtr %r2,%r2 # char *
llgtr %r3,%r3 # compat_uptr_t *
llgtr %r4,%r4 # compat_uptr_t *
jg sys32_execve # branch to system call
jg compat_sys_execve # branch to system call
ENTRY(sys_fanotify_init_wrapper)
llgfr %r2,%r2 # unsigned int

51
arch/s390/kernel/entry.S
View file

@ -331,45 +331,38 @@ ENTRY(ret_from_fork)
l %r12,__LC_THREAD_INFO
l %r13,__LC_SVC_NEW_PSW+4
tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
jo 0f
st %r15,__PT_R15(%r11) # store stack pointer for new kthread
0: l %r1,BASED(.Lschedule_tail)
je 1f
l %r1,BASED(.Lschedule_tail)
basr %r14,%r1 # call schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
j sysc_tracenogo
1: # it's a kernel thread
st %r15,__PT_R15(%r11) # store stack pointer for new kthread
l %r1,BASED(.Lschedule_tail)
basr %r14,%r1 # call schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
lm %r9,%r11,__PT_R9(%r11) # load gprs
ENTRY(kernel_thread_starter)
la %r2,0(%r10)
basr %r14,%r9
la %r2,0
br %r11 # do_exit
#
# kernel_execve function needs to deal with pt_regs that is not
# at the usual place
#
ENTRY(kernel_execve)
stm %r12,%r15,48(%r15)
lr %r14,%r15
l %r13,__LC_SVC_NEW_PSW+4
ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
st %r14,__SF_BACKCHAIN(%r15)
la %r12,STACK_FRAME_OVERHEAD(%r15)
xc 0(__PT_SIZE,%r12),0(%r12)
l %r1,BASED(.Ldo_execve)
lr %r5,%r12
basr %r14,%r1 # call do_execve
ltr %r2,%r2
je 0f
ahi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE)
lm %r12,%r15,48(%r15)
br %r14
# execve succeeded.
0: ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
l %r15,__LC_KERNEL_STACK # load ksp
ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
la %r11,STACK_FRAME_OVERHEAD(%r15)
mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs
l %r12,__LC_THREAD_INFO
ENTRY(ret_from_kernel_execve)
ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
lr %r15,%r2
lr %r11,%r2
ahi %r15,-STACK_FRAME_OVERHEAD
xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
l %r12,__LC_THREAD_INFO
ssm __LC_SVC_NEW_PSW # reenable interrupts
l %r1,BASED(.Lexecve_tail)
basr %r14,%r1 # call execve_tail
j sysc_return
/*
@ -931,8 +924,6 @@ cleanup_idle_wait:
.Ldo_signal: .long do_signal
.Ldo_notify_resume: .long do_notify_resume
.Ldo_per_trap: .long do_per_trap
.Ldo_execve: .long do_execve
.Lexecve_tail: .long execve_tail
.Ljump_table: .long pgm_check_table
.Lschedule: .long schedule
#ifdef CONFIG_PREEMPT

3
arch/s390/kernel/entry.h
View file

@ -58,9 +58,6 @@ long sys_fork(void);
long sys_clone(unsigned long newsp, unsigned long clone_flags,
int __user *parent_tidptr, int __user *child_tidptr);
long sys_vfork(void);
void execve_tail(void);
long sys_execve(const char __user *name, const char __user *const __user *argv,
const char __user *const __user *envp);
long sys_sigsuspend(int history0, int history1, old_sigset_t mask);
long sys_sigaction(int sig, const struct old_sigaction __user *act,
struct old_sigaction __user *oact);

52
arch/s390/kernel/entry64.S
View file

@ -353,41 +353,31 @@ ENTRY(ret_from_fork)
la %r11,STACK_FRAME_OVERHEAD(%r15)
lg %r12,__LC_THREAD_INFO
tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
jo 0f
stg %r15,__PT_R15(%r11) # store stack pointer for new kthread
0: brasl %r14,schedule_tail
je 1f
brasl %r14,schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
j sysc_tracenogo
#
# kernel_execve function needs to deal with pt_regs that is not
# at the usual place
#
ENTRY(kernel_execve)
stmg %r12,%r15,96(%r15)
lgr %r14,%r15
aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
stg %r14,__SF_BACKCHAIN(%r15)
la %r12,STACK_FRAME_OVERHEAD(%r15)
xc 0(__PT_SIZE,%r12),0(%r12)
lgr %r5,%r12
brasl %r14,do_execve
ltgfr %r2,%r2
je 0f
aghi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE)
lmg %r12,%r15,96(%r15)
br %r14
# execve succeeded.
0: ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
lg %r15,__LC_KERNEL_STACK # load ksp
aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
la %r11,STACK_FRAME_OVERHEAD(%r15)
mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs
lg %r12,__LC_THREAD_INFO
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
1: # it's a kernel thread
stg %r15,__PT_R15(%r11) # store stack pointer for new kthread
brasl %r14,schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
lmg %r9,%r11,__PT_R9(%r11) # load gprs
ENTRY(kernel_thread_starter)
la %r2,0(%r10)
basr %r14,%r9
la %r2,0
br %r11 # do_exit
ENTRY(ret_from_kernel_execve)
ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
lgr %r15,%r2
lgr %r11,%r2
aghi %r15,-STACK_FRAME_OVERHEAD
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
lg %r12,__LC_THREAD_INFO
ssm __LC_SVC_NEW_PSW # reenable interrupts
brasl %r14,execve_tail
j sysc_return
/*

