| commit | 72f7d24df467c93d3abc0c7c8b2ef6b38cb683d9 | [log] [tgz] |
|---|---|---|
| author | Lee Jones <[email protected]> | Tue Jul 19 12:52:51 2022 +0100 |
| committer | Vaibhav Rustagi <[email protected]> | Wed Oct 05 05:09:14 2022 +0000 |
| tree | ae0b24f150eebd9426b7d9fa5f10d402bee8c031 | |
| parent | 64f3f5392bbe5ffd7184b20121dfd6d9befbea41 [diff] |
io_uring: Use original task for req identity in io_identity_cow()
This issue is conceptually identical to the one fixed in 29f077d07051
("io_uring: always use original task when preparing req identity"), so
rather than reinvent the wheel, I'm shamelessly quoting the commit
message from that patch - thanks Jens:
"If the ring is setup with IORING_SETUP_IOPOLL and we have more than
one task doing submissions on a ring, we can up in a situation where
we assign the context from the current task rather than the request
originator.
Always use req->task rather than assume it's the same as current.
No upstream patch exists for this issue, as only older kernels with
the non-native workers have this problem."
BUG=b/250926117
TEST=presubmit
RELEASE_NOTE=None
cos-patch: bug
Cc: Jens Axboe <[email protected]>
Cc: Pavel Begunkov <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: [email protected]
Cc: [email protected]
Fixes: 5c3462cfd123b ("io_uring: store io_identity in io_uring_task")
Signed-off-by: Lee Jones <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
(cherry picked from commit 2ee0cab11f6626071f8a64c7792406dabdd94c8d)
Signed-off-by: Vaibhav Rustagi <[email protected]>
Change-Id: Idd81cec7b831f6de22291db84582ea714fc835af
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/37389
Tested-by: Cusky Presubmit Bot <[email protected]>
Reviewed-by: Oleksandr Tymoshenko <[email protected]>