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authorJeremy Cline <jcline@redhat.com>2018-07-27 22:43:01 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-08-06 16:24:42 +0200
commitd856749a77546f033d9a41cc681ed3a58dba18e9 (patch)
tree6447dacfaef559966fce6c550a25637fa288d130 /net
parent7dfa787508f9150cd7527e06b9216415dcf941f2 (diff)
net: socket: fix potential spectre v1 gadget in socketcall
commit c8e8cd579bb4265651df8223730105341e61a2d1 upstream. '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 <jpoimboe@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Jeremy Cline <jcline@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/socket.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/socket.c b/net/socket.c
index 5b31e5baf3b5..0c544ae48eac 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -89,6 +89,7 @@
#include <linux/magic.h>
#include <linux/slab.h>
#include <linux/xattr.h>
+#include <linux/nospec.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
@@ -2324,6 +2325,7 @@ 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))