diff options
| author | Junjiro R. Okajima <hooanon05@yahoo.co.jp> | 2008-12-02 10:31:46 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-26 14:27:09 -0700 |
| commit | c0ac27236d86f07e1b24126bd7ee0eeb9008eaaf (patch) | |
| tree | bfba51d2ad3f412fba9d71740e619145d6369972 | |
| parent | 3f955fe683ffdda7fd68e0b61779001cb9b50011 (diff) | |
nfsd: fix vm overcommit crash fix #2
commit 1b79cd04fab80be61dcd2732e2423aafde9a4c1c upstream.
The previous patch from Alan Cox ("nfsd: fix vm overcommit crash",
commit 731572d39fcd3498702eda4600db4c43d51e0b26) fixed the problem where
knfsd crashes on exported shmemfs objects and strict overcommit is set.
But the patch forgot supporting the case when CONFIG_SECURITY is
disabled.
This patch copies a part of his fix which is mainly for detecting a bug
earlier.
Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Junjiro R. Okajima <hooanon05@yahoo.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | include/linux/security.h | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/include/linux/security.h b/include/linux/security.h index afb426a5b5d0..0601e7157ee0 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -1823,17 +1823,21 @@ static inline int security_settime(struct timespec *ts, struct timezone *tz) static inline int security_vm_enough_memory(long pages) { + WARN_ON(current->mm == NULL); return cap_vm_enough_memory(current->mm, pages); } -static inline int security_vm_enough_memory_kern(long pages) +static inline int security_vm_enough_memory_mm(struct mm_struct *mm, long pages) { - return cap_vm_enough_memory(current->mm, pages); + WARN_ON(mm == NULL); + return cap_vm_enough_memory(mm, pages); } -static inline int security_vm_enough_memory_mm(struct mm_struct *mm, long pages) +static inline int security_vm_enough_memory_kern(long pages) { - return cap_vm_enough_memory(mm, pages); + /* If current->mm is a kernel thread then we will pass NULL, + for this specific case that is fine */ + return cap_vm_enough_memory(current->mm, pages); } static inline int security_bprm_alloc(struct linux_binprm *bprm) |