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Tue, 28 Jan 2020 14:58:07 +0000 (GMT) Subject: Re: KASAN: slab-out-of-bounds Write in vgacon_scroll To: Petr Mladek , anon anon <742991625abc@gmail.com> Cc: wangkefeng.wang@huawei.com, sergey.senozhatsky@gmail.com, syzkaller@googlegroups.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org From: Bartlomiej Zolnierkiewicz Message-ID: <4ab69855-6112-52f4-bee2-3358664d0c20@samsung.com> Date: Tue, 28 Jan 2020 15:58:04 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20200128124912.chttagasucdpydhk@pathway.suse.cz> Content-Language: en-US Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrGKsWRmVeSWpSXmKPExsWy7djP87oMPgZxBt/3Sls87O1htbjy9T2b xYm+D6wWl3fNYbP4//grq8Xaz4/ZLY686Wa2aPx8n9GBw2PnrLvsHnsmnmTzaDnyltXjfvdx Jo/1W66yeHzeJBfAFsVlk5Kak1mWWqRvl8CVcXetc8EWroq+2cvZGxjXc3QxcnJICJhIzP3X ydTFyMUhJLCCUWJKy0Q2COcLo8SPwyugnM+MEm+fLWSCaXnZtYQVIrGcUWLy+1NQVW8ZJc4/ +MAIUiUsYCtxsKmBGcQWEXCT2PGmA6yDWWAHo8Su/zfBitgErCQmtq8Cs3kF7CQOrzgAtoJF QFVi4tceNhBbVCBC4tODw6wQNYISJ2c+YQGxOYHqX896B2YzC4hL3HoynwnClpfY/nYOM8gy CYFD7BJ7ft5ihrjbReLl9QUsELawxKvjW9ghbBmJ05N7WCAa1jFK/O14AdW9nVFi+eR/bBBV 1hJ3zv0CsjmAVmhKrN+lDxF2lNjVMBEsLCHAJ3HjrSDEEXwSk7ZNZ4YI80p0tAlBVKtJbFi2 gQ1mbdfOlcwTGJVmIXltFpJ3ZiF5ZxbC3gWMLKsYxVNLi3PTU4uN8lLL9YoTc4tL89L1kvNz NzECU9Ppf8e/7GDc9SfpEKMAB6MSD+8MFYM4IdbEsuLK3EOMEhzMSiK8nUxAId6UxMqq1KL8 +KLSnNTiQ4zSHCxK4rzGi17GCgmkJ5akZqemFqQWwWSZODilGhjXrLwYxP4qvEvpuc7l9w19 8/deMTA4d2jahcL6/M1KPRteyn7x2WXHoDBrmXvWp0ennmcYc060+qUYteiJbSjH1TlyIvGJ x/7aZXkbVwVUh79dln0xeJm5+t8ve/Z+OjY//uGu1d6FMou54nrLFD/u2bz5Q9fiy9rRGz9d q3q+Ilp6U1sfh95tJZbijERDLeai4kQA9rYmqUkDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrKIsWRmVeSWpSXmKPExsVy+t/xu7oMPgZxBvNjLR729rBaXPn6ns3i RN8HVovLu+awWfx//JXVYu3nx+wWR950M1s0fr7P6MDhsXPWXXaPPRNPsnm0HHnL6nG/+ziT x/otV1k8Pm+SC2CL0rMpyi8tSVXIyC8usVWKNrQw0jO0tNAzMrHUMzQ2j7UyMlXSt7NJSc3J LEst0rdL0Mu4u9a5YAtXRd/s5ewNjOs5uhg5OSQETCRedi1hBbGFBJYySvzZytPFyAEUl5E4 vr4MokRY4s+1LrYuRi6gkteMEnsXfwGrFxawlTjY1MAMYosIuEnseNPBClLELLCDUeJHxyEW iI4bjBIrb68A62ATsJKY2L6KEcTmFbCTOLziABOIzSKgKjHxaw8biC0qECFxeMcsqBpBiZMz n7CA2JxA9a9nvQOzmQXUJf7Mu8QMYYtL3HoynwnClpfY/nYO8wRGoVlI2mchaZmFpGUWkpYF jCyrGEVSS4tz03OLjfSKE3OLS/PS9ZLzczcxAqNw27GfW3Ywdr0LPsQowMGoxMProGQQJ8Sa WFZcmXuIUYKDWUmEt5MJKMSbklhZlVqUH19UmpNafIjRFOi5icxSosn5wASRVxJvaGpobmFp aG5sbmxmoSTO2yFwMEZIID2xJDU7NbUgtQimj4mDU6qBsfftHNkTtdqqTzNu8KWpCi5+0Do3 ZIug7r6levtMjvm+EFnjkfh1tVe8zYG5U75eXefe/mu204l8Z22JBZ+33WHgfnbI9Eey0rX7 3QstRZcUsZ5aWMKj7H1R5E2HBAf3l2Pm3vWTm057pj3UOG+/Tueg3Mqfz1/PfeMY9LjsmmyL ofJyz2dPDyuxFGckGmoxFxUnAgCwvaoz2AIAAA== X-CMS-MailID: 20200128145808eucas1p2e0de9fc3d007c682251ce1a320b6906d X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20200128124918eucas1p1f0ce2b2b7b33a5d63d33f876ef30f454 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200128124918eucas1p1f0ce2b2b7b33a5d63d33f876ef30f454 References: <20200128124912.chttagasucdpydhk@pathway.suse.cz> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/28/20 1:49 PM, Petr Mladek wrote: > On Tue 2020-01-28 18:23:46, anon anon wrote: >> Dear Linux kernel developers, >> >> I found the crash "KASAN: slab-out-of-bounds Write in vgacon_scroll" >> when running syzkaller, hope it's unknown: >> >> Linux version: Linux v4.17-rc4 (75bc37fefc44) >> Branch: master >> >> This crash still exists on the latest linux kernel Linux v5.5-rc6. >> Please get C repo and crash log generated by syzkaller, as well as the >> .config I used for linux kernel from the attachment. Thanks. > > The out-of-bound access seems to be in vgacon_scroll() and thus > in vgacon code. > > Unfortunately, most people in CC are printk-guys. They were mentioned > by ./scripts/get_maintainer.pl -f drivers/video/console/vgacon.c > just because the very last comment (tree wide pr_warning() clean up). > > Bartolomej seems to be the only relevant name. > > Bartolomej, > > are you going to look at it? Or should we add more people or some list Help is welcomed as I'm not going to look at it in the foreseeable future (I'm busy enough with other things). > (dri-devel@lists.freedesktop.org or linux-fbdev@vger.kernel.org) into CC? Added to Cc:, thanks. > Thanks, > Petr Best regards, -- Bartlomiej Zolnierkiewicz Samsung R&D Institute Poland Samsung Electronics