Messages in this thread Patch in this message |  | | | Date | Wed, 06 May 2009 14:46:04 -0700 | | From | Greg KH <> | | Subject | [patch 36/58] Annotate struct fs_structs usage count restriction |
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2.6.29-stable review patch. If anyone has any objections, please let us know.
------------------ From: David Howells <dhowells@redhat.com>
commit 795e2fe0a3b69dbc040d7efcf517e0cbad6901d0 upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- include/linux/fs_struct.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- 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;
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