107
arch/s390/kernel/process.c
View file

@ -100,35 +100,6 @@ void cpu_idle(void)
extern void __kprobes kernel_thread_starter(void);
asm(
".section .kprobes.text, \"ax\"\n"
".global kernel_thread_starter\n"
"kernel_thread_starter:\n"
" la 2,0(10)\n"
" basr 14,9\n"
" la 2,0\n"
" br 11\n"
".previous\n");
int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.psw.mask = psw_kernel_bits |
PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
regs.psw.addr = (unsigned long) kernel_thread_starter | PSW_ADDR_AMODE;
regs.gprs[9] = (unsigned long) fn;
regs.gprs[10] = (unsigned long) arg;
regs.gprs[11] = (unsigned long) do_exit;
regs.orig_gpr2 = -1;
/* Ok, create the new process.. */
return do_fork(flags | CLONE_VM | CLONE_UNTRACED,
0, &regs, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);
/*
* Free current thread data structures etc..
*/
@ -146,7 +117,7 @@ void release_thread(struct task_struct *dead_task)
}
int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
unsigned long unused,
unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct thread_info *ti;
@ -158,20 +129,44 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
frame = container_of(task_pt_regs(p), struct fake_frame, childregs);
p->thread.ksp = (unsigned long) frame;
/* Store access registers to kernel stack of new process. */
frame->childregs = *regs;
frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */
frame->childregs.gprs[15] = new_stackp;
frame->sf.back_chain = 0;
/* Save access registers to new thread structure. */
save_access_regs(&p->thread.acrs[0]);
/* start new process with ar4 pointing to the correct address space */
p->thread.mm_segment = get_fs();
/* Don't copy debug registers */
memset(&p->thread.per_user, 0, sizeof(p->thread.per_user));
memset(&p->thread.per_event, 0, sizeof(p->thread.per_event));
clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
clear_tsk_thread_flag(p, TIF_PER_TRAP);
/* Initialize per thread user and system timer values */
ti = task_thread_info(p);
ti->user_timer = 0;
ti->system_timer = 0;
frame->sf.back_chain = 0;
/* new return point is ret_from_fork */
frame->sf.gprs[8] = (unsigned long) ret_from_fork;
/* fake return stack for resume(), don't go back to schedule */
frame->sf.gprs[9] = (unsigned long) frame;
/* Save access registers to new thread structure. */
save_access_regs(&p->thread.acrs[0]);
/* Store access registers to kernel stack of new process. */
if (unlikely(!regs)) {
/* kernel thread */
memset(&frame->childregs, 0, sizeof(struct pt_regs));
frame->childregs.psw.mask = psw_kernel_bits | PSW_MASK_DAT |
PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
frame->childregs.psw.addr = PSW_ADDR_AMODE |
(unsigned long) kernel_thread_starter;
frame->childregs.gprs[9] = new_stackp; /* function */
frame->childregs.gprs[10] = arg;
frame->childregs.gprs[11] = (unsigned long) do_exit;
frame->childregs.orig_gpr2 = -1;
return 0;
}
frame->childregs = *regs;
frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */
frame->childregs.gprs[15] = new_stackp;
/* Don't copy runtime instrumentation info */
p->thread.ri_cb = NULL;
@ -202,17 +197,6 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
}
}
#endif /* CONFIG_64BIT */
/* start new process with ar4 pointing to the correct address space */
p->thread.mm_segment = get_fs();
/* Don't copy debug registers */
memset(&p->thread.per_user, 0, sizeof(p->thread.per_user));
memset(&p->thread.per_event, 0, sizeof(p->thread.per_event));
clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
clear_tsk_thread_flag(p, TIF_PER_TRAP);
/* Initialize per thread user and system timer values */
ti = task_thread_info(p);
ti->user_timer = 0;
ti->system_timer = 0;
return 0;
}
@ -257,31 +241,6 @@ asmlinkage void execve_tail(void)
asm volatile("sfpc %0,%0" : : "d" (0));
}
/*
* sys_execve() executes a new program.
*/
SYSCALL_DEFINE3(execve, const char __user *, name,
const char __user *const __user *, argv,
const char __user *const __user *, envp)
{
struct pt_regs *regs = task_pt_regs(current);
char *filename;
long rc;
filename = getname(name);
rc = PTR_ERR(filename);
if (IS_ERR(filename))
return rc;
rc = do_execve(filename, argv, envp, regs);
if (rc)
goto out;
execve_tail();
rc = regs->gprs[2];
out:
putname(filename);
return rc;
}
/*
* fill in the FPU structure for a core dump.
*/

1
arch/sh/include/asm/Kbuild
View file

@ -7,6 +7,7 @@ generic-y += delay.h
generic-y += div64.h
generic-y += emergency-restart.h
generic-y += errno.h
generic-y += exec.h
generic-y += fcntl.h
generic-y += ioctl.h
generic-y += ipcbuf.h

