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Date: Fri, 5 Nov 2021 20:20:56 -0400
From: Douglas Gilbert <dgilbert@...erlog.com>
To: George Kennedy <george.kennedy@...cle.com>,
gregkh@...uxfoundation.org, jejb@...ux.ibm.com,
martin.petersen@...cle.com
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 linux-next] scsi: scsi_debug: fix type in min_t to
avoid stack OOB
On 2021-11-05 11:10 a.m., George Kennedy wrote:
> 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
>
> Reported-by: syzkaller <syzkaller@...glegroups.com>
> Signed-off-by: George Kennedy <george.kennedy@...cle.com>
Acked-by: Douglas Gilbert <dgilbert@...erlog.com>
> ---
> drivers/scsi/scsi_debug.c | 27 +++++++++++++++------------
> 1 file changed, 15 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
> index 06e7266..3b5ee42 100644
> --- a/drivers/scsi/scsi_debug.c
> +++ b/drivers/scsi/scsi_debug.c
> @@ -1189,7 +1189,7 @@ static int p_fill_from_dev_buffer(struct scsi_cmnd *scp, const void *arr,
> __func__, off_dst, scsi_bufflen(scp), act_len,
> scsi_get_resid(scp));
> n = scsi_bufflen(scp) - (off_dst + act_len);
> - scsi_set_resid(scp, min_t(int, scsi_get_resid(scp), n));
> + scsi_set_resid(scp, min_t(u32, scsi_get_resid(scp), n));
> return 0;
> }
>
> @@ -1562,7 +1562,8 @@ static int resp_inquiry(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
> unsigned char pq_pdt;
> unsigned char *arr;
> unsigned char *cmd = scp->cmnd;
> - int alloc_len, n, ret;
> + u32 alloc_len, n;
> + int ret;
> bool have_wlun, is_disk, is_zbc, is_disk_zbc;
>
> alloc_len = get_unaligned_be16(cmd + 3);
> @@ -1714,7 +1715,7 @@ static int resp_inquiry(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
> }
> put_unaligned_be16(0x2100, arr + n); /* SPL-4 no version claimed */
> ret = fill_from_dev_buffer(scp, arr,
> - min_t(int, alloc_len, SDEBUG_LONG_INQ_SZ));
> + min_t(u32, alloc_len, SDEBUG_LONG_INQ_SZ));
> kfree(arr);
> return ret;
> }
> @@ -1729,8 +1730,8 @@ static int resp_requests(struct scsi_cmnd *scp,
> unsigned char *cmd = scp->cmnd;
> unsigned char arr[SCSI_SENSE_BUFFERSIZE]; /* assume >= 18 bytes */
> bool dsense = !!(cmd[1] & 1);
> - int alloc_len = cmd[4];
> - int len = 18;
> + u32 alloc_len = cmd[4];
> + u32 len = 18;
> int stopped_state = atomic_read(&devip->stopped);
>
> memset(arr, 0, sizeof(arr));
> @@ -1774,7 +1775,7 @@ static int resp_requests(struct scsi_cmnd *scp,
> arr[7] = 0xa;
> }
> }
> - return fill_from_dev_buffer(scp, arr, min_t(int, len, alloc_len));
> + return fill_from_dev_buffer(scp, arr, min_t(u32, len, alloc_len));
> }
>
> static int resp_start_stop(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
> @@ -2312,7 +2313,8 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
> {
> int pcontrol, pcode, subpcode, bd_len;
> unsigned char dev_spec;
> - int alloc_len, offset, len, target_dev_id;
> + u32 alloc_len, offset, len;
> + int target_dev_id;
> int target = scp->device->id;
> unsigned char *ap;
> unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
> @@ -2468,7 +2470,7 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
> arr[0] = offset - 1;
> else
> put_unaligned_be16((offset - 2), arr + 0);
> - return fill_from_dev_buffer(scp, arr, min_t(int, alloc_len, offset));
> + return fill_from_dev_buffer(scp, arr, min_t(u32, alloc_len, offset));
> }
>
> #define SDEBUG_MAX_MSELECT_SZ 512
> @@ -2583,7 +2585,8 @@ static int resp_ie_l_pg(unsigned char *arr)
> static int resp_log_sense(struct scsi_cmnd *scp,
> struct sdebug_dev_info *devip)
> {
> - int ppc, sp, pcode, subpcode, alloc_len, len, n;
> + int ppc, sp, pcode, subpcode;
> + u32 alloc_len, len, n;
> unsigned char arr[SDEBUG_MAX_LSENSE_SZ];
> unsigned char *cmd = scp->cmnd;
>
> @@ -2653,9 +2656,9 @@ static int resp_log_sense(struct scsi_cmnd *scp,
> mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1);
> return check_condition_result;
> }
> - len = min_t(int, get_unaligned_be16(arr + 2) + 4, alloc_len);
> + len = min_t(u32, get_unaligned_be16(arr + 2) + 4, alloc_len);
> return fill_from_dev_buffer(scp, arr,
> - min_t(int, len, SDEBUG_MAX_INQ_ARR_SZ));
> + min_t(u32, len, SDEBUG_MAX_INQ_ARR_SZ));
> }
>
> static inline bool sdebug_dev_is_zoned(struct sdebug_dev_info *devip)
> @@ -4426,7 +4429,7 @@ static int resp_report_zones(struct scsi_cmnd *scp,
> put_unaligned_be64(sdebug_capacity - 1, arr + 8);
>
> rep_len = (unsigned long)desc - (unsigned long)arr;
> - ret = fill_from_dev_buffer(scp, arr, min_t(int, alloc_len, rep_len));
> + ret = fill_from_dev_buffer(scp, arr, min_t(u32, alloc_len, rep_len));
>
> fini:
> read_unlock(macc_lckp);
>
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