Commit be032fd5 authored by Horia Geantă's avatar Horia Geantă Committed by Greg Kroah-Hartman

crypto: caam - fix signals handling

commit 7459e1d2 upstream.

Driver does not properly handle the case when signals interrupt
wait_for_completion_interruptible():
-it does not check for return value
-completion structure is allocated on stack; in case a signal interrupts
the sleep, it will go out of scope, causing the worker thread
(caam_jr_dequeue) to fail when it accesses it

wait_for_completion_interruptible() is replaced with uninterruptable
wait_for_completion().
We choose to block all signals while waiting for I/O (device executing
the split key generation job descriptor) since the alternative - in
order to have a deterministic device state - would be to flush the job
ring (aborting *all* in-progress jobs).

Fixes: 045e3678 ("crypto: caam - ahash hmac support")
Fixes: 4c1ec1f9 ("crypto: caam - refactor key_gen, sg")
Signed-off-by: default avatarHoria Geantă <horia.geanta@nxp.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 17ab2212
...@@ -490,7 +490,7 @@ static int hash_digest_key(struct caam_hash_ctx *ctx, const u8 *key_in, ...@@ -490,7 +490,7 @@ static int hash_digest_key(struct caam_hash_ctx *ctx, const u8 *key_in,
ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result); ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
if (!ret) { if (!ret) {
/* in progress */ /* in progress */
wait_for_completion_interruptible(&result.completion); wait_for_completion(&result.completion);
ret = result.err; ret = result.err;
#ifdef DEBUG #ifdef DEBUG
print_hex_dump(KERN_ERR, print_hex_dump(KERN_ERR,
......
...@@ -103,7 +103,7 @@ int gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len, ...@@ -103,7 +103,7 @@ int gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len,
ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result); ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
if (!ret) { if (!ret) {
/* in progress */ /* in progress */
wait_for_completion_interruptible(&result.completion); wait_for_completion(&result.completion);
ret = result.err; ret = result.err;
#ifdef DEBUG #ifdef DEBUG
print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ", print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ",
......
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