10
arch/sh/include/asm/exec.h
View file

@ -1,10 +0,0 @@
/*
* Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
* Copyright (C) 2002 Paul Mundt
*/
#ifndef __ASM_SH_EXEC_H
#define __ASM_SH_EXEC_H
#define arch_align_stack(x) (x)
#endif /* __ASM_SH_EXEC_H */

1
arch/sparc/include/asm/Kbuild
View file

@ -3,6 +3,7 @@
generic-y += clkdev.h
generic-y += div64.h
generic-y += exec.h
generic-y += local64.h
generic-y += irq_regs.h
generic-y += local.h

6
arch/sparc/include/asm/exec.h
View file

@ -1,6 +0,0 @@
#ifndef __SPARC_EXEC_H
#define __SPARC_EXEC_H
#define arch_align_stack(x) (x)
#endif /* __SPARC_EXEC_H */

1
arch/tile/include/asm/Kbuild
View file

@ -13,6 +13,7 @@ generic-y += cputime.h
generic-y += div64.h
generic-y += emergency-restart.h
generic-y += errno.h
generic-y += exec.h
generic-y += fb.h
generic-y += fcntl.h
generic-y += ioctl.h

20
arch/tile/include/asm/exec.h
View file

@ -1,20 +0,0 @@
/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
#ifndef _ASM_TILE_EXEC_H
#define _ASM_TILE_EXEC_H
#define arch_align_stack(x) (x)
#endif /* _ASM_TILE_EXEC_H */

2
arch/um/include/asm/processor-generic.h
View file

@ -63,8 +63,6 @@ static inline void release_thread(struct task_struct *task)
{
}
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
extern unsigned long thread_saved_pc(struct task_struct *t);
static inline void mm_copy_segments(struct mm_struct *from_mm,

25
arch/um/kernel/exec.c
View file

@ -16,7 +16,6 @@
#include <mem_user.h>
#include <skas.h>
#include <os.h>
#include "internal.h"
void flush_thread(void)
{
@ -49,27 +48,7 @@ void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
}
EXPORT_SYMBOL(start_thread);
long um_execve(const char *file, const char __user *const __user *argv, const char __user *const __user *env)
void __noreturn ret_from_kernel_execve(struct pt_regs *unused)
{
long err;
err = do_execve(file, argv, env, &current->thread.regs);
if (!err)
UML_LONGJMP(current->thread.exec_buf, 1);
return err;
}
long sys_execve(const char __user *file, const char __user *const __user *argv,
const char __user *const __user *env)
{
long error;
char *filename;
filename = getname(file);
error = PTR_ERR(filename);
if (IS_ERR(filename)) goto out;
error = do_execve(filename, argv, env, &current->thread.regs);
putname(filename);
out:
return error;
UML_LONGJMP(current->thread.exec_buf, 1);
}

1
arch/um/kernel/internal.h
View file

@ -1 +0,0 @@
extern long um_execve(const char *file, const char __user *const __user *argv, const char __user *const __user *env);

17
arch/um/kernel/process.c
View file

@ -69,18 +69,6 @@ unsigned long alloc_stack(int order, int atomic)
return page;
}
int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
int pid;
current->thread.request.u.thread.proc = fn;
current->thread.request.u.thread.arg = arg;
pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0,
&current->thread.regs, 0, NULL, NULL);
return pid;
}
EXPORT_SYMBOL(kernel_thread);
static inline void set_current(struct task_struct *task)
{
cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
@ -177,7 +165,7 @@ void fork_handler(void)
}
int copy_thread(unsigned long clone_flags, unsigned long sp,
unsigned long stack_top, struct task_struct * p,
unsigned long arg, struct task_struct * p,
struct pt_regs *regs)
{
void (*handler)(void);
@ -198,7 +186,8 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
arch_copy_thread(&current->thread.arch, &p->thread.arch);
} else {
get_safe_registers(p->thread.regs.regs.gp, p->thread.regs.regs.fp);
p->thread.request.u.thread = current->thread.request.u.thread;
p->thread.request.u.thread.proc = (int (*)(void *))sp;
p->thread.request.u.thread.arg = (void *)arg;
handler = new_thread_handler;
}

17
arch/um/kernel/syscall.c
View file

@ -13,7 +13,6 @@
#include <asm/mman.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include "internal.h"
long sys_fork(void)
{
@ -50,19 +49,3 @@ long old_mmap(unsigned long addr, unsigned long len,
out:
return err;
}
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
mm_segment_t fs;
int ret;
fs = get_fs();
set_fs(KERNEL_DS);
ret = um_execve(filename, (const char __user *const __user *)argv,
(const char __user *const __user *) envp);
set_fs(fs);
return ret;
}

1
arch/unicore32/include/asm/Kbuild
View file

@ -11,6 +11,7 @@ generic-y += device.h
generic-y += div64.h
generic-y += emergency-restart.h
generic-y += errno.h
generic-y += exec.h
generic-y += fb.h
generic-y += fcntl.h
generic-y += ftrace.h

