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authorHerbert Xu <herbert@gondor.apana.org.au>2020-08-27 17:14:36 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2020-08-27 23:20:36 +1000
commitc195d66a8a75c60515819b101975f38b7ec6577f (patch)
tree3664b274d8ef9e53c37a06b28bcce535a7049ac4 /crypto
parentbfe8fe939a049e99e1bda0f81e72a612e83ab446 (diff)
downloadlwn-c195d66a8a75c60515819b101975f38b7ec6577f.tar.gz
lwn-c195d66a8a75c60515819b101975f38b7ec6577f.zip
crypto: af_alg - Work around empty control messages without MSG_MORE
The iwd daemon uses libell which sets up the skcipher operation with two separate control messages. As the first control message is sent without MSG_MORE, it is interpreted as an empty request. While libell should be fixed to use MSG_MORE where appropriate, this patch works around the bug in the kernel so that existing binaries continue to work. We will print a warning however. A separate issue is that the new kernel code no longer allows the control message to be sent twice within the same request. This restriction is obviously incompatible with what iwd was doing (first setting an IV and then sending the real control message). This patch changes the kernel so that this is explicitly allowed. Reported-by: Caleb Jorden <caljorden@hotmail.com> Fixes: f3c802a1f300 ("crypto: algif_aead - Only wake up when...") Cc: <stable@vger.kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/af_alg.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index a6f581ab200c..8be8bec07cdd 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/net.h>
#include <linux/rwsem.h>
+#include <linux/sched.h>
#include <linux/sched/signal.h>
#include <linux/security.h>
@@ -845,9 +846,15 @@ int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size,
}
lock_sock(sk);
- if (ctx->init && (init || !ctx->more)) {
- err = -EINVAL;
- goto unlock;
+ if (ctx->init && !ctx->more) {
+ if (ctx->used) {
+ err = -EINVAL;
+ goto unlock;
+ }
+
+ pr_info_once(
+ "%s sent an empty control message without MSG_MORE.\n",
+ current->comm);
}
ctx->init = true;