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

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On Tue, Jan 25, 2022 at 08:54:24AM -0500, Vivek Goyal wrote:
> On Tue, Jan 25, 2022 at 05:54:57AM -0500, Jeff Layton wrote:
> 
> [..]
> > -	/*
> > -	 * FIXME: Make security_dentry_init_security() generic. Currently
> > -	 * It only supports single security module and only selinux has
> > -	 * dentry_init_security hook.
> > -	 */
> 
> I think this comment is still very valid. security_dentry_init_security()
> still supports only single security module. It does not have the
> capability to deal with two modules trying to return security context.
> 
> All my patch did was that instead of SELinux, now another LSM could
> return security context and also return xattr name for the security
> context. But it did nothing to allow multiple LSMs to return their
> own security contexts.

Yeah, that still doesn't work.
Your patch did however help uncover what is a but in the current
security_dentry_init_security() implementation afaict. Ceph was on the
safe side so far because it always initialized name unconditionally
because it knew that only selinux was relevant for this.



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