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authorKonstantin Khlebnikov <khlebnikov@openvz.org>2012-10-08 16:28:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:18 +0900
commit2dd8ad81e31d0d36a5d448329c646ab43eb17788 (patch)
treecd358be45ed8067673edac7f1db6b6a42a96d9db /arch
parent0b173bc4daa8f8ec03a85abf5e47b23502ff80af (diff)
downloadlinux-2dd8ad81e31d0d36a5d448329c646ab43eb17788.tar.bz2
mm: use mm->exe_file instead of first VM_EXECUTABLE vma->vm_file
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/oprofile/cell/spu_task_sync.c15
-rw-r--r--arch/tile/mm/elf.c19
2 files changed, 11 insertions, 23 deletions
diff --git a/arch/powerpc/oprofile/cell/spu_task_sync.c b/arch/powerpc/oprofile/cell/spu_task_sync.c
index 642fca137ccb..28f1af2db1f5 100644
--- a/arch/powerpc/oprofile/cell/spu_task_sync.c
+++ b/arch/powerpc/oprofile/cell/spu_task_sync.c
@@ -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) {
diff --git a/arch/tile/mm/elf.c b/arch/tile/mm/elf.c
index 758b6038c2b7..3cfa98bf9125 100644
--- a/arch/tile/mm/elf.c
+++ b/arch/tile/mm/elf.c
@@ -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
*/