CVE-2021-47580

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> scsi: scsi_debug: Fix type in min_t to avoid stack OOB<br /> <br /> Change min_t() to use type "u32" instead of type "int" to avoid stack out<br /> of bounds. With min_t() type "int" the values get sign extended and the<br /> larger value gets used causing stack out of bounds.<br /> <br /> BUG: KASAN: stack-out-of-bounds in memcpy include/linux/fortify-string.h:191 [inline]<br /> BUG: KASAN: stack-out-of-bounds in sg_copy_buffer+0x1de/0x240 lib/scatterlist.c:976<br /> Read of size 127 at addr ffff888072607128 by task syz-executor.7/18707<br /> <br /> CPU: 1 PID: 18707 Comm: syz-executor.7 Not tainted 5.15.0-syzk #1<br /> Hardware name: Red Hat KVM, BIOS 1.13.0-2<br /> Call Trace:<br /> __dump_stack lib/dump_stack.c:88 [inline]<br /> dump_stack_lvl+0x89/0xb5 lib/dump_stack.c:106<br /> print_address_description.constprop.9+0x28/0x160 mm/kasan/report.c:256<br /> __kasan_report mm/kasan/report.c:442 [inline]<br /> kasan_report.cold.14+0x7d/0x117 mm/kasan/report.c:459<br /> check_region_inline mm/kasan/generic.c:183 [inline]<br /> kasan_check_range+0x1a3/0x210 mm/kasan/generic.c:189<br /> memcpy+0x23/0x60 mm/kasan/shadow.c:65<br /> memcpy include/linux/fortify-string.h:191 [inline]<br /> sg_copy_buffer+0x1de/0x240 lib/scatterlist.c:976<br /> sg_copy_from_buffer+0x33/0x40 lib/scatterlist.c:1000<br /> fill_from_dev_buffer.part.34+0x82/0x130 drivers/scsi/scsi_debug.c:1162<br /> fill_from_dev_buffer drivers/scsi/scsi_debug.c:1888 [inline]<br /> resp_readcap16+0x365/0x3b0 drivers/scsi/scsi_debug.c:1887<br /> schedule_resp+0x4d8/0x1a70 drivers/scsi/scsi_debug.c:5478<br /> scsi_debug_queuecommand+0x8c9/0x1ec0 drivers/scsi/scsi_debug.c:7533<br /> scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1520 [inline]<br /> scsi_queue_rq+0x16b0/0x2d40 drivers/scsi/scsi_lib.c:1699<br /> blk_mq_dispatch_rq_list+0xb9b/0x2700 block/blk-mq.c:1639<br /> __blk_mq_sched_dispatch_requests+0x28f/0x590 block/blk-mq-sched.c:325<br /> blk_mq_sched_dispatch_requests+0x105/0x190 block/blk-mq-sched.c:358<br /> __blk_mq_run_hw_queue+0xe5/0x150 block/blk-mq.c:1761<br /> __blk_mq_delay_run_hw_queue+0x4f8/0x5c0 block/blk-mq.c:1838<br /> blk_mq_run_hw_queue+0x18d/0x350 block/blk-mq.c:1891<br /> blk_mq_sched_insert_request+0x3db/0x4e0 block/blk-mq-sched.c:474<br /> blk_execute_rq_nowait+0x16b/0x1c0 block/blk-exec.c:62<br /> sg_common_write.isra.18+0xeb3/0x2000 drivers/scsi/sg.c:836<br /> sg_new_write.isra.19+0x570/0x8c0 drivers/scsi/sg.c:774<br /> sg_ioctl_common+0x14d6/0x2710 drivers/scsi/sg.c:939<br /> sg_ioctl+0xa2/0x180 drivers/scsi/sg.c:1165<br /> vfs_ioctl fs/ioctl.c:51 [inline]<br /> __do_sys_ioctl fs/ioctl.c:874 [inline]<br /> __se_sys_ioctl fs/ioctl.c:860 [inline]<br /> __x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:860<br /> do_syscall_x64 arch/x86/entry/common.c:50 [inline]<br /> do_syscall_64+0x3a/0x80 arch/x86/entry/common.c:80<br /> entry_SYSCALL_64_after_hwframe+0x44/0xae