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authorKonstantin Khlebnikov <khlebnikov@openvz.org>2012-06-07 17:21:11 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-06-07 17:43:55 -0400
commitbafb282df29c1524b1617019adebd6d0c3eb7a47 (patch)
treef0b9efa850b4b298ce484eead5c8d9de87dde3e9 /include
parent6305902c2f871fd6db60af367bd7120fa977fa74 (diff)
c/r: prctl: update prctl_set_mm_exe_file() after mm->num_exe_file_vmas removal
A fix for commit b32dfe377102 ("c/r: prctl: add ability to set new mm_struct::exe_file"). After removing mm->num_exe_file_vmas kernel keeps mm->exe_file until final mmput(), it never becomes NULL while task is alive. We can check for other mapped files in mm instead of checking mm->num_exe_file_vmas, and mark mm with flag MMF_EXE_FILE_CHANGED in order to forbid second changing of mm->exe_file. Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Matt Helsley <matthltc@us.ibm.com> Cc: Kees Cook <keescook@chromium.org> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Tejun Heo <tj@kernel.org> Cc: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sched.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6029d8c54476..c688d4cc2e40 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -439,6 +439,7 @@ extern int get_dumpable(struct mm_struct *mm);
439 /* leave room for more dump flags */ 439 /* leave room for more dump flags */
440#define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ 440#define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
441#define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ 441#define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
442#define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
442 443
443#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) 444#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
444 445