From c8e8cd579bb4265651df8223730105341e61a2d1 Mon Sep 17 00:00:00 2001 From: Jeremy Cline Date: Fri, 27 Jul 2018 22:43:01 +0000 Subject: net: socket: fix potential spectre v1 gadget in socketcall 'call' is a user-controlled value, so sanitize the array index after the bounds check to avoid speculating past the bounds of the 'nargs' array. Found with the help of Smatch: net/socket.c:2508 __do_sys_socketcall() warn: potential spectre issue 'nargs' [r] (local cap) Cc: Josh Poimboeuf Cc: stable@vger.kernel.org Signed-off-by: Jeremy Cline Signed-off-by: David S. Miller --- net/socket.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'net/socket.c') diff --git a/net/socket.c b/net/socket.c index 85633622c94d..4ac3b834cce9 100644 --- a/net/socket.c +++ b/net/socket.c @@ -89,6 +89,7 @@ #include #include #include +#include #include #include @@ -2522,6 +2523,7 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) if (call < 1 || call > SYS_SENDMMSG) return -EINVAL; + call = array_index_nospec(call, SYS_SENDMMSG + 1); len = nargs[call]; if (len > sizeof(a)) -- cgit v1.2.3-59-g8ed1b From e978de7a6d382ec378830ca2cf38e902df0b6d84 Mon Sep 17 00:00:00 2001 From: Jeremy Cline Date: Fri, 27 Jul 2018 22:43:02 +0000 Subject: net: socket: Fix potential spectre v1 gadget in sock_is_registered 'family' can be a user-controlled value, so sanitize it after the bounds check to avoid speculative out-of-bounds access. Cc: Josh Poimboeuf Cc: stable@vger.kernel.org Signed-off-by: Jeremy Cline Signed-off-by: David S. Miller --- net/socket.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net/socket.c') diff --git a/net/socket.c b/net/socket.c index 4ac3b834cce9..8c24d5dc4bc8 100644 --- a/net/socket.c +++ b/net/socket.c @@ -2690,7 +2690,8 @@ EXPORT_SYMBOL(sock_unregister); bool sock_is_registered(int family) { - return family < NPROTO && rcu_access_pointer(net_families[family]); + return family < NPROTO && + rcu_access_pointer(net_families[array_index_nospec(family, NPROTO)]); } static int __init sock_init(void) -- cgit v1.2.3-59-g8ed1b