mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-11 04:54:13 +08:00
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>
145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
/*
|
|
* Based on arch/arm/kernel/sys_arm.c
|
|
*
|
|
* Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
|
|
* Copyright (C) 1995, 1996 Russell King.
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#define __SYSCALL_COMPAT
|
|
|
|
#include <linux/compat.h>
|
|
#include <linux/personality.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/unistd.h>
|
|
|
|
asmlinkage int compat_sys_fork(struct pt_regs *regs)
|
|
{
|
|
return do_fork(SIGCHLD, regs->compat_sp, regs, 0, NULL, NULL);
|
|
}
|
|
|
|
asmlinkage int compat_sys_clone(unsigned long clone_flags, unsigned long newsp,
|
|
int __user *parent_tidptr, int tls_val,
|
|
int __user *child_tidptr, struct pt_regs *regs)
|
|
{
|
|
if (!newsp)
|
|
newsp = regs->compat_sp;
|
|
|
|
return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
|
|
}
|
|
|
|
asmlinkage int compat_sys_vfork(struct pt_regs *regs)
|
|
{
|
|
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->compat_sp,
|
|
regs, 0, NULL, NULL);
|
|
}
|
|
|
|
asmlinkage int compat_sys_execve(const char __user *filenamei,
|
|
compat_uptr_t argv, compat_uptr_t envp,
|
|
struct pt_regs *regs)
|
|
{
|
|
int error;
|
|
struct filename *filename;
|
|
|
|
filename = getname(filenamei);
|
|
error = PTR_ERR(filename);
|
|
if (IS_ERR(filename))
|
|
goto out;
|
|
error = compat_do_execve(filename->name, compat_ptr(argv),
|
|
compat_ptr(envp), regs);
|
|
putname(filename);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid,
|
|
struct compat_timespec __user *interval)
|
|
{
|
|
struct timespec t;
|
|
int ret;
|
|
mm_segment_t old_fs = get_fs();
|
|
|
|
set_fs(KERNEL_DS);
|
|
ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
|
|
set_fs(old_fs);
|
|
if (put_compat_timespec(&t, interval))
|
|
return -EFAULT;
|
|
return ret;
|
|
}
|
|
|
|
static inline void
|
|
do_compat_cache_op(unsigned long start, unsigned long end, int flags)
|
|
{
|
|
struct mm_struct *mm = current->active_mm;
|
|
struct vm_area_struct *vma;
|
|
|
|
if (end < start || flags)
|
|
return;
|
|
|
|
down_read(&mm->mmap_sem);
|
|
vma = find_vma(mm, start);
|
|
if (vma && vma->vm_start < end) {
|
|
if (start < vma->vm_start)
|
|
start = vma->vm_start;
|
|
if (end > vma->vm_end)
|
|
end = vma->vm_end;
|
|
up_read(&mm->mmap_sem);
|
|
__flush_cache_user_range(start & PAGE_MASK, PAGE_ALIGN(end));
|
|
return;
|
|
}
|
|
up_read(&mm->mmap_sem);
|
|
}
|
|
|
|
/*
|
|
* Handle all unrecognised system calls.
|
|
*/
|
|
long compat_arm_syscall(struct pt_regs *regs)
|
|
{
|
|
unsigned int no = regs->regs[7];
|
|
|
|
switch (no) {
|
|
/*
|
|
* Flush a region from virtual address 'r0' to virtual address 'r1'
|
|
* _exclusive_. There is no alignment requirement on either address;
|
|
* user space does not need to know the hardware cache layout.
|
|
*
|
|
* r2 contains flags. It should ALWAYS be passed as ZERO until it
|
|
* is defined to be something else. For now we ignore it, but may
|
|
* the fires of hell burn in your belly if you break this rule. ;)
|
|
*
|
|
* (at a later date, we may want to allow this call to not flush
|
|
* various aspects of the cache. Passing '0' will guarantee that
|
|
* everything necessary gets flushed to maintain consistency in
|
|
* the specified region).
|
|
*/
|
|
case __ARM_NR_compat_cacheflush:
|
|
do_compat_cache_op(regs->regs[0], regs->regs[1], regs->regs[2]);
|
|
return 0;
|
|
|
|
case __ARM_NR_compat_set_tls:
|
|
current->thread.tp_value = regs->regs[0];
|
|
asm ("msr tpidrro_el0, %0" : : "r" (regs->regs[0]));
|
|
return 0;
|
|
|
|
default:
|
|
return -ENOSYS;
|
|
}
|
|
}
|