Re: "kernel NULL pointer dereference" crash when attempting a write

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On 1/25/2022 11:57 AM, Paul Moore wrote:
On Tue, Jan 25, 2022 at 12:09 PM Casey Schaufler <casey@xxxxxxxxxxxxxxxx> wrote:
On 1/25/2022 7:56 AM, Vivek Goyal wrote:
On Tue, Jan 25, 2022 at 07:32:19AM -0500, Jeff Layton wrote:
On Tue, 2022-01-25 at 13:12 +0100, Christian Brauner wrote:
On Tue, Jan 25, 2022 at 06:25:39AM -0500, Jeff Layton wrote:
On Tue, 2022-01-25 at 12:13 +0100, Christian Brauner wrote:
On Tue, Jan 25, 2022 at 05:54:57AM -0500, Jeff Layton wrote:
On Mon, 2022-01-24 at 21:45 -0500, Paul Moore wrote:
On Mon, Jan 24, 2022 at 8:51 PM Stephen Muth <smuth4@xxxxxxxxx> wrote:
...

Joining the conversation late. Wish someone had brought me
in sooner.
For some reason I thought the LSM list was on the To/CC line, my
mistake (fixed now).

Thanks to everyone for all of the further discussion, review on this;
I plucked the original post out of my spam folder as I was shutting
down for the night yesterday and only gave it a quick look.

Looks like dentry_init_security() can't handle multiple LSMs. We probably
should disallow all other LSMs to register a hook for this and only
allow SELinux to register a hook.
Not acceptable. The fix to dentry_init_security() is easy.
Sounds good to me, Vivek did you want to put together a patch for
this?  If not, let me know and I'll put one together.

Thank you. I'd do it myself, but I'm dealing with pain meds and a
hinky keyboard. Rarely a great start for a good patch.




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