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Annotate struct fs_struct's usage count restriction

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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>
This commit is contained in:
David Howells
2009-03-28 23:23:01 +00:00
committed by Linus Torvalds
parent 7c2c7d9930
commit 795e2fe0a3
1 changed files with 4 additions and 1 deletions
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5
include/linux/fs_struct.h
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@@ -4,7 +4,10 @@
#include <linux/path.h> #include <linux/path.h>
struct fs_struct { 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; rwlock_t lock;
int umask; int umask;
struct path root, pwd; struct path root, pwd;