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authorAlan Cox <alan@linux.intel.com>2012-10-11 06:24:14 +0000
committerDavid S. Miller <davem@davemloft.net>2012-10-11 15:12:33 -0400
commit0e24c4fc52b16f0a1102a933f636d2f350c41098 (patch)
tree8d70e83af6991d7d997a9638602618e59e12f718 /net/ipv4/sysctl_net_ipv4.c
parent0abc1ceec52fcb9f962a2cd52e89baccccbc1d2e (diff)
downloadblackbird-op-linux-0e24c4fc52b16f0a1102a933f636d2f350c41098.tar.gz
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tcp: sysctl interface leaks 16 bytes of kernel memory
If the rc_dereference of tcp_fastopen_ctx ever fails then we copy 16 bytes of kernel stack into the proc result. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/sysctl_net_ipv4.c')
-rw-r--r--net/ipv4/sysctl_net_ipv4.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 9205e492dc9d..63d4eccc674d 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -248,6 +248,8 @@ int proc_tcp_fastopen_key(ctl_table *ctl, int write, void __user *buffer,
ctxt = rcu_dereference(tcp_fastopen_ctx);
if (ctxt)
memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
+ else
+ memset(user_key, 0, sizeof(user_key));
rcu_read_unlock();
snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
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