diff options
| author | Xin Long <lucien.xin@gmail.com> | 2019-03-08 17:07:34 +0100 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2019-03-11 21:00:44 +0100 |
| commit | 292c997a1970f8d1e1dfa354ed770a22f7b5a434 (patch) | |
| tree | eb65b11e90e9cf5f460930fb13506006759e90f5 /security/selinux | |
| parent | selinux: fix avc audit messages (diff) | |
| download | linux-292c997a1970f8d1e1dfa354ed770a22f7b5a434.tar.xz linux-292c997a1970f8d1e1dfa354ed770a22f7b5a434.zip | |
selinux: add the missing walk_size + len check in selinux_sctp_bind_connect
As does in __sctp_connect(), when checking addrs in a while loop, after
get the addr len according to sa_family, it's necessary to do the check
walk_size + af->sockaddr_len > addrs_size to make sure it won't access
an out-of-bounds addr.
The same thing is needed in selinux_sctp_bind_connect(), otherwise an
out-of-bounds issue can be triggered:
[14548.772313] BUG: KASAN: slab-out-of-bounds in selinux_sctp_bind_connect+0x1aa/0x1f0
[14548.927083] Call Trace:
[14548.938072] dump_stack+0x9a/0xe9
[14548.953015] print_address_description+0x65/0x22e
[14548.996524] kasan_report.cold.6+0x92/0x1a6
[14549.015335] selinux_sctp_bind_connect+0x1aa/0x1f0
[14549.036947] security_sctp_bind_connect+0x58/0x90
[14549.058142] __sctp_setsockopt_connectx+0x5a/0x150 [sctp]
[14549.081650] sctp_setsockopt.part.24+0x1322/0x3ce0 [sctp]
Cc: stable@vger.kernel.org
Fixes: d452930fd3b9 ("selinux: Add SCTP support")
Reported-by: Chunyu Hu <chuhu@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security/selinux')
| -rw-r--r-- | security/selinux/hooks.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 81e012c66d95..3745922c7132 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -5147,6 +5147,9 @@ static int selinux_sctp_bind_connect(struct sock *sk, int optname, return -EINVAL; } + if (walk_size + len > addrlen) + return -EINVAL; + err = -EINVAL; switch (optname) { /* Bind checks */ |