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linux/net/rxrpc
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Xiaolong Huang ff8376ade4 rxrpc: fix some null-ptr-deref bugs in server_key.c 
Some function calls are not implemented in rxrpc_no_security, there are
preparse_server_key, free_preparse_server_key and destroy_server_key.
When rxrpc security type is rxrpc_no_security, user can easily trigger a
null-ptr-deref bug via ioctl. So judgment should be added to prevent it

The crash log:
user@syzkaller:~$ ./rxrpc_preparse_s
[   37.956878][T15626] BUG: kernel NULL pointer dereference, address: 0000000000000000
[   37.957645][T15626] #PF: supervisor instruction fetch in kernel mode
[   37.958229][T15626] #PF: error_code(0x0010) - not-present page
[   37.958762][T15626] PGD 4aadf067 P4D 4aadf067 PUD 4aade067 PMD 0
[   37.959321][T15626] Oops: 0010 [#1] PREEMPT SMP
[   37.959739][T15626] CPU: 0 PID: 15626 Comm: rxrpc_preparse_ Not tainted 5.17.0-01442-gb47d5a4f6b8d #43
[   37.960588][T15626] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014
[   37.961474][T15626] RIP: 0010:0x0
[   37.961787][T15626] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
[   37.962480][T15626] RSP: 0018:ffffc9000d9abdc0 EFLAGS: 00010286
[   37.963018][T15626] RAX: ffffffff84335200 RBX: ffff888012a1ce80 RCX: 0000000000000000
[   37.963727][T15626] RDX: 0000000000000000 RSI: ffffffff84a736dc RDI: ffffc9000d9abe48
[   37.964425][T15626] RBP: ffffc9000d9abe48 R08: 0000000000000000 R09: 0000000000000002
[   37.965118][T15626] R10: 000000000000000a R11: f000000000000000 R12: ffff888013145680
[   37.965836][T15626] R13: 0000000000000000 R14: ffffffffffffffec R15: ffff8880432aba80
[   37.966441][T15626] FS:  00007f2177907700(0000) GS:ffff88803ec00000(0000) knlGS:0000000000000000
[   37.966979][T15626] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   37.967384][T15626] CR2: ffffffffffffffd6 CR3: 000000004aaf1000 CR4: 00000000000006f0
[   37.967864][T15626] Call Trace:
[   37.968062][T15626]  <TASK>
[   37.968240][T15626]  rxrpc_preparse_s+0x59/0x90
[   37.968541][T15626]  key_create_or_update+0x174/0x510
[   37.968863][T15626]  __x64_sys_add_key+0x139/0x1d0
[   37.969165][T15626]  do_syscall_64+0x35/0xb0
[   37.969451][T15626]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   37.969824][T15626] RIP: 0033:0x43a1f9

Signed-off-by: Xiaolong Huang <butterflyhuangxx@gmail.com>
Tested-by: Xiaolong Huang <butterflyhuangxx@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Link: http://lists.infradead.org/pipermail/linux-afs/2022-March/005069.html
Fixes: 12da59fcab ("rxrpc: Hand server key parsing off to the security class")
Link: https://lore.kernel.org/r/164865013439.2941502.8966285221215590921.stgit@warthog.procyon.org.uk
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2022-03-31 15:21:31 +02:00
..
af_rxrpc.c rxrpc: Fix fall-through warnings for Clang 2021-06-04 17:40:04 -05:00
ar-internal.h rxrpc: Fix call timer start racing with call destruction 2022-03-31 12:25:25 +02:00
call_accept.c rxrpc: Fix memory leak in rxrpc_lookup_local 2021-01-28 13:12:14 -08:00
call_event.c rxrpc: Fix call timer start racing with call destruction 2022-03-31 12:25:25 +02:00
call_object.c rxrpc: Fix call timer start racing with call destruction 2022-03-31 12:25:25 +02:00
conn_client.c rxrpc: Fix rxrpc_peer leak in rxrpc_look_up_bundle() 2021-11-29 15:39:40 +00:00
conn_event.c rxrpc: Merge prime_packet_security into init_connection_security 2020-11-23 18:09:30 +00:00
conn_object.c rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
conn_service.c rxrpc: Don't retain the server key in the connection 2020-11-23 18:09:29 +00:00
input.c rxrpc: Call state should be read with READ_ONCE() under some circumstances 2021-01-13 10:38:20 -08:00
insecure.c rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
Kconfig net: RxRPC: make dependent Kconfig symbols be shown indented 2021-08-18 10:12:11 +01:00
key.c rxrpc: Fix handling of an unsupported token type in rxrpc_read() 2021-01-13 10:38:00 -08:00
local_event.c rxrpc: Fix a typo 2021-06-02 14:01:55 -07:00
local_object.c rxrpc: Fix dependency on IPv6 in udp tunnel config 2021-02-12 16:42:05 -08:00
Makefile rxrpc: Split the server key type (rxrpc_s) into its own file 2020-11-23 18:09:29 +00:00
misc.c
net_ns.c
output.c rxrpc: Adjust retransmission backoff 2022-01-22 02:03:24 +00:00
peer_event.c
peer_object.c rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() 2021-11-29 15:40:02 +00:00
proc.c
protocol.h
recvmsg.c afs: Don't truncate iter during data fetch 2021-04-23 10:17:26 +01:00
rtt.c rxrpc: Fix _usecs_to_jiffies() by using usecs_to_jiffies() 2021-09-24 14:18:34 +01:00
rxkad.c rxrpc: rxkad: Remove redundant variable offset 2021-04-27 14:05:06 -07:00
security.c rxrpc: Hand server key parsing off to the security class 2020-11-23 18:09:29 +00:00
sendmsg.c rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
server_key.c rxrpc: fix some null-ptr-deref bugs in server_key.c 2022-03-31 15:21:31 +02:00
skbuff.c
sysctl.c
utils.c