| 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-2021-47580: scsi: scsi_debug: Fix type in min_t to avoid stack OOB |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| scsi: scsi_debug: Fix type in min_t to avoid stack OOB |
| |
| Change min_t() to use type "u32" instead of type "int" to avoid stack out |
| of bounds. With min_t() type "int" the values get sign extended and the |
| larger value gets used causing stack out of bounds. |
| |
| BUG: KASAN: stack-out-of-bounds in memcpy include/linux/fortify-string.h:191 [inline] |
| BUG: KASAN: stack-out-of-bounds in sg_copy_buffer+0x1de/0x240 lib/scatterlist.c:976 |
| Read of size 127 at addr ffff888072607128 by task syz-executor.7/18707 |
| |
| CPU: 1 PID: 18707 Comm: syz-executor.7 Not tainted 5.15.0-syzk #1 |
| Hardware name: Red Hat KVM, BIOS 1.13.0-2 |
| Call Trace: |
| __dump_stack lib/dump_stack.c:88 [inline] |
| dump_stack_lvl+0x89/0xb5 lib/dump_stack.c:106 |
| print_address_description.constprop.9+0x28/0x160 mm/kasan/report.c:256 |
| __kasan_report mm/kasan/report.c:442 [inline] |
| kasan_report.cold.14+0x7d/0x117 mm/kasan/report.c:459 |
| check_region_inline mm/kasan/generic.c:183 [inline] |
| kasan_check_range+0x1a3/0x210 mm/kasan/generic.c:189 |
| memcpy+0x23/0x60 mm/kasan/shadow.c:65 |
| memcpy include/linux/fortify-string.h:191 [inline] |
| sg_copy_buffer+0x1de/0x240 lib/scatterlist.c:976 |
| sg_copy_from_buffer+0x33/0x40 lib/scatterlist.c:1000 |
| fill_from_dev_buffer.part.34+0x82/0x130 drivers/scsi/scsi_debug.c:1162 |
| fill_from_dev_buffer drivers/scsi/scsi_debug.c:1888 [inline] |
| resp_readcap16+0x365/0x3b0 drivers/scsi/scsi_debug.c:1887 |
| schedule_resp+0x4d8/0x1a70 drivers/scsi/scsi_debug.c:5478 |
| scsi_debug_queuecommand+0x8c9/0x1ec0 drivers/scsi/scsi_debug.c:7533 |
| scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1520 [inline] |
| scsi_queue_rq+0x16b0/0x2d40 drivers/scsi/scsi_lib.c:1699 |
| blk_mq_dispatch_rq_list+0xb9b/0x2700 block/blk-mq.c:1639 |
| __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:1761 |
| __blk_mq_delay_run_hw_queue+0x4f8/0x5c0 block/blk-mq.c:1838 |
| 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:62 |
| sg_common_write.isra.18+0xeb3/0x2000 drivers/scsi/sg.c:836 |
| sg_new_write.isra.19+0x570/0x8c0 drivers/scsi/sg.c:774 |
| sg_ioctl_common+0x14d6/0x2710 drivers/scsi/sg.c:939 |
| sg_ioctl+0xa2/0x180 drivers/scsi/sg.c:1165 |
| vfs_ioctl fs/ioctl.c:51 [inline] |
| __do_sys_ioctl fs/ioctl.c:874 [inline] |
| __se_sys_ioctl fs/ioctl.c:860 [inline] |
| __x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:860 |
| do_syscall_x64 arch/x86/entry/common.c:50 [inline] |
| do_syscall_64+0x3a/0x80 arch/x86/entry/common.c:80 |
| entry_SYSCALL_64_after_hwframe+0x44/0xae |
| |
| The Linux kernel CVE team has assigned CVE-2021-47580 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.88 with commit bdb854f134b964528fa543e0351022eb45bd7346 |
| Fixed in 5.15.11 with commit 3085147645938eb41f0bc0e25ef9791e71f5ee4b |
| Fixed in 5.16 with commit 36e07d7ede88a1f1ef8f0f209af5b7612324ac2c |
| |
| 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-2021-47580 |
| 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/bdb854f134b964528fa543e0351022eb45bd7346 |
| https://git.kernel.org/stable/c/3085147645938eb41f0bc0e25ef9791e71f5ee4b |
| https://git.kernel.org/stable/c/36e07d7ede88a1f1ef8f0f209af5b7612324ac2c |
