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-rw-r--r--fs/exec.c25
1 files changed, 12 insertions, 13 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 052a961..a3a8ce8 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1060,7 +1060,6 @@ EXPORT_SYMBOL(install_exec_creds);
int check_unsafe_exec(struct linux_binprm *bprm)
{
struct task_struct *p = current, *t;
- unsigned long flags;
unsigned n_fs;
int res = 0;
@@ -1068,21 +1067,22 @@ int check_unsafe_exec(struct linux_binprm *bprm)
n_fs = 1;
write_lock(&p->fs->lock);
- lock_task_sighand(p, &flags);
+ rcu_read_lock();
for (t = next_thread(p); t != p; t = next_thread(t)) {
if (t->fs == p->fs)
n_fs++;
}
+ rcu_read_unlock();
if (p->fs->users > n_fs) {
bprm->unsafe |= LSM_UNSAFE_SHARE;
} else {
- if (p->fs->in_exec)
- res = -EAGAIN;
- p->fs->in_exec = 1;
+ res = -EAGAIN;
+ if (!p->fs->in_exec) {
+ p->fs->in_exec = 1;
+ res = 1;
+ }
}
-
- unlock_task_sighand(p, &flags);
write_unlock(&p->fs->lock);
return res;
@@ -1284,6 +1284,7 @@ int do_execve(char * filename,
struct linux_binprm *bprm;
struct file *file;
struct files_struct *displaced;
+ bool clear_in_exec;
int retval;
retval = unshare_files(&displaced);
@@ -1306,8 +1307,9 @@ int do_execve(char * filename,
goto out_unlock;
retval = check_unsafe_exec(bprm);
- if (retval)
+ if (retval < 0)
goto out_unlock;
+ clear_in_exec = retval;
file = open_exec(filename);
retval = PTR_ERR(file);
@@ -1355,9 +1357,7 @@ int do_execve(char * filename,
goto out;
/* execve succeeded */
- write_lock(&current->fs->lock);
current->fs->in_exec = 0;
- write_unlock(&current->fs->lock);
current->in_execve = 0;
mutex_unlock(&current->cred_exec_mutex);
acct_update_integrals(current);
@@ -1377,9 +1377,8 @@ out_file:
}
out_unmark:
- write_lock(&current->fs->lock);
- current->fs->in_exec = 0;
- write_unlock(&current->fs->lock);
+ if (clear_in_exec)
+ current->fs->in_exec = 0;
out_unlock:
current->in_execve = 0;
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