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authorJan Glauber <jang@linux.vnet.ibm.com>2011-04-20 10:15:31 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2011-04-20 10:15:43 +0200
commitc708c57e247775928b9a6bce7b4d8d14883bf39b (patch)
treefe47b86f80b931b3cb072a5c687d309cde1e9c7c /arch/s390/crypto/prng.c
parent65f8da475995f667af5298c644707dbd9d646ca6 (diff)
downloadlinux-sh-c708c57e247775928b9a6bce7b4d8d14883bf39b.tar.gz
[S390] prng: prevent access beyond end of stack
While initializing the state of the prng only the first 8 bytes of random data where used, the second 8 bytes were read from the memory after the stack. If only 64 bytes of the kernel stack are used and CONFIG_DEBUG_PAGEALLOC is enabled a kernel panic may occur because of the invalid page access. Use the correct multiplicator to stay within the random data buffer. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/crypto/prng.c')
-rw-r--r--arch/s390/crypto/prng.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/crypto/prng.c b/arch/s390/crypto/prng.c
index 975e3ab13cb5..44bca3f994b0 100644
--- a/arch/s390/crypto/prng.c
+++ b/arch/s390/crypto/prng.c
@@ -76,7 +76,7 @@ static void prng_seed(int nbytes)
/* Add the entropy */
while (nbytes >= 8) {
- *((__u64 *)parm_block) ^= *((__u64 *)buf+i*8);
+ *((__u64 *)parm_block) ^= *((__u64 *)buf+i);
prng_add_entropy();
i += 8;
nbytes -= 8;