do_execve() must not clear fs->in_exec if it was set by another thread

If do_execve() fails after check_unsafe_exec(), it clears fs->in_exec
unconditionally. This is wrong if we race with our sub-thread which
also does do_execve:

	Two threads T1 and T2 and another process P, all share the same
	->fs.

	T1 starts do_execve(BAD_FILE). It calls check_unsafe_exec(), since
	->fs is shared, we set LSM_UNSAFE but not ->in_exec.

	P exits and decrements fs->users.

	T2 starts do_execve(), calls check_unsafe_exec(), now ->fs is not
	shared, we set fs->in_exec.

	T1 continues, open_exec(BAD_FILE) fails, we clear ->in_exec and
	return to the user-space.

	T1 does clone(CLONE_FS /* without CLONE_THREAD */).

	T2 continues without LSM_UNSAFE_SHARE while ->fs is shared with
	another process.

Change check_unsafe_exec() to return res = 1 if we set ->in_exec, and change
do_execve() to clear ->in_exec depending on res.

When do_execve() suceeds, it is safe to clear ->in_exec unconditionally.
It can be set only if we don't share ->fs with another process, and since
we already killed all sub-threads either ->in_exec == 0 or we are the
only user of this ->fs.

Also, we do not need fs->lock to clear fs->in_exec.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/compat.c b/fs/compat.c
index 379a399..681ed81 100644 (file)
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1476,6 +1476,7 @@ int compat_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);
@@ -1498,8 +1499,9 @@ int compat_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);
@@ -1546,9 +1548,7 @@ int compat_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);
@@ -1568,9 +1568,8 @@ 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;

diff --git a/fs/exec.c b/fs/exec.c
index 052a961..a2e6989 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1077,9 +1077,11 @@ int check_unsafe_exec(struct linux_binprm *bprm)
        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);
@@ -1284,6 +1286,7 @@ 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 +1309,9 @@ 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 +1359,7 @@ 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 +1379,8 @@ 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;