| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47576: scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select() |
| |
| In resp_mode_select() sanity check the block descriptor len to avoid UAF. |
| |
| BUG: KASAN: use-after-free in resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c:2509 |
| Read of size 1 at addr ffff888026670f50 by task scsicmd/15032 |
| |
| CPU: 1 PID: 15032 Comm: scsicmd Not tainted 5.15.0-01d0625 #15 |
| Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS |
| Call Trace: |
| <TASK> |
| dump_stack_lvl+0x89/0xb5 lib/dump_stack.c:107 |
| print_address_description.constprop.9+0x28/0x160 mm/kasan/report.c:257 |
| kasan_report.cold.14+0x7d/0x117 mm/kasan/report.c:443 |
| __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 |
| resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c:2509 |
| schedule_resp+0x4af/0x1a10 drivers/scsi/scsi_debug.c:5483 |
| scsi_debug_queuecommand+0x8c9/0x1e70 drivers/scsi/scsi_debug.c:7537 |
| scsi_queue_rq+0x16b4/0x2d10 drivers/scsi/scsi_lib.c:1521 |
| blk_mq_dispatch_rq_list+0xb9b/0x2700 block/blk-mq.c:1640 |
| __blk_mq_sched_dispatch_requests+0x28f/0x590 block/blk-mq-sched.c:325 |
| blk_mq_sched_dispatch_requests+0x105/0x190 block/blk-mq-sched.c:358 |
| __blk_mq_run_hw_queue+0xe5/0x150 block/blk-mq.c:1762 |
| __blk_mq_delay_run_hw_queue+0x4f8/0x5c0 block/blk-mq.c:1839 |
| blk_mq_run_hw_queue+0x18d/0x350 block/blk-mq.c:1891 |
| blk_mq_sched_insert_request+0x3db/0x4e0 block/blk-mq-sched.c:474 |
| blk_execute_rq_nowait+0x16b/0x1c0 block/blk-exec.c:63 |
| sg_common_write.isra.18+0xeb3/0x2000 drivers/scsi/sg.c:837 |
| sg_new_write.isra.19+0x570/0x8c0 drivers/scsi/sg.c:775 |
| sg_ioctl_common+0x14d6/0x2710 drivers/scsi/sg.c:941 |
| sg_ioctl+0xa2/0x180 drivers/scsi/sg.c:1166 |
| __x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:52 |
| do_syscall_64+0x3a/0x80 arch/x86/entry/common.c:50 |
| entry_SYSCALL_64_after_hwframe+0x44/0xae arch/x86/entry/entry_64.S:113 |
| |
| The Linux kernel CVE team has assigned CVE-2021-47576 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.9.294 with commit adcecd50da6cab7b4957cba0606771dcc846c5a9 |
| Fixed in 4.14.259 with commit 90491283b4064220682e4b0687d07b05df01e3bf |
| Fixed in 4.19.222 with commit 04181973c38f3d6a353f9246dcf7fee08024fd9e |
| Fixed in 5.4.168 with commit b847ecff850719c46c95acd25a0d555dfd16e10d |
| Fixed in 5.10.88 with commit a9078e791426c2cbbdf28a320c3670f6e0a611e6 |
| Fixed in 5.15.11 with commit dfc3fff63793c571147930b13c0f8c689c4281ac |
| Fixed in 5.16 with commit e0a2c28da11e2c2b963fc01d50acbf03045ac732 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2021-47576 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/scsi/scsi_debug.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/adcecd50da6cab7b4957cba0606771dcc846c5a9 |
| https://git.kernel.org/stable/c/90491283b4064220682e4b0687d07b05df01e3bf |
| https://git.kernel.org/stable/c/04181973c38f3d6a353f9246dcf7fee08024fd9e |
| https://git.kernel.org/stable/c/b847ecff850719c46c95acd25a0d555dfd16e10d |
| https://git.kernel.org/stable/c/a9078e791426c2cbbdf28a320c3670f6e0a611e6 |
| https://git.kernel.org/stable/c/dfc3fff63793c571147930b13c0f8c689c4281ac |
| https://git.kernel.org/stable/c/e0a2c28da11e2c2b963fc01d50acbf03045ac732 |
