47c51dff4a
Also PTRACE_OLDSETOPTIONS should be accepted, as done by kernel/ptrace.c
and forced by binary compatibility. UML/32bit breaks because of this -
since it is wise enough to use PTRACE_OLDSETOPTIONS to be binary compatible
with 2.4 host kernels.
Until 2.6.17 (commit f0f2d6536e) we had:
default:
return sys_ptrace(request, pid, addr, data);
Instead here we have:
case PTRACE_GET_THREAD_AREA:
case ...:
return sys_ptrace(request, pid, addr, data);
default:
return -EINVAL;
This change was a style change - when a case is added, it must be
explicitly tested this way. In this case, not enough testing was done.
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
403 lines
9.4 KiB
C
403 lines
9.4 KiB
C
/*
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* 32bit ptrace for x86-64.
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*
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* Copyright 2001,2002 Andi Kleen, SuSE Labs.
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* Some parts copied from arch/i386/kernel/ptrace.c. See that file for earlier
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* copyright.
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*
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* This allows to access 64bit processes too; but there is no way to see the extended
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* register contents.
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*/
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#include <linux/kernel.h>
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#include <linux/stddef.h>
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#include <linux/sched.h>
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#include <linux/syscalls.h>
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#include <linux/unistd.h>
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#include <linux/mm.h>
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#include <linux/ptrace.h>
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#include <asm/ptrace.h>
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#include <asm/compat.h>
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#include <asm/uaccess.h>
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#include <asm/user32.h>
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#include <asm/user.h>
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#include <asm/errno.h>
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#include <asm/debugreg.h>
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#include <asm/i387.h>
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#include <asm/fpu32.h>
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#include <asm/ia32.h>
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/*
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* Determines which flags the user has access to [1 = access, 0 = no access].
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* Prohibits changing ID(21), VIP(20), VIF(19), VM(17), IOPL(12-13), IF(9).
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* Also masks reserved bits (31-22, 15, 5, 3, 1).
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*/
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#define FLAG_MASK 0x54dd5UL
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#define R32(l,q) \
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case offsetof(struct user32, regs.l): stack[offsetof(struct pt_regs, q)/8] = val; break
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static int putreg32(struct task_struct *child, unsigned regno, u32 val)
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{
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int i;
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__u64 *stack = (__u64 *)task_pt_regs(child);
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switch (regno) {
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case offsetof(struct user32, regs.fs):
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if (val && (val & 3) != 3) return -EIO;
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child->thread.fsindex = val & 0xffff;
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break;
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case offsetof(struct user32, regs.gs):
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if (val && (val & 3) != 3) return -EIO;
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child->thread.gsindex = val & 0xffff;
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break;
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case offsetof(struct user32, regs.ds):
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if (val && (val & 3) != 3) return -EIO;
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child->thread.ds = val & 0xffff;
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break;
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case offsetof(struct user32, regs.es):
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child->thread.es = val & 0xffff;
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break;
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case offsetof(struct user32, regs.ss):
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if ((val & 3) != 3) return -EIO;
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stack[offsetof(struct pt_regs, ss)/8] = val & 0xffff;
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break;
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case offsetof(struct user32, regs.cs):
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if ((val & 3) != 3) return -EIO;
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stack[offsetof(struct pt_regs, cs)/8] = val & 0xffff;
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break;
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R32(ebx, rbx);
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R32(ecx, rcx);
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R32(edx, rdx);
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R32(edi, rdi);
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R32(esi, rsi);
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R32(ebp, rbp);
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R32(eax, rax);
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R32(orig_eax, orig_rax);
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R32(eip, rip);
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R32(esp, rsp);
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case offsetof(struct user32, regs.eflags): {
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__u64 *flags = &stack[offsetof(struct pt_regs, eflags)/8];
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val &= FLAG_MASK;
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*flags = val | (*flags & ~FLAG_MASK);
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break;
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}
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case offsetof(struct user32, u_debugreg[4]):
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case offsetof(struct user32, u_debugreg[5]):
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return -EIO;
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case offsetof(struct user32, u_debugreg[0]):
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child->thread.debugreg0 = val;
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break;
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case offsetof(struct user32, u_debugreg[1]):
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child->thread.debugreg1 = val;
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break;
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case offsetof(struct user32, u_debugreg[2]):
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child->thread.debugreg2 = val;
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break;
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case offsetof(struct user32, u_debugreg[3]):
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child->thread.debugreg3 = val;
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break;
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case offsetof(struct user32, u_debugreg[6]):
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child->thread.debugreg6 = val;
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break;
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case offsetof(struct user32, u_debugreg[7]):
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val &= ~DR_CONTROL_RESERVED;
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/* See arch/i386/kernel/ptrace.c for an explanation of
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* this awkward check.*/
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for(i=0; i<4; i++)
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if ((0x5454 >> ((val >> (16 + 4*i)) & 0xf)) & 1)
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return -EIO;
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child->thread.debugreg7 = val;
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if (val)
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set_tsk_thread_flag(child, TIF_DEBUG);
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else
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clear_tsk_thread_flag(child, TIF_DEBUG);
