mm, slub: make some slub_debug related attributes read-only (ad38b5b1) · Commits · 戴 / test

SLUB_DEBUG creates several files under /sys/kernel/slab/<cache>/ that can be read to check if the respective debugging options are enabled for given cache. The options can be also toggled at runtime by writing into the files. Some of those, namely red_zone, poison, and store_user can be toggled only when no objects yet exist in the cache. Vijayanand reports [1] that there is a problem with freelist randomization if changing the debugging option's state results in different number of objects per page, and the random sequence cache needs thus needs to be recomputed. However, another problem is that the check for "no objects yet exist in the cache" is racy, as noted by Jann [2] and fixing that would add overhead or otherwise complicate the allocation/freeing paths. Thus it would be much simpler just to remove the runtime toggling support. The documentation describes it's "In case you forgot to enable debugging on the kernel command line", but the neccessity of having no objects limits its usefulness anyway for many caches. Vijayanand describes an use case [3] where debugging is enabled for all but zram caches for memory overhead reasons, and using the runtime toggles was the only way to achieve such configuration. After the previous patch it's now possible to do that directly from the kernel boot option, so we can remove the dangerous runtime toggles by making the /sys attribute files read-only. While updating it, also improve the documentation of the debugging /sys files. [1] https://lkml.kernel.org/r/1580379523-32272-1-git-send-email-vjitta@codeaurora.org [2] https://lore.kernel.org/r/CAG48ez31PP--h6_FzVyfJ4H86QYczAFPdxtJHUEEan+7VJETAQ@mail.gmail.com [3] https://lore.kernel.org/r/1383cd32-1ddc-4dac-b5f8-9c42282fa81c@codeaurora.org Reported-by:

Vijayanand Jitta <vjitta@codeaurora.org> Reported-by:

Jann Horn <jannh@google.com> Signed-off-by:

Vlastimil Babka <vbabka@suse.cz> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Reviewed-by:

Kees Cook <keescook@chromium.org> Acked-by:

Roman Gushchin <guro@fb.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Pekka Enberg <penberg@kernel.org> Link: http://lkml.kernel.org/r/20200610163135.17364-3-vbabka@suse.cz Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

Documentation/vm/slub.rst

+17 −11

Original line number	Diff line number	Diff line
		@@ -101,20 +101,26 @@ with "-" as options::

		slub_debug=FZ;-,zs_handle,zspage

		In case you forgot to enable debugging on the kernel command line: It is
		possible to enable debugging manually when the kernel is up. Look at the
		contents of::
		The state of each debug option for a slab can be found in the respective files
		under::

		/sys/kernel/slab/<slab name>/

		Look at the writable files. Writing 1 to them will enable the
		corresponding debug option. All options can be set on a slab that does
		not contain objects. If the slab already contains objects then sanity checks
		and tracing may only be enabled. The other options may cause the realignment
		of objects.

		Careful with tracing: It may spew out lots of information and never stop if
		used on the wrong slab.
		If the file contains 1, the option is enabled, 0 means disabled. The debug
		options from the ``slub_debug`` parameter translate to the following files::

		F sanity_checks
		Z red_zone
		P poison
		U store_user
		T trace
		A failslab

		The sanity_checks, trace and failslab files are writable, so writing 1 or 0
		will enable or disable the option at runtime. The writes to trace and failslab
		may return -EINVAL if the cache is subject to slab merging. Careful with
		tracing: It may spew out lots of information and never stop if used on the
		wrong slab.

		Slab merging
		============

mm/slub.c

+3 −43

Original line number	Diff line number	Diff line
		@@ -5335,61 +5335,21 @@ static ssize_t red_zone_show(struct kmem_cache s, char buf)
		return sprintf(buf, "%d\n", !!(s->flags & SLAB_RED_ZONE));
		}

		static ssize_t red_zone_store(struct kmem_cache *s,
		const char *buf, size_t length)
		{
		if (any_slab_objects(s))
		return -EBUSY;

		s->flags &= ~SLAB_RED_ZONE;
		if (buf[0] == '1') {
		s->flags \|= SLAB_RED_ZONE;
		}
		calculate_sizes(s, -1);
		return length;
		}
		SLAB_ATTR(red_zone);
		SLAB_ATTR_RO(red_zone);

		static ssize_t poison_show(struct kmem_cache s, char buf)
		{
		return sprintf(buf, "%d\n", !!(s->flags & SLAB_POISON));
		}

		static ssize_t poison_store(struct kmem_cache *s,
		const char *buf, size_t length)
		{
		if (any_slab_objects(s))
		return -EBUSY;

		s->flags &= ~SLAB_POISON;
		if (buf[0] == '1') {
		s->flags \|= SLAB_POISON;
		}
		calculate_sizes(s, -1);
		return length;
		}
		SLAB_ATTR(poison);
		SLAB_ATTR_RO(poison);

		static ssize_t store_user_show(struct kmem_cache s, char buf)
		{
		return sprintf(buf, "%d\n", !!(s->flags & SLAB_STORE_USER));
		}

		static ssize_t store_user_store(struct kmem_cache *s,
		const char *buf, size_t length)
		{
		if (any_slab_objects(s))
		return -EBUSY;

		s->flags &= ~SLAB_STORE_USER;
		if (buf[0] == '1') {
		s->flags &= ~__CMPXCHG_DOUBLE;
		s->flags \|= SLAB_STORE_USER;
		}
		calculate_sizes(s, -1);
		return length;
		}
		SLAB_ATTR(store_user);
		SLAB_ATTR_RO(store_user);

		static ssize_t validate_show(struct kmem_cache s, char buf)
		{

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