On Sat, Aug 09, 2025 at 05:59:43PM +0800, Edward Adam Davis wrote: > Initialize the intermediary array member to 0 to prevent the kernel from > leaking uninitialized data to user space. > > Reported-by: syzbot+e8bcd7ee3db6cb5cb875@xxxxxxxxxxxxxxxxxxxxxxxxx > Closes: https://syzkaller.appspot.com/bug?extid=e8bcd7ee3db6cb5cb875 > Tested-by: syzbot+e8bcd7ee3db6cb5cb875@xxxxxxxxxxxxxxxxxxxxxxxxx > Signed-off-by: Edward Adam Davis <eadavis@xxxxxx> > --- > crypto/jitterentropy-kcapi.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/crypto/jitterentropy-kcapi.c b/crypto/jitterentropy-kcapi.c > index c24d4ff2b4a8..9e9e069f55af 100644 > --- a/crypto/jitterentropy-kcapi.c > +++ b/crypto/jitterentropy-kcapi.c > @@ -107,7 +107,7 @@ int jent_hash_time(void *hash_state, __u64 time, u8 *addtl, > { > struct shash_desc *hash_state_desc = (struct shash_desc *)hash_state; > SHASH_DESC_ON_STACK(desc, hash_state_desc->tfm); > - u8 intermediary[SHA3_256_DIGEST_SIZE]; > + u8 intermediary[SHA3_256_DIGEST_SIZE] = { 0 }; This is not a leak! The stack memroy is hashed and fed into the entropy pool. If you can recover the original kernel memory from the result, then we have much bigger problems :) Please find a way to mark this as a false positive. Thanks, -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