15
arch/unicore32/include/asm/exec.h
View file

@ -1,15 +0,0 @@
/*
* Process execution bits for PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2012 GUAN Xue-tao
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __UNICORE_EXEC_H__
#define __UNICORE_EXEC_H__
#define arch_align_stack(x) (x)
#endif /* __UNICORE_EXEC_H__ */

1
arch/unicore32/kernel/sys.c
View file

@ -104,7 +104,6 @@ int kernel_execve(const char *filename,
out:
return ret;
}
EXPORT_SYMBOL(kernel_execve);
/* Note: used by the compat code even in 64-bit Linux. */
SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,

1
arch/x86/Kconfig
View file

@ -108,6 +108,7 @@ config X86
select GENERIC_STRNLEN_USER
select HAVE_RCU_USER_QS if X86_64
select HAVE_IRQ_TIME_ACCOUNTING
select GENERIC_KERNEL_THREAD
config INSTRUCTION_DECODER
def_bool y

2
arch/x86/ia32/ia32entry.S
View file

@ -465,7 +465,7 @@ GLOBAL(\label)
PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn, %rdi
PTREGSCALL stub32_sigreturn, sys32_sigreturn, %rdi
PTREGSCALL stub32_sigaltstack, sys32_sigaltstack, %rdx
PTREGSCALL stub32_execve, sys32_execve, %rcx
PTREGSCALL stub32_execve, compat_sys_execve, %rcx
PTREGSCALL stub32_fork, sys_fork, %rdi
PTREGSCALL stub32_clone, sys32_clone, %rdx
PTREGSCALL stub32_vfork, sys_vfork, %rdi

15
arch/x86/ia32/sys_ia32.c
View file

@ -385,21 +385,6 @@ asmlinkage long sys32_sendfile(int out_fd, int in_fd,
return ret;
}
asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
compat_uptr_t __user *envp, struct pt_regs *regs)
{
long error;
char *filename;
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = compat_do_execve(filename, argv, envp, regs);
putname(filename);
return error;
}
asmlinkage long sys32_clone(unsigned int clone_flags, unsigned int newsp,
struct pt_regs *regs)
{

5
arch/x86/include/asm/processor.h
View file

@ -588,11 +588,6 @@ typedef struct {
} mm_segment_t;
/*
* create a kernel thread without removing it from tasklists
*/
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);

2
arch/x86/include/asm/sys_ia32.h
View file

@ -54,8 +54,6 @@ asmlinkage long sys32_pwrite(unsigned int, const char __user *, u32, u32, u32);
asmlinkage long sys32_personality(unsigned long);
asmlinkage long sys32_sendfile(int, int, compat_off_t __user *, s32);
asmlinkage long sys32_execve(const char __user *, compat_uptr_t __user *,
compat_uptr_t __user *, struct pt_regs *);
asmlinkage long sys32_clone(unsigned int, unsigned int, struct pt_regs *);
long sys32_lseek(unsigned int, int, unsigned int);

2
arch/x86/include/asm/syscalls.h
View file

@ -25,7 +25,7 @@ int sys_fork(struct pt_regs *);
int sys_vfork(struct pt_regs *);
long sys_execve(const char __user *,
const char __user *const __user *,
const char __user *const __user *, struct pt_regs *);
const char __user *const __user *);
long sys_clone(unsigned long, unsigned long, void __user *,
void __user *, struct pt_regs *);

2
arch/x86/include/asm/thread_info.h
View file

@ -79,7 +79,6 @@ struct thread_info {
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/
#define TIF_IRET 5 /* force IRET */
#define TIF_SYSCALL_EMU 6 /* syscall emulation active */
#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
#define TIF_SECCOMP 8 /* secure computing */
@ -105,7 +104,6 @@ struct thread_info {
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
#define _TIF_IRET (1 << TIF_IRET)
#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP (1 << TIF_SECCOMP)

2
arch/x86/include/asm/unistd.h
View file

@ -50,6 +50,8 @@
# define __ARCH_WANT_SYS_TIME
# define __ARCH_WANT_SYS_UTIME
# define __ARCH_WANT_SYS_WAITPID
# define __ARCH_WANT_SYS_EXECVE
# define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls

2
arch/x86/kernel/Makefile
View file

@ -23,7 +23,7 @@ obj-y += time.o ioport.o ldt.o dumpstack.o nmi.o
obj-y += setup.o x86_init.o i8259.o irqinit.o jump_label.o
obj-$(CONFIG_IRQ_WORK) += irq_work.o
obj-y += probe_roms.o
obj-$(CONFIG_X86_32) += sys_i386_32.o i386_ksyms_32.o
obj-$(CONFIG_X86_32) += i386_ksyms_32.o
obj-$(CONFIG_X86_64) += sys_x86_64.o x8664_ksyms_64.o
obj-y += syscall_$(BITS).o
obj-$(CONFIG_X86_64) += vsyscall_64.o

3
arch/x86/kernel/asm-offsets.c
View file

@ -69,4 +69,7 @@ void common(void) {
OFFSET(BP_kernel_alignment, boot_params, hdr.kernel_alignment);
OFFSET(BP_pref_address, boot_params, hdr.pref_address);
OFFSET(BP_code32_start, boot_params, hdr.code32_start);
BLANK();
DEFINE(PTREGS_SIZE, sizeof(struct pt_regs));
}

