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Manish Rangankar fa85b016a5 scsi: qedi: Fix crash while reading debugfs attribute 
[ Upstream commit 28027ec8e3 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-06-27 13:49:01 +02:00
arch riscv: rewrite __kernel_map_pages() to fix sleeping in invalid context 2024-06-21 14:38:42 +02:00
block block/ioctl: prefer different overflow check 2024-06-27 13:49:01 +02:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: ecrdsa - Fix module auto-load on add_key 2024-06-16 13:47:39 +02:00
Documentation mm: fix race between __split_huge_pmd_locked() and GUP-fast 2024-06-16 13:47:40 +02:00
drivers scsi: qedi: Fix crash while reading debugfs attribute 2024-06-27 13:49:01 +02:00
fs fs/writeback: bail out if there is no more inodes for IO and queued once 2024-06-27 13:49:00 +02:00
include serial: port: Introduce a common helper to read properties 2024-06-21 14:38:49 +02:00
init smp: Provide 'setup_max_cpus' definition on UP too 2024-06-16 13:47:49 +02:00
io_uring io_uring/sqpoll: work around a potential audit memory leak 2024-06-27 13:49:01 +02:00
ipc Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
kernel rcutorture: Fix invalid context warning when enable srcu barrier testing 2024-06-27 13:49:01 +02:00
lib lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure 2024-06-12 11:12:08 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/huge_memory: don't unpoison huge_zero_folio 2024-06-21 14:38:46 +02:00
net drop_monitor: replace spin_lock by raw_spin_lock 2024-06-27 13:49:01 +02:00
rust rust: kernel: require Send for Module implementations 2024-05-17 12:01:56 +02:00
samples work around gcc bugs with 'asm goto' with outputs 2024-02-23 09:24:47 +01:00
scripts modpost: do not warn about missing MODULE_DESCRIPTION() for vmlinux.o 2024-06-21 14:38:32 +02:00
security ima: Fix use-after-free on a dentry's dname.name 2024-06-21 14:38:48 +02:00
sound ALSA: seq: Fix incorrect UMP type for system messages 2024-06-16 13:47:48 +02:00
tools selftests/bpf: Fix flaky test btf_map_in_map/lookup_update 2024-06-27 13:49:01 +02:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt KVM: Always flush async #PF workqueue when vCPU is being destroyed 2024-04-03 15:28:18 +02:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: rename binkernel.spec to kernel.spec 2023-07-25 00:59:33 +09:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS pwm: Rename pwm_apply_state() to pwm_apply_might_sleep() 2024-06-12 11:12:24 +02:00
Makefile Linux 6.6.35 2024-06-21 14:38:50 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.