diff options
Diffstat (limited to 'crypt/sha512-crypt.c')
| -rw-r--r-- | crypt/sha512-crypt.c | 37 |
1 files changed, 33 insertions, 4 deletions
diff --git a/crypt/sha512-crypt.c b/crypt/sha512-crypt.c index 8f8ed33..e5d9cac 100644 --- a/crypt/sha512-crypt.c +++ b/crypt/sha512-crypt.c @@ -1,5 +1,5 @@ /* One way encryption based on SHA512 sum. - Copyright (C) 2007, 2009 Free Software Foundation, Inc. + Copyright (C) 2007, 2009, 2012 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2007. @@ -122,6 +122,9 @@ __sha512_crypt_r (key, salt, buffer, buflen) /* Default number of rounds. */ size_t rounds = ROUNDS_DEFAULT; bool rounds_custom = false; + size_t alloca_used = 0; + char *free_key = NULL; + char *free_pbytes = NULL; /* Find beginning of salt string. The prefix should normally always be present. Just in case it is not. */ @@ -148,7 +151,17 @@ __sha512_crypt_r (key, salt, buffer, buflen) if ((key - (char *) 0) % __alignof__ (uint64_t) != 0) { - char *tmp = (char *) alloca (key_len + __alignof__ (uint64_t)); + char *tmp; + + if (__libc_use_alloca (alloca_used + key_len + __alignof__ (uint64_t))) + tmp = alloca_account (key_len + __alignof__ (uint64_t), alloca_used); + else + { + free_key = tmp = (char *) malloc (key_len + __alignof__ (uint64_t)); + if (tmp == NULL) + return NULL; + } + key = copied_key = memcpy (tmp + __alignof__ (uint64_t) - (tmp - (char *) 0) % __alignof__ (uint64_t), @@ -170,7 +183,10 @@ __sha512_crypt_r (key, salt, buffer, buflen) /* Initialize libfreebl3. */ NSSLOWInitContext *nss_ictx = NSSLOW_Init (); if (nss_ictx == NULL) - return NULL; + { + free (free_key); + return NULL; + } NSSLOWHASHContext *nss_ctx = NULL; NSSLOWHASHContext *nss_alt_ctx = NULL; #else @@ -233,7 +249,18 @@ __sha512_crypt_r (key, salt, buffer, buflen) sha512_finish_ctx (&alt_ctx, nss_alt_ctx, temp_result); /* Create byte sequence P. */ - cp = p_bytes = alloca (key_len); + if (__libc_use_alloca (alloca_used + key_len)) + cp = p_bytes = (char *) alloca (key_len); + else + { + free_pbytes = cp = p_bytes = (char *)malloc (key_len); + if (free_pbytes == NULL) + { + free (free_key); + return NULL; + } + } + for (cnt = key_len; cnt >= 64; cnt -= 64) cp = mempcpy (cp, temp_result, 64); memcpy (cp, temp_result, cnt); @@ -373,6 +400,8 @@ __sha512_crypt_r (key, salt, buffer, buflen) if (copied_salt != NULL) memset (copied_salt, '\0', salt_len); + free (free_key); + free (free_pbytes); return buffer; } |