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break;
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default:
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if (regno > sizeof(struct user32) || (regno & 3))
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return -EIO;
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/* Other dummy fields in the virtual user structure are ignored */
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break;
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}
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return 0;
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}
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#undef R32
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#define R32(l,q) \
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case offsetof(struct user32, regs.l): *val = stack[offsetof(struct pt_regs, q)/8]; break
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static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
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{
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__u64 *stack = (__u64 *)task_pt_regs(child);
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switch (regno) {
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case offsetof(struct user32, regs.fs):
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*val = child->thread.fsindex;
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break;
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case offsetof(struct user32, regs.gs):
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*val = child->thread.gsindex;
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break;
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case offsetof(struct user32, regs.ds):
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*val = child->thread.ds;
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break;
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case offsetof(struct user32, regs.es):
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*val = child->thread.es;
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break;
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R32(cs, cs);
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R32(ss, ss);
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R32(ebx, rbx);
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R32(ecx, rcx);
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R32(edx, rdx);
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R32(edi, rdi);
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R32(esi, rsi);
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R32(ebp, rbp);
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R32(eax, rax);
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R32(orig_eax, orig_rax);
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R32(eip, rip);
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R32(eflags, eflags);
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R32(esp, rsp);
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case offsetof(struct user32, u_debugreg[0]):
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*val = child->thread.debugreg0;
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break;
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case offsetof(struct user32, u_debugreg[1]):
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*val = child->thread.debugreg1;
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break;
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case offsetof(struct user32, u_debugreg[2]):
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*val = child->thread.debugreg2;
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break;
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case offsetof(struct user32, u_debugreg[3]):
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*val = child->thread.debugreg3;
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break;
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case offsetof(struct user32, u_debugreg[6]):
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*val = child->thread.debugreg6;
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break;
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case offsetof(struct user32, u_debugreg[7]):
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*val = child->thread.debugreg7;
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break;
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default:
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if (regno > sizeof(struct user32) || (regno & 3))
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return -EIO;
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/* Other dummy fields in the virtual user structure are ignored */
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*val = 0;
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break;
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}
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return 0;
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}
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#undef R32
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static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
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{
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int ret;
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compat_siginfo_t __user *si32 = compat_ptr(data);
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siginfo_t ssi;
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siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t));
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if (request == PTRACE_SETSIGINFO) {
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memset(&ssi, 0, sizeof(siginfo_t));
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ret = copy_siginfo_from_user32(&ssi, si32);
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if (ret)
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return ret;
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if (copy_to_user(si, &ssi, sizeof(siginfo_t)))
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return -EFAULT;
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}
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ret = sys_ptrace(request, pid, addr, (unsigned long)si);
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if (ret)
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return ret;
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if (request == PTRACE_GETSIGINFO) {
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if (copy_from_user(&ssi, si, sizeof(siginfo_t)))
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return -EFAULT;
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ret = copy_siginfo_to_user32(si32, &ssi);
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}
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return ret;
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}
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asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
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{
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struct task_struct *child;
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struct pt_regs *childregs;
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void __user *datap = compat_ptr(data);
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int ret;
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__u32 val;
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switch (request) {
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case PTRACE_TRACEME:
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case PTRACE_ATTACH:
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case PTRACE_KILL:
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case PTRACE_CONT:
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case PTRACE_SINGLESTEP:
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case PTRACE_DETACH:
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case PTRACE_SYSCALL:
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case PTRACE_OLDSETOPTIONS:
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case PTRACE_SETOPTIONS:
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case PTRACE_SET_THREAD_AREA:
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case PTRACE_GET_THREAD_AREA:
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return sys_ptrace(request, pid, addr, data);
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default:
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return -EINVAL;
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case PTRACE_PEEKTEXT:
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case PTRACE_PEEKDATA:
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case PTRACE_POKEDATA:
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case PTRACE_POKETEXT:
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case PTRACE_POKEUSR:
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case PTRACE_PEEKUSR:
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case PTRACE_GETREGS:
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case PTRACE_SETREGS:
