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mm: use mm->exe_file instead of first VM_EXECUTABLE vma->vm_file

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Some security modules and oprofile still uses VM_EXECUTABLE for retrieving
a task's executable file.  After this patch they will use mm->exe_file
directly.  mm->exe_file is protected with mm->mmap_sem, so locking stays
the same.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: Chris Metcalf <cmetcalf@tilera.com>			[arch/tile]
Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>	[tomoyo]
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Carsten Otte <cotte@de.ibm.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Eric Paris <eparis@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Acked-by: James Morris <james.l.morris@oracle.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Kentaro Takeda <takedakn@nttdata.co.jp>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Venkatesh Pallipadi <venki@google.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Konstantin Khlebnikov 2012-10-08 16:28:51 -07:00 committed by Linus Torvalds
parent 0b173bc4da
commit 2dd8ad81e3
6 changed files with 19 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
arch/powerpc/oprofile/cell/spu_task_sync.c
View File

@ -304,7 +304,7 @@ static inline unsigned long fast_get_dcookie(struct path *path)
return cookie;
}
/* Look up the dcookie for the task's first VM_EXECUTABLE mapping,
/* Look up the dcookie for the task's mm->exe_file,
* which corresponds loosely to "application name". Also, determine
* the offset for the SPU ELF object. If computed offset is
* non-zero, it implies an embedded SPU object; otherwise, it's a
@ -321,7 +321,6 @@ get_exec_dcookie_and_offset(struct spu *spu, unsigned int *offsetp,
{
unsigned long app_cookie = 0;
unsigned int my_offset = 0;
struct file *app = NULL;
struct vm_area_struct *vma;
struct mm_struct *mm = spu->mm;
@ -330,16 +329,10 @@ get_exec_dcookie_and_offset(struct spu *spu, unsigned int *offsetp,
down_read(&mm->mmap_sem);
for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (!vma->vm_file)
continue;
if (!(vma->vm_flags & VM_EXECUTABLE))
continue;
app_cookie = fast_get_dcookie(&vma->vm_file->f_path);
if (mm->exe_file) {
app_cookie = fast_get_dcookie(&mm->exe_file->f_path);
pr_debug("got dcookie for %s\n",
vma->vm_file->f_dentry->d_name.name);
app = vma->vm_file;
break;
mm->exe_file->f_dentry->d_name.name);
}
for (vma = mm->mmap; vma; vma = vma->vm_next) {

19
arch/tile/mm/elf.c
View File

@ -36,19 +36,14 @@ static void sim_notify_exec(const char *binary_name)
} while (c);
}
static int notify_exec(void)
static int notify_exec(struct mm_struct *mm)
{
int retval = 0; /* failure */
struct vm_area_struct *vma = current->mm->mmap;
while (vma) {
if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file)
break;
vma = vma->vm_next;
}
if (vma) {
if (mm->exe_file) {
char *buf = (char *) __get_free_page(GFP_KERNEL);
if (buf) {
char *path = d_path(&vma->vm_file->f_path,
char *path = d_path(&mm->exe_file->f_path,
buf, PAGE_SIZE);
if (!IS_ERR(path)) {
sim_notify_exec(path);
@ -106,16 +101,16 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
unsigned long vdso_base;
int retval = 0;
down_write(&mm->mmap_sem);
/*
* Notify the simulator that an exec just occurred.
* If we can't find the filename of the mapping, just use
* whatever was passed as the linux_binprm filename.
*/
if (!notify_exec())
if (!notify_exec(mm))
sim_notify_exec(bprm->filename);
down_write(&mm->mmap_sem);
/*
* MAYWRITE to allow gdb to COW and set breakpoints
*/

17
drivers/oprofile/buffer_sync.c
View File

@ -216,7 +216,7 @@ static inline unsigned long fast_get_dcookie(struct path *path)
}
/* Look up the dcookie for the task's first VM_EXECUTABLE mapping,
/* Look up the dcookie for the task's mm->exe_file,
* which corresponds loosely to "application name". This is
* not strictly necessary but allows oprofile to associate
* shared-library samples with particular applications
@ -224,21 +224,10 @@ static inline unsigned long fast_get_dcookie(struct path *path)
static unsigned long get_exec_dcookie(struct mm_struct *mm)
{
unsigned long cookie = NO_COOKIE;
struct vm_area_struct *vma;
if (!mm)
goto out;
if (mm && mm->exe_file)
cookie = fast_get_dcookie(&mm->exe_file->f_path);
for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (!vma->vm_file)
continue;
if (!(vma->vm_flags & VM_EXECUTABLE))
continue;
cookie = fast_get_dcookie(&vma->vm_file->f_path);
break;
}
out:
return cookie;
}

13
kernel/auditsc.c
View File

@ -1151,7 +1151,6 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
const struct cred *cred;
char name[sizeof(tsk->comm)];
struct mm_struct *mm = tsk->mm;
struct vm_area_struct *vma;
char *tty;
if (!ab)
@ -1191,16 +1190,8 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
if (mm) {
down_read(&mm->mmap_sem);
vma = mm->mmap;
while (vma) {
if ((vma->vm_flags & VM_EXECUTABLE) &&
vma->vm_file) {
audit_log_d_path(ab, " exe=",
&vma->vm_file->f_path);
break;
}
vma = vma->vm_next;
}
if (mm->exe_file)
audit_log_d_path(ab, " exe=", &mm->exe_file->f_path);
up_read(&mm->mmap_sem);
}
audit_log_task_context(ab);

3
kernel/fork.c
View File

@ -656,8 +656,7 @@ struct file *get_mm_exe_file(struct mm_struct *mm)
{
struct file *exe_file;
/* We need mmap_sem to protect against races with removal of
* VM_EXECUTABLE vmas */
/* We need mmap_sem to protect against races with removal of exe_file */
down_read(&mm->mmap_sem);
exe_file = mm->exe_file;
if (exe_file)

9
security/tomoyo/util.c
View File

@ -949,18 +949,13 @@ bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
const char *tomoyo_get_exe(void)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
const char *cp = NULL;
if (!mm)
return NULL;
down_read(&mm->mmap_sem);
for (vma = mm->mmap; vma; vma = vma->vm_next) {
if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
break;
}
}
if (mm->exe_file)
cp = tomoyo_realpath_from_path(&mm->exe_file->f_path);
up_read(&mm->mmap_sem);
return cp;
}