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([2620:10d:c090:600::1:f6f8]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2157145fd3fsm70721165ad.264.2024.12.04.10.43.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Dec 2024 10:43:31 -0800 (PST) Message-ID: <9ddf41e2-bee6-4b31-a602-53b5485e0f6e@kernel.dk> Date: Wed, 4 Dec 2024 11:43:30 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [io-uring?] KASAN: null-ptr-deref Write in sys_io_uring_register To: Tamir Duberstein , Matthew Wilcox Cc: syzbot , asml.silence@gmail.com, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, Andrew Morton References: <67505f88.050a0220.17bd51.0069.GAE@google.com> <6be84787-b1d9-4a20-85f3-34d8d9a0d492@kernel.dk> <1ab4e254-0254-4089-888b-2ec2ce152302@kernel.dk> Content-Language: en-US From: Jens Axboe In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 12/4/24 11:39 AM, Tamir Duberstein wrote: > On Wed, Dec 4, 2024 at 11:30 AM Tamir Duberstein wrote: >> >> On Wed, Dec 4, 2024 at 11:25 AM Matthew Wilcox wrote: >>> >>> On Wed, Dec 04, 2024 at 09:17:27AM -0700, Jens Axboe wrote: >>>>> XA_STATE(xas, xa, index); >>>>> - return xas_result(&xas, xas_store(&xas, NULL)); >>>>> + return xas_result(&xas, xa_zero_to_null(xas_store(&xas, NULL))); >>>>> } >>>>> EXPORT_SYMBOL(__xa_erase); >>>>> >>>>> This would explain deletion of a reserved entry returning >>>>> `XA_ZERO_ENTRY` rather than `NULL`. >>>> >>>> Yep this works. >>>> >>>>> My apologies for this breakage. Should I send a new version? A new >>>>> "fixes" patch? >>>> >>>> Since it seems quite drastically broken, and since it looks like Andrew >>>> is holding it, seems like the best course of action would be to have it >>>> folded with the existing patch. > > Is there anything I can do to help with this? I think Andrew will just fold it in once he sees this thread - but if you want to be sure, I'd send it out separately with a note below the '---' line asking him to fold it with the problematic patch. -- Jens Axboe