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* [PATCH v7 0/2] firmware_loader: fix uaf in firmware_fallback_sysfs
@ 2021-07-24 12:11 Anirudh Rayabharam
  2021-07-24 12:11 ` [PATCH v7 1/2] firmware_loader: use -ETIMEDOUT instead of -EAGAIN in fw_load_sysfs_fallback Anirudh Rayabharam
  2021-07-24 12:11 ` [PATCH v7 2/2] firmware_loader: fix use-after-free in firmware_fallback_sysfs Anirudh Rayabharam
  0 siblings, 2 replies; 8+ messages in thread
From: Anirudh Rayabharam @ 2021-07-24 12:11 UTC (permalink / raw)
  To: mcgrof, gregkh, rafael, skhan
  Cc: Anirudh Rayabharam, linux-kernel, linux-kernel-mentees

This series fixes the use after free in firmware_fallback_sysfs reported
by syzbot at:

https://syzkaller.appspot.com/bug?extid=de271708674e2093097b

The first patch gets rid of the -EAGAIN return since it doesn't make
sense (see patch description for more info). The second patch goes on to
actually fix the use after free issue.

Changes in v7:
1. Don't move the error handling code from fw_load_sysfs_fallback
   to fw_sysfs_wait_timeout to simplify the patch. Also, the move
   is unnecessary.

2. Fix the commit log for the patch 1 as per Luis' suggestions.

Changes in v6:
1. v5 didn't actually remove -EAGAIN. So, fixed that.

Changes in v5:
1. Split the patch into two patches as discussed here:
   https://lore.kernel.org/lkml/20210715232105.am4wsxfclj2ufjdw@garbanzo/

Changes in v4:
Documented the reasons behind the error codes returned from
fw_sysfs_wait_timeout() as suggested by Luis Chamberlain.

Changes in v3:
Modified the patch to incorporate suggestions by Luis Chamberlain in
order to fix the root cause instead of applying a "band-aid" kind of
fix.
https://lore.kernel.org/lkml/20210403013143.GV4332@42.do-not-panic.com/

Changes in v2:
1. Fixed 1 error and 1 warning (in the commit message) reported by
checkpatch.pl. The error was regarding the format for referring to
another commit "commit <sha> ("oneline")". The warning was for line
longer than 75 chars.

Anirudh Rayabharam (2):
  firmware_loader: use -ETIMEDOUT instead of -EAGAIN in
    fw_load_sysfs_fallback
  firmware_loader: fix use-after-free in firmware_fallback_sysfs

 drivers/base/firmware_loader/fallback.c | 12 +++++++-----
 drivers/base/firmware_loader/firmware.h |  6 +++++-
 drivers/base/firmware_loader/main.c     |  2 ++
 3 files changed, 14 insertions(+), 6 deletions(-)

-- 
2.26.2


^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2021-07-27 12:57 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-07-24 12:11 [PATCH v7 0/2] firmware_loader: fix uaf in firmware_fallback_sysfs Anirudh Rayabharam
2021-07-24 12:11 ` [PATCH v7 1/2] firmware_loader: use -ETIMEDOUT instead of -EAGAIN in fw_load_sysfs_fallback Anirudh Rayabharam
2021-07-26 16:56   ` Shuah Khan
2021-07-26 18:07   ` Luis Chamberlain
2021-07-24 12:11 ` [PATCH v7 2/2] firmware_loader: fix use-after-free in firmware_fallback_sysfs Anirudh Rayabharam
2021-07-26 17:22   ` Shuah Khan
2021-07-26 18:27   ` Luis Chamberlain
2021-07-27 12:57     ` Anirudh Rayabharam

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