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| author | Jiri Slaby <jslaby@suse.cz> | 2010-03-05 13:42:42 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-06 11:26:29 -0800 |
| commit | d554ed895dc8f293cc712c71f14b101ace82579a (patch) | |
| tree | fd29ba33d640e156e2ca4267ffbdb9dc566fd3d6 /fs/exec.c | |
| parent | 221e3ebf6d5f2625373573155924e39f196c5d3d (diff) | |
| download | lwn-d554ed895dc8f293cc712c71f14b101ace82579a.tar.gz lwn-d554ed895dc8f293cc712c71f14b101ace82579a.zip | |
fs: 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 commit 3e10e716abf3 ("resource:
add helpers for fetching rlimits") or ACCESS_ONCE if not applicable.
Signed-off-by: Jiri Slaby <jslaby@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/exec.c')
| -rw-r--r-- | fs/exec.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/exec.c b/fs/exec.c index 591030735591..6348d79401de 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -195,7 +195,7 @@ static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, * to work from. */ rlim = current->signal->rlim; - if (size > rlim[RLIMIT_STACK].rlim_cur / 4) { + if (size > ACCESS_ONCE(rlim[RLIMIT_STACK].rlim_cur) / 4) { put_page(page); return NULL; } @@ -579,7 +579,7 @@ int setup_arg_pages(struct linux_binprm *bprm, #ifdef CONFIG_STACK_GROWSUP /* Limit stack size to 1GB */ - stack_base = current->signal->rlim[RLIMIT_STACK].rlim_max; + stack_base = rlimit_max(RLIMIT_STACK); if (stack_base > (1 << 30)) stack_base = 1 << 30; @@ -1535,7 +1535,7 @@ static int format_corename(char *corename, long signr) /* core limit size */ case 'c': rc = snprintf(out_ptr, out_end - out_ptr, - "%lu", current->signal->rlim[RLIMIT_CORE].rlim_cur); + "%lu", rlimit(RLIMIT_CORE)); if (rc > out_end - out_ptr) goto out; out_ptr += rc; @@ -1800,7 +1800,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs) struct coredump_params cprm = { .signr = signr, .regs = regs, - .limit = current->signal->rlim[RLIMIT_CORE].rlim_cur, + .limit = rlimit(RLIMIT_CORE), }; audit_core_dumps(signr); |