4.7

CVE-2022-50379

btrfs: fix race between quota enable and quota rescan ioctl

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix race between quota enable and quota rescan ioctl

When enabling quotas, at btrfs_quota_enable(), after committing the
transaction, we change fs_info->quota_root to point to the quota root we
created and set BTRFS_FS_QUOTA_ENABLED at fs_info->flags. Then we try
to start the qgroup rescan worker, first by initializing it with a call
to qgroup_rescan_init() - however if that fails we end up freeing the
quota root but we leave fs_info->quota_root still pointing to it, this
can later result in a use-after-free somewhere else.

We have previously set the flags BTRFS_FS_QUOTA_ENABLED and
BTRFS_QGROUP_STATUS_FLAG_ON, so we can only fail with -EINPROGRESS at
btrfs_quota_enable(), which is possible if someone already called the
quota rescan ioctl, and therefore started the rescan worker.

So fix this by ignoring an -EINPROGRESS and asserting we can't get any
other error.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version < 4.19.262
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.220
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.150
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.75
Linux ≫ Linux Kernel Version >= 5.16 < 5.19.17
Linux ≫ Linux Kernel Version >= 6.0 < 6.0.3
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.1% 0.011
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 4.7 1 3.6
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
134c704f-9b21-4f2e-91b3-4a467353bcc0 4.7 1 3.6
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

https://git.kernel.org/stable/c/c97f6d528c3f1c83a6b792a8a7928c236c80b8fe
Patch
https://git.kernel.org/stable/c/26b7c0ac49a3eea15559c9d84863736a6d1164b4
Patch
https://git.kernel.org/stable/c/47b5ffe86332af95f0f52be0a63d4da7c2b37b55
Patch
https://git.kernel.org/stable/c/4b996a3014ef014af8f97b60c35f5289210a4720
Patch
https://git.kernel.org/stable/c/0efd9dfc00d677a1d0929319a6103cb2dfc41c22
Patch
https://git.kernel.org/stable/c/6c22f86dd221eba0c7af645b1af73dcbc04ee27b
Patch
https://git.kernel.org/stable/c/331cd9461412e103d07595a10289de90004ac890
Patch