26
arch/x86/kernel/entry_32.S
View file

@ -299,6 +299,13 @@ ENTRY(ret_from_fork)
CFI_ENDPROC
END(ret_from_fork)
ENTRY(ret_from_kernel_execve)
movl %eax, %esp
movl $0,PT_EAX(%esp)
GET_THREAD_INFO(%ebp)
jmp syscall_exit
END(ret_from_kernel_execve)
/*
* Interrupt exit functions should be protected against kprobes
*/
@ -323,8 +330,7 @@ ret_from_intr:
andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax
#else
/*
* We can be coming here from a syscall done in the kernel space,
* e.g. a failed kernel_execve().
* We can be coming here from child spawned by kernel_thread().
*/
movl PT_CS(%esp), %eax
andl $SEGMENT_RPL_MASK, %eax
@ -732,7 +738,6 @@ ENDPROC(ptregs_##name)
PTREGSCALL1(iopl)
PTREGSCALL0(fork)
PTREGSCALL0(vfork)
PTREGSCALL3(execve)
PTREGSCALL2(sigaltstack)
PTREGSCALL0(sigreturn)
PTREGSCALL0(rt_sigreturn)
@ -1015,15 +1020,20 @@ END(spurious_interrupt_bug)
*/
.popsection
ENTRY(kernel_thread_helper)
pushl $0 # fake return address for unwinder
ENTRY(ret_from_kernel_thread)
CFI_STARTPROC
movl %edi,%eax
call *%esi
pushl_cfi %eax
call schedule_tail
GET_THREAD_INFO(%ebp)
popl_cfi %eax
pushl_cfi $0x0202 # Reset kernel eflags
popfl_cfi
movl PT_EBP(%esp),%eax
call *PT_EBX(%esp)
call do_exit
ud2 # padding for call trace
CFI_ENDPROC
ENDPROC(kernel_thread_helper)
ENDPROC(ret_from_kernel_thread)
#ifdef CONFIG_XEN
/* Xen doesn't set %esp to be precisely what the normal sysenter

74
arch/x86/kernel/entry_64.S
View file

@ -554,7 +554,7 @@ ENTRY(ret_from_fork)
RESTORE_REST
testl $3, CS-ARGOFFSET(%rsp) # from kernel_thread?
jz retint_restore_args
jz 1f
testl $_TIF_IA32, TI_flags(%rcx) # 32-bit compat task needs IRET
jnz int_ret_from_sys_call
@ -562,6 +562,16 @@ ENTRY(ret_from_fork)
RESTORE_TOP_OF_STACK %rdi, -ARGOFFSET
jmp ret_from_sys_call # go to the SYSRET fastpath
1:
subq $REST_SKIP, %rsp # move the stack pointer back
CFI_ADJUST_CFA_OFFSET REST_SKIP
movq %rbp, %rdi
call *%rbx
# exit
mov %eax, %edi
call do_exit
ud2 # padding for call trace
CFI_ENDPROC
END(ret_from_fork)
@ -862,7 +872,6 @@ ENTRY(stub_execve)
PARTIAL_FRAME 0
SAVE_REST
FIXUP_TOP_OF_STACK %r11
movq %rsp, %rcx
call sys_execve
RESTORE_TOP_OF_STACK %r11
movq %rax,RAX(%rsp)
@ -912,8 +921,7 @@ ENTRY(stub_x32_execve)
PARTIAL_FRAME 0
SAVE_REST
FIXUP_TOP_OF_STACK %r11
movq %rsp, %rcx
call sys32_execve
call compat_sys_execve
RESTORE_TOP_OF_STACK %r11
movq %rax,RAX(%rsp)
RESTORE_REST
@ -1318,51 +1326,19 @@ bad_gs:
jmp 2b
.previous
ENTRY(kernel_thread_helper)
pushq $0 # fake return address
CFI_STARTPROC
/*
* Here we are in the child and the registers are set as they were
* at kernel_thread() invocation in the parent.
*/
call *%rsi
# exit
mov %eax, %edi
call do_exit
ud2 # padding for call trace
CFI_ENDPROC
END(kernel_thread_helper)
/*
* execve(). This function needs to use IRET, not SYSRET, to set up all state properly.
*
* C extern interface:
* extern long execve(const char *name, char **argv, char **envp)
*
* asm input arguments:
* rdi: name, rsi: argv, rdx: envp
*
* We want to fallback into:
* extern long sys_execve(const char *name, char **argv,char **envp, struct pt_regs *regs)
*
* do_sys_execve asm fallback arguments:
* rdi: name, rsi: argv, rdx: envp, rcx: fake frame on the stack
*/
ENTRY(kernel_execve)
CFI_STARTPROC
FAKE_STACK_FRAME $0
SAVE_ALL
movq %rsp,%rcx
call sys_execve
movq %rax, RAX(%rsp)
RESTORE_REST
testq %rax,%rax
je int_ret_from_sys_call
RESTORE_ARGS
UNFAKE_STACK_FRAME
ret
CFI_ENDPROC
END(kernel_execve)
ENTRY(ret_from_kernel_execve)
movq %rdi, %rsp
movl $0, RAX(%rsp)
// RESTORE_REST
movq 0*8(%rsp), %r15
movq 1*8(%rsp), %r14
movq 2*8(%rsp), %r13
movq 3*8(%rsp), %r12
movq 4*8(%rsp), %rbp
movq 5*8(%rsp), %rbx
addq $(6*8), %rsp
jmp int_ret_from_sys_call
END(ret_from_kernel_execve)
/* Call softirq on interrupt stack. Interrupts are off. */
ENTRY(call_softirq)

