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authorMichal Hocko <mhocko@suse.com>2016-05-24 02:26:02 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-24 03:04:14 +0300
commitf268dfe905d4682150d4acbb25f59adc04cd9398 (patch)
treefe801df15a0b82af4ac665bfa92db7804c06f9b5 /fs
parent013373e8b86735086ac86aff782637f7e58ff84d (diff)
downloadlinux-f268dfe905d4682150d4acbb25f59adc04cd9398.tar.xz
exec: make exec path waiting for mmap_sem killable
setup_arg_pages requires mmap_sem for write. If the waiting task gets killed by the oom killer it would block oom_reaper from asynchronous address space reclaim and reduce the chances of timely OOM resolving. Wait for the lock in the killable mode and return with EINTR if the task got killed while waiting. All the callers are already handling error path and the fatal signal doesn't need any additional treatment. The same applies to __bprm_mm_init. Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/exec.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 4f079bd083af..887c1c955df8 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -263,7 +263,10 @@ static int __bprm_mm_init(struct linux_binprm *bprm)
if (!vma)
return -ENOMEM;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem)) {
+ err = -EINTR;
+ goto err_free;
+ }
vma->vm_mm = mm;
/*
@@ -290,6 +293,7 @@ static int __bprm_mm_init(struct linux_binprm *bprm)
return 0;
err:
up_write(&mm->mmap_sem);
+err_free:
bprm->vma = NULL;
kmem_cache_free(vm_area_cachep, vma);
return err;
@@ -696,7 +700,9 @@ int setup_arg_pages(struct linux_binprm *bprm,
bprm->loader -= stack_shift;
bprm->exec -= stack_shift;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
+
vm_flags = VM_STACK_FLAGS;
/*