linux-hardening - Re: [PATCH] mm/slab_common: Restore passing "caller" for tracing

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Date:   Sun, 6 Nov 2022 21:23:57 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Kees Cook <keescook@...omium.org>
Cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>, linux-mm@...ck.org,
        stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] mm/slab_common: Restore passing "caller" for tracing

On 11/6/22 11:46, Hyeonggon Yoo wrote:
> On Fri, Nov 04, 2022 at 11:35:34PM -0700, Kees Cook wrote:
>> The "caller" argument was accidentally being ignored in a few places
>> that were recently refactored. Restore these "caller" arguments, instead
>> of _RET_IP_.
>> 
>> Cc: Hyeonggon Yoo <42.hyeyoo@...il.com>
> 
> Acked-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
> 
>> Cc: Vlastimil Babka <vbabka@...e.cz>
>> Cc: Christoph Lameter <cl@...ux.com>
>> Cc: Pekka Enberg <penberg@...nel.org>
>> Cc: David Rientjes <rientjes@...gle.com>
>> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> Cc: Roman Gushchin <roman.gushchin@...ux.dev>
>> Cc: linux-mm@...ck.org
>> Fixes: 11e9734bcb6a ("mm/slab_common: unify NUMA and UMA version of tracepoints")
>> Cc: stable@...r.kernel.org
> 
> 
> BTW I think it can be just sent to next release candidate.
> The referred commit was merged in this development cycle.

Yep, dropped the Cc stable for that reason. Pushed to
slab/for-6.1-rc4/fixes and will send a PR to Linus in few days.
Thanks!

>> Signed-off-by: Kees Cook <keescook@...omium.org>
>> ---
>>  mm/slab_common.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>> 
>> diff --git a/mm/slab_common.c b/mm/slab_common.c
>> index 33b1886b06eb..0e614f9e7ed7 100644
>> --- a/mm/slab_common.c
>> +++ b/mm/slab_common.c
>> @@ -941,7 +941,7 @@ void *__do_kmalloc_node(size_t size, gfp_t flags, int node, unsigned long caller
>>  
>>  	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
>>  		ret = __kmalloc_large_node(size, flags, node);
>> -		trace_kmalloc(_RET_IP_, ret, size,
>> +		trace_kmalloc(caller, ret, size,
>>  			      PAGE_SIZE << get_order(size), flags, node);
>>  		return ret;
>>  	}
>> @@ -953,7 +953,7 @@ void *__do_kmalloc_node(size_t size, gfp_t flags, int node, unsigned long caller
>>  
>>  	ret = __kmem_cache_alloc_node(s, flags, node, size, caller);
>>  	ret = kasan_kmalloc(s, ret, size, flags);
>> -	trace_kmalloc(_RET_IP_, ret, size, s->size, flags, node);
>> +	trace_kmalloc(caller, ret, size, s->size, flags, node);
>>  	return ret;
>>  }
>>  
>> -- 
>> 2.34.1
> 
> 
> Thanks for catching this!
>