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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-28 16:23:59 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-28 16:23:59 (GMT) |
commit | 43937003de5b677781b2fe4c871d628ab00cc341 (patch) | |
tree | 6c718e6d0cb910687da76fae415e3569862c121c | |
parent | 14970f204b1993af7459d5bd34aaff38dfee6670 (diff) | |
parent | 31e6ec4519c0fe0ee4a2f6ba3ab278e9506b9500 (diff) | |
download | linux-43937003de5b677781b2fe4c871d628ab00cc341.tar.xz |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
Pull key fixes from James Morris:
- fix a buffer overflow when displaying /proc/keys [CVE-2016-7042].
- fix broken initialisation in the big_key implementation that can
result in an oops.
- make big_key depend on having a random number generator available in
Kconfig.
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
security/keys: make BIG_KEYS dependent on stdrng.
KEYS: Sort out big_key initialisation
KEYS: Fix short sprintf buffer in /proc/keys show function
-rw-r--r-- | security/keys/Kconfig | 2 | ||||
-rw-r--r-- | security/keys/big_key.c | 59 | ||||
-rw-r--r-- | security/keys/proc.c | 2 |
3 files changed, 34 insertions, 29 deletions
diff --git a/security/keys/Kconfig b/security/keys/Kconfig index f826e87..d942c7c 100644 --- a/security/keys/Kconfig +++ b/security/keys/Kconfig @@ -41,7 +41,7 @@ config BIG_KEYS bool "Large payload keys" depends on KEYS depends on TMPFS - select CRYPTO + depends on (CRYPTO_ANSI_CPRNG = y || CRYPTO_DRBG = y) select CRYPTO_AES select CRYPTO_ECB select CRYPTO_RNG diff --git a/security/keys/big_key.c b/security/keys/big_key.c index c0b3030..835c1ab 100644 --- a/security/keys/big_key.c +++ b/security/keys/big_key.c @@ -9,6 +9,7 @@ * 2 of the Licence, or (at your option) any later version. */ +#define pr_fmt(fmt) "big_key: "fmt #include <linux/init.h> #include <linux/seq_file.h> #include <linux/file.h> @@ -341,44 +342,48 @@ error: */ static int __init big_key_init(void) { - return register_key_type(&key_type_big_key); -} - -/* - * Initialize big_key crypto and RNG algorithms - */ -static int __init big_key_crypto_init(void) -{ - int ret = -EINVAL; + struct crypto_skcipher *cipher; + struct crypto_rng *rng; + int ret; - /* init RNG */ - big_key_rng = crypto_alloc_rng(big_key_rng_name, 0, 0); - if (IS_ERR(big_key_rng)) { - big_key_rng = NULL; - return -EFAULT; + rng = crypto_alloc_rng(big_key_rng_name, 0, 0); + if (IS_ERR(rng)) { + pr_err("Can't alloc rng: %ld\n", PTR_ERR(rng)); + return PTR_ERR(rng); } + big_key_rng = rng; + /* seed RNG */ - ret = crypto_rng_reset(big_key_rng, NULL, crypto_rng_seedsize(big_key_rng)); - if (ret) - goto error; + ret = crypto_rng_reset(rng, NULL, crypto_rng_seedsize(rng)); + if (ret) { + pr_err("Can't reset rng: %d\n", ret); + goto error_rng; + } /* init block cipher */ - big_key_skcipher = crypto_alloc_skcipher(big_key_alg_name, - 0, CRYPTO_ALG_ASYNC); - if (IS_ERR(big_key_skcipher)) { - big_key_skcipher = NULL; - ret = -EFAULT; - goto error; + cipher = crypto_alloc_skcipher(big_key_alg_name, 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(cipher)) { + ret = PTR_ERR(cipher); + pr_err("Can't alloc crypto: %d\n", ret); + goto error_rng; + } + + big_key_skcipher = cipher; + + ret = register_key_type(&key_type_big_key); + if (ret < 0) { + pr_err("Can't register type: %d\n", ret); + goto error_cipher; } return 0; -error: +error_cipher: + crypto_free_skcipher(big_key_skcipher); +error_rng: crypto_free_rng(big_key_rng); - big_key_rng = NULL; return ret; } -device_initcall(big_key_init); -late_initcall(big_key_crypto_init); +late_initcall(big_key_init); diff --git a/security/keys/proc.c b/security/keys/proc.c index f0611a6..b9f531c 100644 --- a/security/keys/proc.c +++ b/security/keys/proc.c @@ -181,7 +181,7 @@ static int proc_keys_show(struct seq_file *m, void *v) struct timespec now; unsigned long timo; key_ref_t key_ref, skey_ref; - char xbuf[12]; + char xbuf[16]; int rc; struct keyring_search_context ctx = { |