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linux/drivers/scsi/qedi
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Manish Rangankar 28027ec8e3 scsi: qedi: Fix crash while reading debugfs attribute 
The qedi_dbg_do_not_recover_cmd_read() function invokes sprintf() directly
on a __user pointer, which results into the crash.

To fix this issue, use a small local stack buffer for sprintf() and then
call simple_read_from_buffer(), which in turns make the copy_to_user()
call.

BUG: unable to handle page fault for address: 00007f4801111000
PGD 8000000864df6067 P4D 8000000864df6067 PUD 864df7067 PMD 846028067 PTE 0
Oops: 0002 [#1] PREEMPT SMP PTI
Hardware name: HPE ProLiant DL380 Gen10/ProLiant DL380 Gen10, BIOS U30 06/15/2023
RIP: 0010:memcpy_orig+0xcd/0x130
RSP: 0018:ffffb7a18c3ffc40 EFLAGS: 00010202
RAX: 00007f4801111000 RBX: 00007f4801111000 RCX: 000000000000000f
RDX: 000000000000000f RSI: ffffffffc0bfd7a0 RDI: 00007f4801111000
RBP: ffffffffc0bfd7a0 R08: 725f746f6e5f6f64 R09: 3d7265766f636572
R10: ffffb7a18c3ffd08 R11: 0000000000000000 R12: 00007f4881110fff
R13: 000000007fffffff R14: ffffb7a18c3ffca0 R15: ffffffffc0bfd7af
FS:  00007f480118a740(0000) GS:ffff98e38af00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4801111000 CR3: 0000000864b8e001 CR4: 00000000007706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 <TASK>
 ? __die_body+0x1a/0x60
 ? page_fault_oops+0x183/0x510
 ? exc_page_fault+0x69/0x150
 ? asm_exc_page_fault+0x22/0x30
 ? memcpy_orig+0xcd/0x130
 vsnprintf+0x102/0x4c0
 sprintf+0x51/0x80
 qedi_dbg_do_not_recover_cmd_read+0x2f/0x50 [qedi 6bcfdeeecdea037da47069eca2ba717c84a77324]
 full_proxy_read+0x50/0x80
 vfs_read+0xa5/0x2e0
 ? folio_add_new_anon_rmap+0x44/0xa0
 ? set_pte_at+0x15/0x30
 ? do_pte_missing+0x426/0x7f0
 ksys_read+0xa5/0xe0
 do_syscall_64+0x58/0x80
 ? __count_memcg_events+0x46/0x90
 ? count_memcg_event_mm+0x3d/0x60
 ? handle_mm_fault+0x196/0x2f0
 ? do_user_addr_fault+0x267/0x890
 ? exc_page_fault+0x69/0x150
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f4800f20b4d

Tested-by: Martin Hoyer <mhoyer@redhat.com>
Reviewed-by: John Meneghini <jmeneghi@redhat.com>
Signed-off-by: Manish Rangankar <mrangankar@marvell.com>
Link: https://lore.kernel.org/r/20240415072155.30840-1-mrangankar@marvell.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2024-04-24 21:09:08 -04:00
..
Kconfig
Makefile
qedi_dbg.c
qedi_dbg.h scsi: qedi: Remove unneeded version.h include 2023-02-21 22:00:51 -05:00
qedi_debugfs.c scsi: qedi: Fix crash while reading debugfs attribute 2024-04-24 21:09:08 -04:00
qedi_fw_api.c qed: Remove e4_ and _e4 from FW HSI 2021-10-04 12:55:48 +01:00
qedi_fw_iscsi.h qed: Remove e4_ and _e4 from FW HSI 2021-10-04 12:55:48 +01:00
qedi_fw_scsi.h
qedi_fw.c SCSI misc on 20220324 2022-03-24 19:37:53 -07:00
qedi_gbl.h scsi: qedi: Remove unused declarations 2023-08-24 22:09:04 -04:00
qedi_hsi.h
qedi_iscsi.c scsi: iscsi: Declare SCSI host template const 2023-03-24 19:19:57 -04:00
qedi_iscsi.h scsi: qedi: Fix cmd_cleanup_cmpl counter mismatch issue 2021-12-06 22:00:54 -05:00
qedi_main.c scsi: qedi: Fix firmware halt over suspend and resume 2023-08-07 21:34:08 -04:00
qedi_nvm_iscsi_cfg.h
qedi_sysfs.c scsi: qedi: Switch to attribute groups 2021-10-16 21:45:58 -04:00
qedi_version.h
qedi.h scsi: qedi: Fix cleanup session block/unblock use 2021-06-02 01:28:23 -04:00