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authorDavid Howells <dhowells@redhat.com>2005-09-28 17:03:15 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-28 09:10:47 -0700
commit664cceb0093b755739e56572b836a99104ee8a75 (patch)
treedbaa3ab802803879f29532db4d8a91a54294cf88 /security/keys/proc.c
parent[PATCH] cpuset read past eof memory leak fix (diff)
downloadlinux-dev-664cceb0093b755739e56572b836a99104ee8a75.tar.xz
linux-dev-664cceb0093b755739e56572b836a99104ee8a75.zip
[PATCH] Keys: Add possessor permissions to keys [try #3]
The attached patch adds extra permission grants to keys for the possessor of a key in addition to the owner, group and other permissions bits. This makes SUID binaries easier to support without going as far as labelling keys and key targets using the LSM facilities. This patch adds a second "pointer type" to key structures (struct key_ref *) that can have the bottom bit of the address set to indicate the possession of a key. This is propagated through searches from the keyring to the discovered key. It has been made a separate type so that the compiler can spot attempts to dereference a potentially incorrect pointer. The "possession" attribute can't be attached to a key structure directly as it's not an intrinsic property of a key. Pointers to keys have been replaced with struct key_ref *'s wherever possession information needs to be passed through. This does assume that the bottom bit of the pointer will always be zero on return from kmem_cache_alloc(). The key reference type has been made into a typedef so that at least it can be located in the sources, even though it's basically a pointer to an undefined type. I've also renamed the accessor functions to be more useful, and all reference variables should now end in "_ref". Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security/keys/proc.c')
-rw-r--r--security/keys/proc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/security/keys/proc.c b/security/keys/proc.c
index c55cf1fd0826..12b750e51fbf 100644
--- a/security/keys/proc.c
+++ b/security/keys/proc.c
@@ -167,7 +167,7 @@ static int proc_keys_show(struct seq_file *m, void *v)
#define showflag(KEY, LETTER, FLAG) \
(test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
- seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %06x %5d %5d %-9.9s ",
+ seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
key->serial,
showflag(key, 'I', KEY_FLAG_INSTANTIATED),
showflag(key, 'R', KEY_FLAG_REVOKED),