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| author | Vasiliy Kulikov <segooon@gmail.com> | 2010-11-10 10:14:33 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-14 16:53:45 -0700 |
| commit | 1fe4497092df6c3a1f32bdd539ebd9747a289e85 (patch) | |
| tree | eaee4008e4d003815127dc010b706bd10e0ffe77 /net | |
| parent | 483cb5a1a2b21a239fb8ed0dfb5f99cdaddf4a3e (diff) | |
| download | lwn-1fe4497092df6c3a1f32bdd539ebd9747a289e85.tar.gz lwn-1fe4497092df6c3a1f32bdd539ebd9747a289e85.zip | |
net: ax25: fix information leak to userland
commit fe10ae53384e48c51996941b7720ee16995cbcb7 upstream.
Sometimes ax25_getname() doesn't initialize all members of fsa_digipeater
field of fsa struct, also the struct has padding bytes between
sax25_call and sax25_ndigis fields. This structure is then copied to
userland. It leads to leaking of contents of kernel stack memory.
Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Moritz Muehlenhoff <jmm@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ax25/af_ax25.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c index f45460730371..608a97b93968 100644 --- a/net/ax25/af_ax25.c +++ b/net/ax25/af_ax25.c @@ -1391,6 +1391,7 @@ static int ax25_getname(struct socket *sock, struct sockaddr *uaddr, ax25_cb *ax25; int err = 0; + memset(fsa, 0, sizeof(fsa)); lock_sock(sk); ax25 = ax25_sk(sk); @@ -1402,7 +1403,6 @@ static int ax25_getname(struct socket *sock, struct sockaddr *uaddr, fsa->fsa_ax25.sax25_family = AF_AX25; fsa->fsa_ax25.sax25_call = ax25->dest_addr; - fsa->fsa_ax25.sax25_ndigis = 0; if (ax25->digipeat != NULL) { ndigi = ax25->digipeat->ndigi; |