diff options
| author | Jens Axboe <axboe@kernel.dk> | 2024-03-21 07:38:38 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2024-04-15 13:06:19 -0600 |
| commit | c4ce0ab27646f4206a9eb502d6fe45cb080e1cae (patch) | |
| tree | 5ec9094262936d0cfb509d69cb591f545dfcbf6b /io_uring | |
| parent | d6e295061f239bee48c9e49313f68042121e21c2 (diff) | |
io_uring/sqpoll: work around a potential audit memory leak
kmemleak complains that there's a memory leak related to connect
handling:
unreferenced object 0xffff0001093bdf00 (size 128):
comm "iou-sqp-455", pid 457, jiffies 4294894164
hex dump (first 32 bytes):
02 00 fa ea 7f 00 00 01 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 2e481b1a):
[<00000000c0a26af4>] kmemleak_alloc+0x30/0x38
[<000000009c30bb45>] kmalloc_trace+0x228/0x358
[<000000009da9d39f>] __audit_sockaddr+0xd0/0x138
[<0000000089a93e34>] move_addr_to_kernel+0x1a0/0x1f8
[<000000000b4e80e6>] io_connect_prep+0x1ec/0x2d4
[<00000000abfbcd99>] io_submit_sqes+0x588/0x1e48
[<00000000e7c25e07>] io_sq_thread+0x8a4/0x10e4
[<00000000d999b491>] ret_from_fork+0x10/0x20
which can can happen if:
1) The command type does something on the prep side that triggers an
audit call.
2) The thread hasn't done any operations before this that triggered
an audit call inside ->issue(), where we have audit_uring_entry()
and audit_uring_exit().
Work around this by issuing a blanket NOP operation before the SQPOLL
does anything.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/sqpoll.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c index 3983708cef5b..554c7212aa46 100644 --- a/io_uring/sqpoll.c +++ b/io_uring/sqpoll.c @@ -291,6 +291,14 @@ static int io_sq_thread(void *data) sqd->sq_cpu = raw_smp_processor_id(); } + /* + * Force audit context to get setup, in case we do prep side async + * operations that would trigger an audit call before any issue side + * audit has been done. + */ + audit_uring_entry(IORING_OP_NOP); + audit_uring_exit(true, 0); + mutex_lock(&sqd->lock); while (1) { bool cap_entries, sqt_spin = false; |