65
arch/x86/kernel/process.c
View file

@ -292,71 +292,6 @@ sys_clone(unsigned long clone_flags, unsigned long newsp,
return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
}
/*
* This gets run with %si containing the
* function to call, and %di containing
* the "args".
*/
extern void kernel_thread_helper(void);
/*
* Create a kernel thread
*/
int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.si = (unsigned long) fn;
regs.di = (unsigned long) arg;
#ifdef CONFIG_X86_32
regs.ds = __USER_DS;
regs.es = __USER_DS;
regs.fs = __KERNEL_PERCPU;
regs.gs = __KERNEL_STACK_CANARY;
#else
regs.ss = __KERNEL_DS;
#endif
regs.orig_ax = -1;
regs.ip = (unsigned long) kernel_thread_helper;
regs.cs = __KERNEL_CS | get_kernel_rpl();
regs.flags = X86_EFLAGS_IF | X86_EFLAGS_BIT1;
/* Ok, create the new process.. */
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);
/*
* sys_execve() executes a new program.
*/
long sys_execve(const char __user *name,
const char __user *const __user *argv,
const char __user *const __user *envp, struct pt_regs *regs)
{
long error;
char *filename;
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = do_execve(filename, argv, envp, regs);
#ifdef CONFIG_X86_32
if (error == 0) {
/* Make sure we don't return using sysenter.. */
set_thread_flag(TIF_IRET);
}
#endif
putname(filename);
return error;
}
/*
* Idle related variables and functions
*/

39
arch/x86/kernel/process_32.c
View file

@ -57,6 +57,7 @@
#include <asm/switch_to.h>
asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
asmlinkage void ret_from_kernel_thread(void) __asm__("ret_from_kernel_thread");
/*
* Return saved PC of a blocked thread.
@ -127,23 +128,39 @@ void release_thread(struct task_struct *dead_task)
}
int copy_thread(unsigned long clone_flags, unsigned long sp,
unsigned long unused,
unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs;
struct pt_regs *childregs = task_pt_regs(p);
struct task_struct *tsk;
int err;
childregs = task_pt_regs(p);
*childregs = *regs;
childregs->ax = 0;
childregs->sp = sp;
p->thread.sp = (unsigned long) childregs;
p->thread.sp0 = (unsigned long) (childregs+1);
p->thread.ip = (unsigned long) ret_from_fork;
if (unlikely(!regs)) {
/* kernel thread */
memset(childregs, 0, sizeof(struct pt_regs));
p->thread.ip = (unsigned long) ret_from_kernel_thread;
task_user_gs(p) = __KERNEL_STACK_CANARY;
childregs->ds = __USER_DS;
childregs->es = __USER_DS;
childregs->fs = __KERNEL_PERCPU;
childregs->bx = sp; /* function */
childregs->bp = arg;
childregs->orig_ax = -1;
childregs->cs = __KERNEL_CS | get_kernel_rpl();
childregs->flags = X86_EFLAGS_IF | X86_EFLAGS_BIT1;
p->fpu_counter = 0;
p->thread.io_bitmap_ptr = NULL;
memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
return 0;
}
*childregs = *regs;
childregs->ax = 0;
childregs->sp = sp;
p->thread.ip = (unsigned long) ret_from_fork;
task_user_gs(p) = get_user_gs(regs);
p->fpu_counter = 0;
@ -190,6 +207,12 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
regs->cs = __USER_CS;
regs->ip = new_ip;
regs->sp = new_sp;
regs->flags = X86_EFLAGS_IF;
/*
* force it to the iret return path by making it look as if there was
* some work pending.
*/
set_thread_flag(TIF_NOTIFY_RESUME);
}
EXPORT_SYMBOL_GPL(start_thread);

35
arch/x86/kernel/process_64.c
View file

@ -146,29 +146,18 @@ static inline u32 read_32bit_tls(struct task_struct *t, int tls)
}
int copy_thread(unsigned long clone_flags, unsigned long sp,
unsigned long unused,
unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
int err;
struct pt_regs *childregs;
struct task_struct *me = current;
childregs = ((struct pt_regs *)
(THREAD_SIZE + task_stack_page(p))) - 1;
*childregs = *regs;
childregs->ax = 0;
if (user_mode(regs))
childregs->sp = sp;
else
childregs->sp = (unsigned long)childregs;
p->thread.sp0 = (unsigned long)task_stack_page(p) + THREAD_SIZE;
childregs = task_pt_regs(p);
p->thread.sp = (unsigned long) childregs;
p->thread.sp0 = (unsigned long) (childregs+1);
p->thread.usersp = me->thread.usersp;
set_tsk_thread_flag(p, TIF_FORK);
p->fpu_counter = 0;
p->thread.io_bitmap_ptr = NULL;
@ -178,6 +167,24 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
p->thread.fs = p->thread.fsindex ? 0 : me->thread.fs;
savesegment(es, p->thread.es);
savesegment(ds, p->thread.ds);
memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
if (unlikely(!regs)) {
/* kernel thread */
memset(childregs, 0, sizeof(struct pt_regs));
childregs->sp = (unsigned long)childregs;
childregs->ss = __KERNEL_DS;
childregs->bx = sp; /* function */
childregs->bp = arg;
childregs->orig_ax = -1;
childregs->cs = __KERNEL_CS | get_kernel_rpl();
childregs->flags = X86_EFLAGS_IF | X86_EFLAGS_BIT1;
return 0;
}
*childregs = *regs;
childregs->ax = 0;
childregs->sp = sp;
err = -ENOMEM;
memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));

