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([2a09:80c0:192:0:5dac:bf3d:c41:c3e7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a892e52a26sm16417581f8f.51.2025.07.02.07.44.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 02 Jul 2025 07:44:02 -0700 (PDT) Message-ID: <693725d9-a293-414f-a706-f77446e335b1@redhat.com> Date: Wed, 2 Jul 2025 16:44:01 +0200 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH next] mm/maps: move kmalloc() call location in do_procmap_query() out of RCU critical section To: Jeongjun Park , akpm@linux-foundation.org Cc: andrii@kernel.org, osalvador@suse.de, Liam.Howlett@Oracle.com, surenb@google.com, christophe.leroy@csgroup.eu, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, syzbot+6246a83e7bd9f8a3e239@syzkaller.appspotmail.com References: <20250702135332.291866-1-aha310510@gmail.com> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 02.07.25 15:53, Jeongjun Park wrote: > In do_procmap_query(), we are allocating name_buf as much as name_buf_sz > with kmalloc(). > > However, due to the previous commit eff061546ca5 > ("mm/maps: execute PROCMAP_QUERY ioctl under per-vma locks"), > the location of kmalloc() is located inside the RCU critical section. > > This causes might_sleep_if() to be called inside the RCU critical section, > so we need to move the call location of kmalloc() outside the RCU critical > section to prevent this. > > Reported-by: syzbot+6246a83e7bd9f8a3e239@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=6246a83e7bd9f8a3e239 > Fixes: eff061546ca5 ("mm/maps: execute PROCMAP_QUERY ioctl under per-vma locks") That commit is not upstream yet (and the commit id is not stable), so it should be squashed into the problematic commit. As a side note: the patch subject of this and the original patch should start with "fs/proc/task_mmu", not "mm/maps". -- Cheers, David / dhildenb