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[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>
This commit is contained in:
Jan Glauber 2011-04-20 10:15:31 +02:00 committed by Martin Schwidefsky
parent 65f8da4759
commit c708c57e24
1 changed files with 1 additions and 1 deletions
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2
arch/s390/crypto/prng.c
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@ -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;