4
arch/x86/kernel/signal.c
View file

@ -840,10 +840,6 @@ do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
if (thread_info_flags & _TIF_USER_RETURN_NOTIFY)
fire_user_return_notifiers();
#ifdef CONFIG_X86_32
clear_thread_flag(TIF_IRET);
#endif /* CONFIG_X86_32 */
rcu_user_enter();
}

40
arch/x86/kernel/sys_i386_32.c
View file

@ -1,40 +0,0 @@
/*
* This file contains various random system calls that
* have a non-standard calling sequence on the Linux/i386
* platform.
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/utsname.h>
#include <linux/ipc.h>
#include <linux/uaccess.h>
#include <linux/unistd.h>
#include <asm/syscalls.h>
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
long __res;
asm volatile ("int $0x80"
: "=a" (__res)
: "0" (__NR_execve), "b" (filename), "c" (argv), "d" (envp) : "memory");
return __res;
}

6
arch/x86/kernel/vm86_32.c
View file

@ -561,9 +561,9 @@ int handle_vm86_trap(struct kernel_vm86_regs *regs, long error_code, int trapno)
if ((trapno == 3) || (trapno == 1)) {
KVM86->regs32->ax = VM86_TRAP + (trapno << 8);
/* setting this flag forces the code in entry_32.S to
call save_v86_state() and change the stack pointer
to KVM86->regs32 */
set_thread_flag(TIF_IRET);
the path where we call save_v86_state() and change
the stack pointer to KVM86->regs32 */
set_thread_flag(TIF_NOTIFY_RESUME);
return 0;
}
do_int(regs, trapno, (unsigned char __user *) (regs->pt.ss << 4), SP(regs));

2
arch/x86/syscalls/syscall_32.tbl
View file

@ -17,7 +17,7 @@
8 i386 creat sys_creat
9 i386 link sys_link
10 i386 unlink sys_unlink
11 i386 execve ptregs_execve stub32_execve
11 i386 execve sys_execve stub32_execve
12 i386 chdir sys_chdir
13 i386 time sys_time compat_sys_time
14 i386 mknod sys_mknod

1
arch/x86/um/Kconfig
View file

@ -13,6 +13,7 @@ endmenu
config UML_X86
def_bool y
select GENERIC_FIND_FIRST_BIT
select GENERIC_KERNEL_THREAD
config 64BIT
bool "64-bit kernel" if SUBARCH = "x86"

1
arch/x86/um/sys_call_table_32.c
View file

@ -25,7 +25,6 @@
#define old_mmap sys_old_mmap
#define ptregs_fork sys_fork
#define ptregs_execve sys_execve
#define ptregs_iopl sys_iopl
#define ptregs_vm86old sys_vm86old
#define ptregs_clone i386_clone

1
arch/xtensa/include/asm/Kbuild
View file

@ -1,3 +1,4 @@
include include/asm-generic/Kbuild.asm
generic-y += clkdev.h
generic-y += exec.h

14
arch/xtensa/include/asm/exec.h
View file

@ -1,14 +0,0 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2001 - 2005 Tensilica Inc.
*/
#ifndef _XTENSA_EXEC_H
#define _XTENSA_EXEC_H
#define arch_align_stack(x) (x)
#endif /* _XTENSA_EXEC_H */

1
fs/binfmt_elf.c
View file

@ -36,7 +36,6 @@
#include <asm/uaccess.h>
#include <asm/param.h>
#include <asm/page.h>
#include <asm/exec.h>
#ifndef user_long_t
#define user_long_t long

1
fs/binfmt_elf_fdpic.c
View file

@ -39,7 +39,6 @@
#include <asm/uaccess.h>
#include <asm/param.h>
#include <asm/pgalloc.h>
#include <asm/exec.h>
typedef char *elf_caddr_t;

