[Crash-utility] [PATCH] fix "kmem -[sS]" for caches created during SLUB bootstrap
Dave Anderson
anderson at redhat.com
Thu Apr 9 15:23:42 UTC 2020
----- Original Message -----
> Fix for "kmem -[sS]" options on Linux 4.14 and later kernels built
> with CONFIG_SLAB_FREELIST_HARDENED enabled. Without the patch, there
> will error messages of the type "kmem: <cache name> slab: <address>
> invalid freepointer: <obfuscated address>" for caches created during
> SLUB bootstrap, as they are likely to have s->random == 0.
>
> Signed-off-by: Hari Bathini <hbathini at linux.ibm.com>
Hi Hari,
Queued for crash-7.2.9:
https://github.com/crash-utility/crash/commit/1ad5a3622f32387b271584d2fe26c07530bcddc9
Thanks,
Dave
> ---
> memory.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/memory.c b/memory.c
> index ccc2944..c2433eb 100644
> --- a/memory.c
> +++ b/memory.c
> @@ -19244,7 +19244,7 @@ count_free_objects(struct meminfo *si, ulong
> freelist)
> static ulong
> freelist_ptr(struct meminfo *si, ulong ptr, ulong ptr_addr)
> {
> - if (si->random)
> + if (VALID_MEMBER(kmem_cache_random))
> /* CONFIG_SLAB_FREELIST_HARDENED */
> return (ptr ^ si->random ^ ptr_addr);
> else
>
>
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