Re: [PATCH] security: protect legacy apps from insufficient privilege

["Andrew G. Morgan" <morgan@kernel.org>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Andrew Morton wrote:
| With a judiciously placed `continue' we can do this:
|
| 	CAP_FOR_EACH_U32(i) {
| 		__u32 value_cpu;
|
| 		if (i >= tocopy) {
| 			/*
| 			 * Legacy capability sets have no upper bits
| 			 */
| 			bprm->cap_post_exec_permitted.cap[i] = 0;
| 			continue;
| 		}
| 		/*
| 		 * pP' = (X & fP) | (pI & fI)
| 		 */
| 		value_cpu = le32_to_cpu(caps->data[i].permitted);
| 		bprm->cap_post_exec_permitted.cap[i] =
| 			(current->cap_bset.cap[i] & value_cpu) |
| 			(current->cap_inheritable.cap[i] &
| 				le32_to_cpu(caps->data[i].inheritable));
| 		if (value_cpu & ~bprm->cap_post_exec_permitted.cap[i]) {
| 			/*
| 			 * insufficient to execute correctly
| 			 */
| 			ret = -EPERM;
| 		}
| 	}
|
| OK?

Yes.

Acked-by: Andrew G. Morgan <morgan@kernel.org>

Cheers

Andrew
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.6 (GNU/Linux)

iD8DBQFINXLL+bHCR3gb8jsRAiGUAJ49d61n7+uhc3M5vJjT5398w9tRGgCgwLRe
vXHOIIJAoHvlGNACagKSPes=
=oPN0
-----END PGP SIGNATURE-----