https://github.com/torvalds/linux
Revision 80912cef18f16f8fe59d1fb9548d4364342be360 authored by Dylan Yudaken on 22 February 2022, 16:17:51 UTC, committed by Jens Axboe on 22 February 2022, 16:57:32 UTC
io_rsrc_ref_quiesce will unlock the uring while it waits for references to the io_rsrc_data to be killed. There are other places to the data that might add references to data via calls to io_rsrc_node_switch. There is a race condition where this reference can be added after the completion has been signalled. At this point the io_rsrc_ref_quiesce call will wake up and relock the uring, assuming the data is unused and can be freed - although it is actually being used. To fix this check in io_rsrc_ref_quiesce if a resource has been revived. Reported-by: syzbot+ca8bf833622a1662745b@syzkaller.appspotmail.com Cc: stable@vger.kernel.org Signed-off-by: Dylan Yudaken <dylany@fb.com> Link: https://lore.kernel.org/r/20220222161751.995746-1-dylany@fb.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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History 
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Tip revision: 80912cef18f16f8fe59d1fb9548d4364342be360 authored by Dylan Yudaken on 22 February 2022, 16:17:51 UTC
io_uring: disallow modification of rsrc_data during quiesce
io_uring: disallow modification of rsrc_data during quiesce
Tip revision: 80912ce
| File | Mode | Size |
|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | -rw-r--r-- | 16.6 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 71 bytes |
| .gitattributes | -rw-r--r-- | 62 bytes |
| .gitignore | -rw-r--r-- | 1.9 KB |
| .mailmap | -rw-r--r-- | 21.2 KB |
| COPYING | -rw-r--r-- | 496 bytes |
| CREDITS | -rw-r--r-- | 98.8 KB |
| Kbuild | -rw-r--r-- | 1.3 KB |
| Kconfig | -rw-r--r-- | 555 bytes |
| MAINTAINERS | -rw-r--r-- | 625.5 KB |
| Makefile | -rw-r--r-- | 63.5 KB |
| README | -rw-r--r-- | 727 bytes |
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