* Re: CVE-2025-40128: btrfs: fix symbolic link reading when bs > ps
[not found] <2025111253-CVE-2025-40128-2dd9@gregkh>
@ 2025-11-13 10:40 ` David Sterba
2025-11-13 17:37 ` Greg Kroah-Hartman
0 siblings, 1 reply; 2+ messages in thread
From: David Sterba @ 2025-11-13 10:40 UTC (permalink / raw)
To: cve, linux-kernel; +Cc: linux-cve-announce, Greg Kroah-Hartman
On Wed, Nov 12, 2025 at 07:24:04PM +0900, Greg Kroah-Hartman wrote:
> From: Greg Kroah-Hartman <gregkh@kernel.org>
>
> Description
> ===========
>
> In the Linux kernel, the following vulnerability has been resolved:
>
> btrfs: fix symbolic link reading when bs > ps
>
> [BUG DURING BS > PS TEST]
> When running the following script on a btrfs whose block size is larger
> than page size, e.g. 8K block size and 4K page size, it will trigger a
> kernel BUG:
>
> # mkfs.btrfs -s 8k $dev
> # mount $dev $mnt
> # mkdir $mnt/dir
> # ln -s dir $mnt/link
> # ls $mnt/link
Please drop the CVE status from this patch, the bs > ps (block size
bigger than page size) feature requires CONFIG_BTRFS_EXPERIMENTAL and is
unfinished and possibly unstable in other use cases. It does not make
sense to improve security where none should be expected.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: CVE-2025-40128: btrfs: fix symbolic link reading when bs > ps
2025-11-13 10:40 ` CVE-2025-40128: btrfs: fix symbolic link reading when bs > ps David Sterba
@ 2025-11-13 17:37 ` Greg Kroah-Hartman
0 siblings, 0 replies; 2+ messages in thread
From: Greg Kroah-Hartman @ 2025-11-13 17:37 UTC (permalink / raw)
To: David Sterba; +Cc: cve, linux-kernel, linux-cve-announce
On Thu, Nov 13, 2025 at 11:40:08AM +0100, David Sterba wrote:
> On Wed, Nov 12, 2025 at 07:24:04PM +0900, Greg Kroah-Hartman wrote:
> > From: Greg Kroah-Hartman <gregkh@kernel.org>
> >
> > Description
> > ===========
> >
> > In the Linux kernel, the following vulnerability has been resolved:
> >
> > btrfs: fix symbolic link reading when bs > ps
> >
> > [BUG DURING BS > PS TEST]
> > When running the following script on a btrfs whose block size is larger
> > than page size, e.g. 8K block size and 4K page size, it will trigger a
> > kernel BUG:
> >
> > # mkfs.btrfs -s 8k $dev
> > # mount $dev $mnt
> > # mkdir $mnt/dir
> > # ln -s dir $mnt/link
> > # ls $mnt/link
>
> Please drop the CVE status from this patch, the bs > ps (block size
> bigger than page size) feature requires CONFIG_BTRFS_EXPERIMENTAL and is
> unfinished and possibly unstable in other use cases. It does not make
> sense to improve security where none should be expected.
Oops, good catch, now rejected, thanks for the review!
greg k-h
^ permalink raw reply [flat|nested] 2+ messages in thread
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2025-11-13 10:40 ` CVE-2025-40128: btrfs: fix symbolic link reading when bs > ps David Sterba
2025-11-13 17:37 ` Greg Kroah-Hartman
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