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case PTRACE_SETFPREGS:
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case PTRACE_GETFPREGS:
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case PTRACE_SETFPXREGS:
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case PTRACE_GETFPXREGS:
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case PTRACE_GETEVENTMSG:
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break;
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case PTRACE_SETSIGINFO:
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case PTRACE_GETSIGINFO:
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return ptrace32_siginfo(request, pid, addr, data);
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}
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child = ptrace_get_task_struct(pid);
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if (IS_ERR(child))
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return PTR_ERR(child);
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ret = ptrace_check_attach(child, request == PTRACE_KILL);
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if (ret < 0)
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goto out;
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childregs = task_pt_regs(child);
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switch (request) {
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case PTRACE_PEEKDATA:
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case PTRACE_PEEKTEXT:
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ret = 0;
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if (access_process_vm(child, addr, &val, sizeof(u32), 0)!=sizeof(u32))
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ret = -EIO;
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else
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ret = put_user(val, (unsigned int __user *)datap);
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break;
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case PTRACE_POKEDATA:
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case PTRACE_POKETEXT:
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ret = 0;
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if (access_process_vm(child, addr, &data, sizeof(u32), 1)!=sizeof(u32))
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ret = -EIO;
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break;
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case PTRACE_PEEKUSR:
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ret = getreg32(child, addr, &val);
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if (ret == 0)
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ret = put_user(val, (__u32 __user *)datap);
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break;
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case PTRACE_POKEUSR:
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ret = putreg32(child, addr, data);
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break;
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case PTRACE_GETREGS: { /* Get all gp regs from the child. */
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int i;
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if (!access_ok(VERIFY_WRITE, datap, 16*4)) {
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ret = -EIO;
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break;
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}
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ret = 0;
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for ( i = 0; i <= 16*4 ; i += sizeof(__u32) ) {
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getreg32(child, i, &val);
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ret |= __put_user(val,(u32 __user *)datap);
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datap += sizeof(u32);
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}
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break;
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}
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case PTRACE_SETREGS: { /* Set all gp regs in the child. */
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unsigned long tmp;
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int i;
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if (!access_ok(VERIFY_READ, datap, 16*4)) {
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ret = -EIO;
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break;
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}
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ret = 0;
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for ( i = 0; i <= 16*4; i += sizeof(u32) ) {
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ret |= __get_user(tmp, (u32 __user *)datap);
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putreg32(child, i, tmp);
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datap += sizeof(u32);
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}
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break;
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}
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case PTRACE_GETFPREGS:
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ret = -EIO;
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if (!access_ok(VERIFY_READ, compat_ptr(data),
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sizeof(struct user_i387_struct)))
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break;
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save_i387_ia32(child, datap, childregs, 1);
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ret = 0;
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break;
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case PTRACE_SETFPREGS:
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ret = -EIO;
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if (!access_ok(VERIFY_WRITE, datap,
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sizeof(struct user_i387_struct)))
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break;
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ret = 0;
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/* don't check EFAULT to be bug-to-bug compatible to i386 */
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restore_i387_ia32(child, datap, 1);
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break;
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case PTRACE_GETFPXREGS: {
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struct user32_fxsr_struct __user *u = datap;
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init_fpu(child);
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ret = -EIO;
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if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
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break;
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ret = -EFAULT;
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if (__copy_to_user(u, &child->thread.i387.fxsave, sizeof(*u)))
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break;
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ret = __put_user(childregs->cs, &u->fcs);
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ret |= __put_user(child->thread.ds, &u->fos);
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break;
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}
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case PTRACE_SETFPXREGS: {
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struct user32_fxsr_struct __user *u = datap;
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unlazy_fpu(child);
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ret = -EIO;
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if (!access_ok(VERIFY_READ, u, sizeof(*u)))
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break;
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/* no checking to be bug-to-bug compatible with i386. */
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/* but silence warning */
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if (__copy_from_user(&child->thread.i387.fxsave, u, sizeof(*u)))
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;
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set_stopped_child_used_math(child);
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child->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
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ret = 0;
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break;
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}
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case PTRACE_GETEVENTMSG:
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ret = put_user(child->ptrace_message,(unsigned int __user *)compat_ptr(data));
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break;
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default:
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BUG();
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}
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out:
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put_task_struct(child);
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return ret;
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}
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