diff options
| author | Jiri Slaby <jslaby@suse.cz> | 2010-03-05 22:41:44 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-06 20:26:24 +0100 |
| commit | 59e99e5b9706867f18d4a36c1e4645fbaacbec2e (patch) | |
| tree | e977fb5eecccf1446296fd196072bd1287b0a92f /mm/mmap.c | |
| parent | mm: mlock_vma_pages_range() only return success or failure (diff) | |
| download | linux-59e99e5b9706867f18d4a36c1e4645fbaacbec2e.tar.xz linux-59e99e5b9706867f18d4a36c1e4645fbaacbec2e.zip | |
mm: use rlimit helpers
Make sure compiler won't do weird things with limits. E.g. fetching them
twice may return 2 different values after writable limits are implemented.
I.e. either use rlimit helpers added in
3e10e716abf3c71bdb5d86b8f507f9e72236c9cd ("resource: add helpers for
fetching rlimits") or ACCESS_ONCE if not applicable.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index c646618702cf..31656147128e 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -265,7 +265,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk) * segment grow beyond its set limit the in case where the limit is * not page aligned -Ram Gupta */ - rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur; + rlim = rlimit(RLIMIT_DATA); if (rlim < RLIM_INFINITY && (brk - mm->start_brk) + (mm->end_data - mm->start_data) > rlim) goto out; @@ -967,7 +967,7 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, unsigned long locked, lock_limit; locked = len >> PAGE_SHIFT; locked += mm->locked_vm; - lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur; + lock_limit = rlimit(RLIMIT_MEMLOCK); lock_limit >>= PAGE_SHIFT; if (locked > lock_limit && !capable(CAP_IPC_LOCK)) return -EAGAIN; @@ -1594,7 +1594,7 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns return -ENOMEM; /* Stack limit test */ - if (size > rlim[RLIMIT_STACK].rlim_cur) + if (size > ACCESS_ONCE(rlim[RLIMIT_STACK].rlim_cur)) return -ENOMEM; /* mlock limit tests */ @@ -1602,7 +1602,8 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns unsigned long locked; unsigned long limit; locked = mm->locked_vm + grow; - limit = rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT; + limit = ACCESS_ONCE(rlim[RLIMIT_MEMLOCK].rlim_cur); + limit >>= PAGE_SHIFT; if (locked > limit && !capable(CAP_IPC_LOCK)) return -ENOMEM; } @@ -2067,7 +2068,7 @@ unsigned long do_brk(unsigned long addr, unsigned long len) unsigned long locked, lock_limit; locked = len >> PAGE_SHIFT; locked += mm->locked_vm; - lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur; + lock_limit = rlimit(RLIMIT_MEMLOCK); lock_limit >>= PAGE_SHIFT; if (locked > lock_limit && !capable(CAP_IPC_LOCK)) return -EAGAIN; @@ -2281,7 +2282,7 @@ int may_expand_vm(struct mm_struct *mm, unsigned long npages) unsigned long cur = mm->total_vm; /* pages */ unsigned long lim; - lim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT; + lim = rlimit(RLIMIT_AS) >> PAGE_SHIFT; if (cur + npages > lim) return 0; |