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| author | Jeremy Cline <jcline@redhat.com> | 2018-07-27 22:43:01 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-06 16:24:42 +0200 |
| commit | d856749a77546f033d9a41cc681ed3a58dba18e9 (patch) | |
| tree | 6447dacfaef559966fce6c550a25637fa288d130 | |
| parent | 7dfa787508f9150cd7527e06b9216415dcf941f2 (diff) | |
| download | linux-stable-d856749a77546f033d9a41cc681ed3a58dba18e9.tar.gz linux-stable-d856749a77546f033d9a41cc681ed3a58dba18e9.tar.bz2 linux-stable-d856749a77546f033d9a41cc681ed3a58dba18e9.zip | |
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>
| -rw-r--r-- | net/socket.c | 2 |
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)) |