CVE-2021-47219

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> scsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs()<br /> <br /> The following issue was observed running syzkaller:<br /> <br /> BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:377 [inline]<br /> BUG: KASAN: slab-out-of-bounds in sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831<br /> Read of size 2132 at addr ffff8880aea95dc8 by task syz-executor.0/9815<br /> <br /> CPU: 0 PID: 9815 Comm: syz-executor.0 Not tainted 4.19.202-00874-gfc0fe04215a9 #2<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014<br /> Call Trace:<br /> __dump_stack lib/dump_stack.c:77 [inline]<br /> dump_stack+0xe4/0x14a lib/dump_stack.c:118<br /> print_address_description+0x73/0x280 mm/kasan/report.c:253<br /> kasan_report_error mm/kasan/report.c:352 [inline]<br /> kasan_report+0x272/0x370 mm/kasan/report.c:410<br /> memcpy+0x1f/0x50 mm/kasan/kasan.c:302<br /> memcpy include/linux/string.h:377 [inline]<br /> sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831<br /> fill_from_dev_buffer+0x14f/0x340 drivers/scsi/scsi_debug.c:1021<br /> resp_report_tgtpgs+0x5aa/0x770 drivers/scsi/scsi_debug.c:1772<br /> schedule_resp+0x464/0x12f0 drivers/scsi/scsi_debug.c:4429<br /> scsi_debug_queuecommand+0x467/0x1390 drivers/scsi/scsi_debug.c:5835<br /> scsi_dispatch_cmd+0x3fc/0x9b0 drivers/scsi/scsi_lib.c:1896<br /> scsi_request_fn+0x1042/0x1810 drivers/scsi/scsi_lib.c:2034<br /> __blk_run_queue_uncond block/blk-core.c:464 [inline]<br /> __blk_run_queue+0x1a4/0x380 block/blk-core.c:484<br /> blk_execute_rq_nowait+0x1c2/0x2d0 block/blk-exec.c:78<br /> sg_common_write.isra.19+0xd74/0x1dc0 drivers/scsi/sg.c:847<br /> sg_write.part.23+0x6e0/0xd00 drivers/scsi/sg.c:716<br /> sg_write+0x64/0xa0 drivers/scsi/sg.c:622<br /> __vfs_write+0xed/0x690 fs/read_write.c:485<br /> kill_bdev:block_device:00000000e138492c<br /> vfs_write+0x184/0x4c0 fs/read_write.c:549<br /> ksys_write+0x107/0x240 fs/read_write.c:599<br /> do_syscall_64+0xc2/0x560 arch/x86/entry/common.c:293<br /> entry_SYSCALL_64_after_hwframe+0x49/0xbe<br /> <br /> We get &amp;#39;alen&amp;#39; from command its type is int. If userspace passes a large<br /> length we will get a negative &amp;#39;alen&amp;#39;.<br /> <br /> Switch n, alen, and rlen to u32.