61
fs/exec.c
View file

@ -59,7 +59,6 @@
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/tlb.h>
#include <asm/exec.h>
#include <trace/events/task.h>
#include "internal.h"
@ -392,7 +391,7 @@ struct user_arg_ptr {
union {
const char __user *const __user *native;
#ifdef CONFIG_COMPAT
compat_uptr_t __user *compat;
const compat_uptr_t __user *compat;
#endif
} ptr;
};
@ -1574,9 +1573,9 @@ int do_execve(const char *filename,
}
#ifdef CONFIG_COMPAT
int compat_do_execve(char *filename,
compat_uptr_t __user *__argv,
compat_uptr_t __user *__envp,
int compat_do_execve(const char *filename,
const compat_uptr_t __user *__argv,
const compat_uptr_t __user *__envp,
struct pt_regs *regs)
{
struct user_arg_ptr argv = {
@ -1658,3 +1657,55 @@ int get_dumpable(struct mm_struct *mm)
{
return __get_dumpable(mm->flags);
}
#ifdef __ARCH_WANT_SYS_EXECVE
SYSCALL_DEFINE3(execve,
const char __user *, filename,
const char __user *const __user *, argv,
const char __user *const __user *, envp)
{
const char *path = getname(filename);
int error = PTR_ERR(path);
if (!IS_ERR(path)) {
error = do_execve(path, argv, envp, current_pt_regs());
putname(path);
}
return error;
}
#ifdef CONFIG_COMPAT
asmlinkage long compat_sys_execve(const char __user * filename,
const compat_uptr_t __user * argv,
const compat_uptr_t __user * envp)
{
const char *path = getname(filename);
int error = PTR_ERR(path);
if (!IS_ERR(path)) {
error = compat_do_execve(path, argv, envp, current_pt_regs());
putname(path);
}
return error;
}
#endif
#endif
#ifdef __ARCH_WANT_KERNEL_EXECVE
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
struct pt_regs *p = current_pt_regs();
int ret;
ret = do_execve(filename,
(const char __user *const __user *)argv,
(const char __user *const __user *)envp, p);
if (ret < 0)
return ret;
/*
* We were successful. We won't be returning to our caller, but
* instead to user space by manipulating the kernel stack.
*/
ret_from_kernel_execve(p);
}
#endif

6
include/linux/binfmts.h
View file

@ -19,6 +19,8 @@ struct pt_regs;
#ifdef __KERNEL__
#include <linux/sched.h>
#include <linux/unistd.h>
#include <asm/exec.h>
#define CORENAME_MAX_SIZE 128
@ -135,5 +137,9 @@ extern void install_exec_creds(struct linux_binprm *bprm);
extern void set_binfmt(struct linux_binfmt *new);
extern void free_bprm(struct linux_binprm *);
#ifdef __ARCH_WANT_KERNEL_EXECVE
extern void ret_from_kernel_execve(struct pt_regs *normal) __noreturn;
#endif
#endif /* __KERNEL__ */
#endif /* _LINUX_BINFMTS_H */

8
include/linux/compat.h
View file

@ -284,8 +284,12 @@ asmlinkage ssize_t compat_sys_pwritev(unsigned long fd,
const struct compat_iovec __user *vec,
unsigned long vlen, u32 pos_low, u32 pos_high);
int compat_do_execve(char *filename, compat_uptr_t __user *argv,
compat_uptr_t __user *envp, struct pt_regs *regs);
int compat_do_execve(const char *filename, const compat_uptr_t __user *argv,
const compat_uptr_t __user *envp, struct pt_regs *regs);
#ifdef __ARCH_WANT_SYS_EXECVE
asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
const compat_uptr_t __user *envp);
#endif
asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
compat_ulong_t __user *outp, compat_ulong_t __user *exp,

4
include/linux/ptrace.h
View file

@ -401,6 +401,10 @@ static inline void user_single_step_siginfo(struct task_struct *tsk,
#define arch_ptrace_stop(code, info) do { } while (0)
#endif
#ifndef current_pt_regs
#define current_pt_regs() task_pt_regs(current)
#endif
extern int task_current_syscall(struct task_struct *target, long *callno,
unsigned long args[6], unsigned int maxargs,
unsigned long *sp, unsigned long *pc);

3
include/linux/sched.h
View file

@ -2332,6 +2332,9 @@ extern int do_execve(const char *,
const char __user * const __user *, struct pt_regs *);
extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
struct task_struct *fork_idle(int);
#ifdef CONFIG_GENERIC_KERNEL_THREAD
extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
#endif
extern void set_task_comm(struct task_struct *tsk, char *from);
extern char *get_task_comm(char *to, struct task_struct *tsk);

13
kernel/fork.c
View file

@ -1584,7 +1584,7 @@ long do_fork(unsigned long clone_flags,
* requested, no event is reported; otherwise, report if the event
* for the type of forking is enabled.
*/
if (likely(user_mode(regs)) && !(clone_flags & CLONE_UNTRACED)) {
if (!(clone_flags & CLONE_UNTRACED) && likely(user_mode(regs))) {
if (clone_flags & CLONE_VFORK)
trace = PTRACE_EVENT_VFORK;
else if ((clone_flags & CSIGNAL) != SIGCHLD)
@ -1634,6 +1634,17 @@ long do_fork(unsigned long clone_flags,
return nr;
}
#ifdef CONFIG_GENERIC_KERNEL_THREAD
/*
* Create a kernel thread.
*/
pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, (unsigned long)fn, NULL,
(unsigned long)arg, NULL, NULL);
}
#endif
#ifndef ARCH_MIN_MMSTRUCT_ALIGN
#define ARCH_MIN_MMSTRUCT_ALIGN 0
#endif