Commit c8e8cd57 authored by Jeremy Cline's avatar Jeremy Cline Committed by David S. Miller

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 <>
Signed-off-by: default avatarJeremy Cline <>
Signed-off-by: default avatarDavid S. Miller <>
parent 958b4cd8
......@@ -89,6 +89,7 @@
#include <linux/magic.h>
#include <linux/slab.h>
#include <linux/xattr.h>
#include <linux/nospec.h>
#include <linux/uaccess.h>
#include <asm/unistd.h>
......@@ -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))
Markdown is supported
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment