91a27b2a75
getname() is intended to copy pathname strings from userspace into a kernel buffer. The result is just a string in kernel space. It would however be quite helpful to be able to attach some ancillary info to the string. For instance, we could attach some audit-related info to reduce the amount of audit-related processing needed. When auditing is enabled, we could also call getname() on the string more than once and not need to recopy it from userspace. This patchset converts the getname()/putname() interfaces to return a struct instead of a string. For now, the struct just tracks the string in kernel space and the original userland pointer for it. Later, we'll add other information to the struct as it becomes convenient. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/*
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* arch/score/kernel/syscall.c
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*
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* Score Processor version.
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*
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* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
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* Chen Liqin <liqin.chen@sunplusct.com>
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* Lennox Wu <lennox.wu@sunplusct.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/unistd.h>
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#include <linux/syscalls.h>
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#include <asm/syscalls.h>
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asmlinkage long
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sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
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unsigned long flags, unsigned long fd, unsigned long pgoff)
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{
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return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
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}
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asmlinkage long
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sys_mmap(unsigned long addr, unsigned long len, unsigned long prot,
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unsigned long flags, unsigned long fd, off_t offset)
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{
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if (unlikely(offset & ~PAGE_MASK))
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return -EINVAL;
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return sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
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}
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asmlinkage long
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score_fork(struct pt_regs *regs)
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{
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return do_fork(SIGCHLD, regs->regs[0], regs, 0, NULL, NULL);
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}
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/*
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* Clone a task - this clones the calling program thread.
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* This is called indirectly via a small wrapper
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*/
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asmlinkage long
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score_clone(struct pt_regs *regs)
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{
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unsigned long clone_flags;
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unsigned long newsp;
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int __user *parent_tidptr, *child_tidptr;
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clone_flags = regs->regs[4];
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newsp = regs->regs[5];
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if (!newsp)
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newsp = regs->regs[0];
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parent_tidptr = (int __user *)regs->regs[6];
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child_tidptr = (int __user *)regs->regs[8];
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return do_fork(clone_flags, newsp, regs, 0,
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parent_tidptr, child_tidptr);
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}
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asmlinkage long
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score_vfork(struct pt_regs *regs)
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{
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return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
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regs->regs[0], regs, 0, NULL, NULL);
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}
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/*
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* sys_execve() executes a new program.
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* This is called indirectly via a small wrapper
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*/
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asmlinkage long
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score_execve(struct pt_regs *regs)
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{
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int error;
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struct filename *filename;
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filename = getname((char __user*)regs->regs[4]);
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error = PTR_ERR(filename);
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if (IS_ERR(filename))
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return error;
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error = do_execve(filename->name,
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(const char __user *const __user *)regs->regs[5],
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(const char __user *const __user *)regs->regs[6],
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regs);
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putname(filename);
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return error;
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}
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/*
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* Do a system call from kernel instead of calling sys_execve so we
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* end up with proper pt_regs.
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*/
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asmlinkage
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int kernel_execve(const char *filename,
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const char *const argv[],
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const char *const envp[])
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{
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register unsigned long __r4 asm("r4") = (unsigned long) filename;
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register unsigned long __r5 asm("r5") = (unsigned long) argv;
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register unsigned long __r6 asm("r6") = (unsigned long) envp;
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register unsigned long __r7 asm("r7");
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__asm__ __volatile__ (" \n"
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"ldi r27, %5 \n"
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"syscall \n"
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"mv %0, r4 \n"
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"mv %1, r7 \n"
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: "=&r" (__r4), "=r" (__r7)
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: "r" (__r4), "r" (__r5), "r" (__r6), "i" (__NR_execve)
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: "r8", "r9", "r10", "r11", "r22", "r23", "r24", "r25",
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"r26", "r27", "memory");
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if (__r7 == 0)
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return __r4;
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return -__r4;
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}
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