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>
diff --git a/fs/attr.c b/fs/attr.c
index 0a6ea54..0815e93 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -81,7 +81,7 @@
if (inode->i_size < offset) {
unsigned long limit;
- limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
+ limit = rlimit(RLIMIT_FSIZE);
if (limit != RLIM_INFINITY && offset > limit)
goto out_sig;
if (offset > inode->i_sb->s_maxbytes)
diff --git a/fs/binfmt_aout.c b/fs/binfmt_aout.c
index fdd3970..61dd00a 100644
--- a/fs/binfmt_aout.c
+++ b/fs/binfmt_aout.c
@@ -247,7 +247,7 @@
* size limits imposed on them by creating programs with large
* arrays in the data or bss.
*/
- rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
+ rlim = rlimit(RLIMIT_DATA);
if (rlim >= RLIM_INFINITY)
rlim = ~0;
if (ex.a_data + ex.a_bss > rlim)
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 42c6b4a..e0e769b 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -501,7 +501,7 @@
* size limits imposed on them by creating programs with large
* arrays in the data or bss.
*/
- rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
+ rlim = rlimit(RLIMIT_DATA);
if (rlim >= RLIM_INFINITY)
rlim = ~0;
if (data_len + bss_len > rlim) {
diff --git a/fs/exec.c b/fs/exec.c
index 5910307..6348d79 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -195,7 +195,7 @@
* 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 @@
#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 @@
/* 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 @@
struct coredump_params cprm = {
.signr = signr,
.regs = regs,
- .limit = current->signal->rlim[RLIMIT_CORE].rlim_cur,
+ .limit = rlimit(RLIMIT_CORE),
};
audit_core_dumps(signr);
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 97e01dc..452d02f 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -344,7 +344,7 @@
switch (cmd) {
case F_DUPFD:
case F_DUPFD_CLOEXEC:
- if (arg >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
+ if (arg >= rlimit(RLIMIT_NOFILE))
break;
err = alloc_fd(arg, cmd == F_DUPFD_CLOEXEC ? O_CLOEXEC : 0);
if (err >= 0) {
diff --git a/fs/file.c b/fs/file.c
index 38039af..34bb7f7 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -257,7 +257,7 @@
* N.B. For clone tasks sharing a files structure, this test
* will limit the total number of files that can be opened.
*/
- if (nr >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
+ if (nr >= rlimit(RLIMIT_NOFILE))
return -EMFILE;
/* Do we need to expand? */
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 18e20fe..aa8637b 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -273,7 +273,7 @@
rcu_read_lock(); /* FIXME: is this correct? */
qsize = atomic_read(&__task_cred(p)->user->sigpending);
rcu_read_unlock();
- qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
+ qlim = task_rlimit(p, RLIMIT_SIGPENDING);
unlock_task_sighand(p, &flags);
}
@@ -420,7 +420,7 @@
cutime = sig->cutime;
cstime = sig->cstime;
cgtime = sig->cgtime;
- rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
+ rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
/* add up live thread stats at the group level */
if (whole) {
diff --git a/fs/select.c b/fs/select.c
index fd38ce2..73715e9 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -821,7 +821,7 @@
struct poll_list *walk = head;
unsigned long todo = nfds;
- if (nfds > current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
+ if (nfds > rlimit(RLIMIT_NOFILE))
return -EINVAL;
len = min_t(unsigned int, nfds, N_STACK_PPS);