Fabio M. De Francesco 7ff57e98fb net/smc: Use a mutex for locking "struct smc_pnettable" ...

smc_pnetid_by_table_ib() uses read_lock() and then it calls smc_pnet_apply_ib()
which, in turn, calls mutex_lock(&smc_ib_devices.mutex).

read_lock() disables preemption. Therefore, the code acquires a mutex while in
atomic context and it leads to a SAC bug.

Fix this bug by replacing the rwlock with a mutex.

Reported-and-tested-by: syzbot+4f322a6d84e991c38775@syzkaller.appspotmail.com
Fixes: 64e28b52c7 ("net/smc: add pnet table namespace support")
Confirmed-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Link: https://lore.kernel.org/r/20220223100252.22562-1-fmdefrancesco@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2022-02-24 09:09:33 -08:00

..

af_smc.c

net/smc: Avoid overwriting the copies of clcsock callback functions

2022-02-11 11:10:29 +00:00

Kconfig

…

Makefile

net/smc: Introduce tracepoint for fallback

2021-11-01 13:39:14 +00:00

smc_cdc.c

net/smc: Introduce a new conn->lgr validity check helper

2022-01-13 13:14:53 +00:00

smc_cdc.h

net/smc: fix kernel panic caused by race of smc_sock

2021-12-28 12:42:45 +00:00

smc_clc.c

net/smc: Introduce a new conn->lgr validity check helper

2022-01-13 13:14:53 +00:00

smc_clc.h

net/smc: add v2 format of CLC decline message

2021-10-16 14:58:13 +01:00

smc_close.c

net/smc: Keep smc_close_final rc during active close

2021-12-02 12:14:36 +00:00

smc_close.h

…

smc_core.c

net/smc: Fix hung_task when removing SMC-R devices

2022-01-16 12:30:28 +00:00

smc_core.h

net/smc: Resolve the race between SMC-R link access and clear

2022-01-13 13:14:53 +00:00

smc_diag.c

Partially revert "net/smc: Add netlink net namespace support"

2022-02-02 07:42:41 -08:00

smc_ib.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

2021-12-31 14:35:40 +00:00

smc_ib.h

net/smc: Introduce net namespace support for linkgroup

2022-01-02 12:07:39 +00:00

smc_ism.c

net: Don't include filter.h from net/sock.h

2021-12-29 08:48:14 -08:00

smc_ism.h

net/smc: keep static copy of system EID

2021-09-14 12:49:10 +01:00

smc_llc.c

net/smc: Print net namespace in log

2022-01-02 12:07:39 +00:00

smc_llc.h

net/smc: extend LLC layer for SMC-Rv2

2021-10-16 14:58:13 +01:00

smc_netlink.c

net/smc: add generic netlink support for system EID

2021-09-14 12:49:10 +01:00

smc_netlink.h

…

smc_netns.h

…

smc_pnet.c

net/smc: Use a mutex for locking "struct smc_pnettable"

2022-02-24 09:09:33 -08:00

smc_pnet.h

net/smc: Use a mutex for locking "struct smc_pnettable"

2022-02-24 09:09:33 -08:00

smc_rx.c

net/smc: Introduce tracepoints for tx and rx msg

2021-11-01 13:39:14 +00:00

smc_rx.h

…

smc_stats.c

…

smc_stats.h

…

smc_tracepoint.c

net/smc: Introduce tracepoint for smcr link down

2021-11-01 13:39:14 +00:00

smc_tracepoint.h

net/smc: Add net namespace for tracepoints

2022-01-02 12:07:39 +00:00

smc_tx.c

net/smc: Introduce tracepoints for tx and rx msg

2021-11-01 13:39:14 +00:00

smc_tx.h

…

smc_wr.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2021-12-30 12:12:12 -08:00

smc_wr.h

net/smc: Remove unused function declaration

2022-01-15 22:57:21 +00:00

smc.h

net/smc: Forward wakeup to smc socket waitqueue after fallback

2022-01-31 11:07:13 +00:00