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authorDavid Howells <dhowells@redhat.com>2009-03-28 23:23:01 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2009-03-28 17:30:00 -0700
commit795e2fe0a3b69dbc040d7efcf517e0cbad6901d0 (patch)
tree8d39fb27b46822003d316c8ce315211baa13b79d
parent7c2c7d993044cddc5010f6f429b100c63bc7dffb (diff)
downloadvexpress-lsk-795e2fe0a3b69dbc040d7efcf517e0cbad6901d0.tar.gz
Annotate struct fs_struct's usage count restriction
Annotate struct fs_struct's usage count to indicate the restrictions upon it. It may not be incremented, except by clone(CLONE_FS), as this affects the check in check_unsafe_exec() in fs/exec.c. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/fs_struct.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/fs_struct.h b/include/linux/fs_struct.h
index a97c053d3a9..18b467dbe27 100644
--- a/include/linux/fs_struct.h
+++ b/include/linux/fs_struct.h
@@ -4,7 +4,10 @@
#include <linux/path.h>
struct fs_struct {
- atomic_t count;
+ atomic_t count; /* This usage count is used by check_unsafe_exec() for
+ * security checking purposes - therefore it may not be
+ * incremented, except by clone(CLONE_FS).
+ */
rwlock_t lock;
int umask;
struct path root, pwd;