CVE-2021-47219

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