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Filename Latest commit message Latest commit date
Christian Brauner 8acbf4a88c acct: perform last write from workqueue
[ Upstream commit 56d5f3eba3f5de0efdd556de4ef381e109b973a9 ]

In [1] it was reported that the acct(2) system call can be used to
trigger NULL deref in cases where it is set to write to a file that
triggers an internal lookup. This can e.g., happen when pointing acc(2)
to /sys/power/resume. At the point the where the write to this file
happens the calling task has already exited and called exit_fs(). A
lookup will thus trigger a NULL-deref when accessing current->fs.

Reorganize the code so that the the final write happens from the
workqueue but with the caller's credentials. This preserves the
(strange) permission model and has almost no regression risk.

This api should stop to exist though.

Link: https://lore.kernel.org/r/20250127091811.3183623-1-quzicheng@huawei.com [1]
Link: https://lore.kernel.org/r/20250211-work-acct-v1-1-1c16aecab8b3@kernel.org
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: Zicheng Qu <quzicheng@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-03-13 12:43:26 +01:00
arch x86/CPU: Fix warm boot hang regression on AMD SC1100 SoC systems 2025-03-13 12:43:25 +01:00
block
certs
crypto crypto: testmgr - some more fixes to RSA test vectors 2025-03-13 12:43:21 +01:00
Documentation
drivers phy: exynos5-usbdrd: fix MPLL_MULTIPLIER and SSC_REFCLKSEL masks in refclk 2025-03-13 12:43:25 +01:00
fs
include net: extract port range fields from fl_flow_key 2025-03-13 12:43:23 +01:00
init
ipc
kernel acct: perform last write from workqueue 2025-03-13 12:43:26 +01:00
lib
LICENSES
mm memcg: fix soft lockup in the OOM process 2025-03-13 12:43:21 +01:00
net drop_monitor: fix incorrect initialization order 2025-03-13 12:43:26 +01:00
samples
scripts
security
sound ASoC: es8328: fix route from DAC to output 2025-03-13 12:43:24 +01:00
tools
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Linux kernel
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There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
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the problems which may result by upgrading your kernel.