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fs: use rlimit helpers

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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 3e10e716ab ("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>
This commit is contained in:
Jiri Slaby 2010-03-05 13:42:42 -08:00 committed by Linus Torvalds
parent 221e3ebf6d
commit d554ed895d
8 changed files with 12 additions and 12 deletions
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2
fs/attr.c
View file

@ -81,7 +81,7 @@ int inode_newsize_ok(const struct inode *inode, loff_t offset)
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)

2
fs/binfmt_aout.c
View file

@ -247,7 +247,7 @@ static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
* 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)

2
fs/binfmt_flat.c
View file

@ -501,7 +501,7 @@ static int load_flat_file(struct linux_binprm * bprm,
* 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) {

8
fs/exec.c
View file

@ -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);

2
fs/fcntl.c
View file

@ -344,7 +344,7 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
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) {

2
fs/file.c
View file

@ -257,7 +257,7 @@ int expand_files(struct files_struct *files, int nr)
* 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? */

4
fs/proc/array.c
View file

@ -273,7 +273,7 @@ static inline void task_sig(struct seq_file *m, struct task_struct *p)
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 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
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) {

2
fs/select.c
View file

@ -821,7 +821,7 @@ int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds,
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);