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| author |   Eric Dumazet <edumazet@google.com> | 2021-03-12 08:59:48 -0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2021-03-14 14:28:22 -0700 |
| commit | 50535249f624d0072cd885bcdce4e4b6fb770160 (patch) | |
| tree | f715f6988ba18b7c4e464ed6bd26642e20660d10 /net/qrtr | |
| parent | net: arcnet: com20020 fix error handling (diff) | |
| download | linux-dev-50535249f624d0072cd885bcdce4e4b6fb770160.tar.xz linux-dev-50535249f624d0072cd885bcdce4e4b6fb770160.zip | |
net: qrtr: fix a kernel-infoleak in qrtr_recvmsg()
struct sockaddr_qrtr has a 2-byte hole, and qrtr_recvmsg() currently
does not clear it before copying kernel data to user space.
It might be too late to name the hole since sockaddr_qrtr structure is uapi.
BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0x9c/0xb0 mm/kmsan/kmsan_hooks.c:249
CPU: 0 PID: 29705 Comm: syz-executor.3 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x21c/0x280 lib/dump_stack.c:120
kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
kmsan_internal_check_memory+0x202/0x520 mm/kmsan/kmsan.c:402
kmsan_copy_to_user+0x9c/0xb0 mm/kmsan/kmsan_hooks.c:249
instrument_copy_to_user include/linux/instrumented.h:121 [inline]
_copy_to_user+0x1ac/0x270 lib/usercopy.c:33
copy_to_user include/linux/uaccess.h:209 [inline]
move_addr_to_user+0x3a2/0x640 net/socket.c:237
____sys_recvmsg+0x696/0xd50 net/socket.c:2575
___sys_recvmsg net/socket.c:2610 [inline]
do_recvmmsg+0xa97/0x22d0 net/socket.c:2710
__sys_recvmmsg net/socket.c:2789 [inline]
__do_sys_recvmmsg net/socket.c:2812 [inline]
__se_sys_recvmmsg+0x24a/0x410 net/socket.c:2805
__x64_sys_recvmmsg+0x62/0x80 net/socket.c:2805
do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x465f69
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f43659d6188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69
RDX: 0000000000000008 RSI: 0000000020003e40 RDI: 0000000000000003
RBP: 00000000004bfa8f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010060 R11: 0000000000000246 R12: 000000000056bf60
R13: 0000000000a9fb1f R14: 00007f43659d6300 R15: 0000000000022000
Local variable ----addr@____sys_recvmsg created at:
____sys_recvmsg+0x168/0xd50 net/socket.c:2550
____sys_recvmsg+0x168/0xd50 net/socket.c:2550
Bytes 2-3 of 12 are uninitialized
Memory access of size 12 starts at ffff88817c627b40
Data copied to user address 0000000020000140
Fixes: bdabad3e363d ("net: Add Qualcomm IPC router")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Courtney Cavin <courtney.cavin@sonymobile.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/qrtr')
| -rw-r--r-- | net/qrtr/qrtr.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c index edb6ac17ceca..dfc820ee553a 100644 --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -1058,6 +1058,11 @@ static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg, rc = copied; if (addr) { + /* There is an anonymous 2-byte hole after sq_family, + * make sure to clear it. + */ + memset(addr, 0, sizeof(*addr)); + addr->sq_family = AF_QIPCRTR; addr->sq_node = cb->src_node; addr->sq_port = cb->src_port; |