Bug 1903291 - kernel: insecure handling of root directory for path lookups in fs/io_uring.c
Summary: kernel: insecure handling of root directory for path lookups in fs/io_uring.c
Keywords:
Status: CLOSED DUPLICATE of bug 1875818
Alias: None
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1903293
Blocks: 1903292
TreeView+ depends on / blocked
 
Reported: 2020-12-01 19:04 UTC by Guilherme de Almeida Suckevicz
Modified: 2020-12-10 12:26 UTC (History)
41 users (show)

Fixed In Version:
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Doc Text:
A flaw was found in the Linux kernel. A process inside a mounted namespace can escape to unintended filesystem locations during path lookups. The highest threat from this vulnerability is to data integrity.
Clone Of:
Environment:
Last Closed: 2020-12-03 11:57:54 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2020-12-01 19:04:40 UTC 
An issue was discovered in fs/io_uring.c in the Linux kernel before 5.6. It unsafely handles the root directory during path lookups, and thus a process inside a mount namespace can escape to unintended filesystem locations.

Reference:
https://bugs.chromium.org/p/project-zero/issues/detail?id=2011

Upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ff002b30181d30cdfbca316dadd099c3ca0d739c
Comment 1 Guilherme de Almeida Suckevicz 2020-12-01 19:09:08 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1903293]
Comment 2 Justin M. Forbes 2020-12-02 14:28:42 UTC 
This was fixed for Fedora with the 5.6 kernel rebases.
Comment 3 Petr Matousek 2020-12-10 12:26:47 UTC 

*** This bug has been marked as a duplicate of bug 1875818 ***
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