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Diffstat (limited to 'kernel/sys.c')
-rw-r--r--kernel/sys.c71
1 files changed, 37 insertions, 34 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index c762eebdebf7..bc7d1be0960e 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1273,18 +1273,21 @@ SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
#endif
/* make sure you are allowed to change @tsk limits before calling this */
-int do_setrlimit(struct task_struct *tsk, unsigned int resource,
- struct rlimit *new_rlim)
+int do_prlimit(struct task_struct *tsk, unsigned int resource,
+ struct rlimit *new_rlim, struct rlimit *old_rlim)
{
- struct rlimit *old_rlim;
+ struct rlimit *rlim;
int retval = 0;
if (resource >= RLIM_NLIMITS)
return -EINVAL;
- if (new_rlim->rlim_cur > new_rlim->rlim_max)
- return -EINVAL;
- if (resource == RLIMIT_NOFILE && new_rlim->rlim_max > sysctl_nr_open)
- return -EPERM;
+ if (new_rlim) {
+ if (new_rlim->rlim_cur > new_rlim->rlim_max)
+ return -EINVAL;
+ if (resource == RLIMIT_NOFILE &&
+ new_rlim->rlim_max > sysctl_nr_open)
+ return -EPERM;
+ }
/* protect tsk->signal and tsk->sighand from disappearing */
read_lock(&tasklist_lock);
@@ -1293,42 +1296,42 @@ int do_setrlimit(struct task_struct *tsk, unsigned int resource,
goto out;
}
- old_rlim = tsk->signal->rlim + resource;
+ rlim = tsk->signal->rlim + resource;
task_lock(tsk->group_leader);
- if (new_rlim->rlim_max > old_rlim->rlim_max &&
- !capable(CAP_SYS_RESOURCE))
- retval = -EPERM;
- if (!retval)
- retval = security_task_setrlimit(tsk->group_leader, resource,
- new_rlim);
-
- if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) {
- /*
- * The caller is asking for an immediate RLIMIT_CPU
- * expiry. But we use the zero value to mean "it was
- * never set". So let's cheat and make it one second
- * instead
- */
- new_rlim->rlim_cur = 1;
+ if (new_rlim) {
+ if (new_rlim->rlim_max > rlim->rlim_max &&
+ !capable(CAP_SYS_RESOURCE))
+ retval = -EPERM;
+ if (!retval)
+ retval = security_task_setrlimit(tsk->group_leader,
+ resource, new_rlim);
+ if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) {
+ /*
+ * The caller is asking for an immediate RLIMIT_CPU
+ * expiry. But we use the zero value to mean "it was
+ * never set". So let's cheat and make it one second
+ * instead
+ */
+ new_rlim->rlim_cur = 1;
+ }
+ }
+ if (!retval) {
+ if (old_rlim)
+ *old_rlim = *rlim;
+ if (new_rlim)
+ *rlim = *new_rlim;
}
-
- if (!retval)
- *old_rlim = *new_rlim;
task_unlock(tsk->group_leader);
- if (retval || resource != RLIMIT_CPU)
- goto out;
-
/*
* RLIMIT_CPU handling. Note that the kernel fails to return an error
* code if it rejected the user's attempt to set RLIMIT_CPU. This is a
* very long-standing error, and fixing it now risks breakage of
* applications, so we live with it
*/
- if (new_rlim->rlim_cur == RLIM_INFINITY)
- goto out;
-
- update_rlimit_cpu(tsk, new_rlim->rlim_cur);
+ if (!retval && new_rlim && resource == RLIMIT_CPU &&
+ new_rlim->rlim_cur != RLIM_INFINITY)
+ update_rlimit_cpu(tsk, new_rlim->rlim_cur);
out:
read_unlock(&tasklist_lock);
return retval;
@@ -1340,7 +1343,7 @@ SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim)
if (copy_from_user(&new_rlim, rlim, sizeof(*rlim)))
return -EFAULT;
- return do_setrlimit(current, resource, &new_rlim);
+ return do_prlimit(current, resource, &new_rlim, NULL);
}
/*