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| author | Eric Dumazet <edumazet@google.com> | 2020-08-13 18:18:34 +0200 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2020-08-14 12:31:10 +0200 |
| commit | 38ba8b9241f5848a49b80fddac9ab5f4692e434e (patch) | |
| tree | 4b7135cc616cdc938566429e6e45256337334038 | |
| parent | Revert "ipv4: tunnel: fix compilation on ARCH=um" (diff) | |
| download | linux-38ba8b9241f5848a49b80fddac9ab5f4692e434e.tar.xz linux-38ba8b9241f5848a49b80fddac9ab5f4692e434e.zip | |
can: j1939: fix kernel-infoleak in j1939_sk_sock2sockaddr_can()
syzbot found that at least 2 bytes of kernel information
were leaked during getsockname() on AF_CAN CAN_J1939 socket.
Since struct sockaddr_can has in fact two holes, simply
clear the whole area before filling it with useful data.
BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0x81/0x90 mm/kmsan/kmsan_hooks.c:253
CPU: 0 PID: 8466 Comm: syz-executor511 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x21c/0x280 lib/dump_stack.c:118
kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
kmsan_internal_check_memory+0x238/0x3d0 mm/kmsan/kmsan.c:423
kmsan_copy_to_user+0x81/0x90 mm/kmsan/kmsan_hooks.c:253
instrument_copy_to_user include/linux/instrumented.h:91 [inline]
_copy_to_user+0x18e/0x260 lib/usercopy.c:39
copy_to_user include/linux/uaccess.h:186 [inline]
move_addr_to_user+0x3de/0x670 net/socket.c:237
__sys_getsockname+0x407/0x5e0 net/socket.c:1909
__do_sys_getsockname net/socket.c:1920 [inline]
__se_sys_getsockname+0x91/0xb0 net/socket.c:1917
__x64_sys_getsockname+0x4a/0x70 net/socket.c:1917
do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440219
Code: Bad RIP value.
RSP: 002b:00007ffe5ee150c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000033
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440219
RDX: 0000000020000240 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a20
R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000
Local variable ----address@__sys_getsockname created at:
__sys_getsockname+0x91/0x5e0 net/socket.c:1894
__sys_getsockname+0x91/0x5e0 net/socket.c:1894
Bytes 2-3 of 24 are uninitialized
Memory access of size 24 starts at ffff8880ba2c7de8
Data copied to user address 0000000020000100
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: Robin van der Gracht <robin@protonic.nl>
Cc: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: linux-can@vger.kernel.org
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/20200813161834.4021638-1-edumazet@google.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
| -rw-r--r-- | net/can/j1939/socket.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c index 78ff9b3f1d40..b634b680177f 100644 --- a/net/can/j1939/socket.c +++ b/net/can/j1939/socket.c @@ -553,6 +553,11 @@ static int j1939_sk_connect(struct socket *sock, struct sockaddr *uaddr, static void j1939_sk_sock2sockaddr_can(struct sockaddr_can *addr, const struct j1939_sock *jsk, int peer) { + /* There are two holes (2 bytes and 3 bytes) to clear to avoid + * leaking kernel information to user space. + */ + memset(addr, 0, J1939_MIN_NAMELEN); + addr->can_family = AF_CAN; addr->can_ifindex = jsk->ifindex; addr->can_addr.j1939.pgn = jsk->addr.pgn; |