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Max Kellermann 6ad9643aa5 fs/netfs/read_pgpriv2: skip folio queues without marks3 
[ Note this patch doesn't apply to v6.14 as it was obsoleted by commit
  e2d46f2ec3 ("netfs: Change the read result collector to only use one
  work item"). ]

At the beginning of the function, folio queues with marks3==0 are
skipped, but after that, the `marks3` field is ignored.  If one such
queue is found, `slot` is set to 64 (because `__ffs(0)==64`), leading
to a buffer overflow in the folioq_folio() call.  The resulting crash
may look like this:

 BUG: kernel NULL pointer dereference, address: 0000000000000000
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 0 P4D 0
 Oops: Oops: 0000 [#1] SMP PTI
 CPU: 11 UID: 0 PID: 2909 Comm: kworker/u262:1 Not tainted 6.13.1-cm4all2-vm #415
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014
 Workqueue: events_unbound netfs_read_termination_worker
 RIP: 0010:netfs_pgpriv2_write_to_the_cache+0x15a/0x3f0
 Code: 48 85 c0 48 89 44 24 08 0f 84 24 01 00 00 48 8b 80 40 01 00 00 48 8b 7c 24 08 f3 48 0f bc c0 89 44 24 18 89 c0 48 8b 74 c7 08 <48> 8b 06 48 c7 04 24 00 10 00 00 a8 40 74 10 0f b6 4e 40 b8 00 10
 RSP: 0018:ffffbbc440effe18 EFLAGS: 00010203
 RAX: 0000000000000040 RBX: ffff96f8fc034000 RCX: 0000000000000000
 RDX: 0000000000000040 RSI: 0000000000000000 RDI: ffff96f8fc036400
 RBP: 0000000000001000 R08: ffff96f9132bb400 R09: 0000000000001000
 R10: ffff96f8c1263c80 R11: 0000000000000003 R12: 0000000000001000
 R13: ffff96f8fb75ade8 R14: fffffaaf5ca90000 R15: ffff96f8fb75ad00
 FS:  0000000000000000(0000) GS:ffff9703cf0c0000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000000 CR3: 000000010c9ca003 CR4: 00000000001706b0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 Call Trace:
  <TASK>
  ? __die+0x1f/0x60
  ? page_fault_oops+0x158/0x450
  ? search_extable+0x22/0x30
  ? netfs_pgpriv2_write_to_the_cache+0x15a/0x3f0
  ? search_module_extables+0xe/0x40
  ? exc_page_fault+0x62/0x120
  ? asm_exc_page_fault+0x22/0x30
  ? netfs_pgpriv2_write_to_the_cache+0x15a/0x3f0
  ? netfs_pgpriv2_write_to_the_cache+0xf6/0x3f0
  netfs_read_termination_worker+0x1f/0x60
  process_one_work+0x138/0x2d0
  worker_thread+0x2a5/0x3b0
  ? __pfx_worker_thread+0x10/0x10
  kthread+0xba/0xe0
  ? __pfx_kthread+0x10/0x10
  ret_from_fork+0x30/0x50
  ? __pfx_kthread+0x10/0x10
  ret_from_fork_asm+0x1a/0x30
  </TASK>

Fixes: ee4cdf7ba8 ("netfs: Speed up buffered reading")
Cc: stable@vger.kernel.org
Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-03-13 13:02:18 +01:00
arch arm64: hugetlb: Fix huge_ptep_get_and_clear() for non-present ptes 2025-03-13 13:02:17 +01:00
block block: fix conversion of GPT partition name to 7-bit 2025-03-13 13:01:58 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: api - Fix boot-up self-test race 2025-02-08 09:57:28 +01:00
Documentation coredump: Only sort VMAs when core_sort_vma sysctl is set 2025-03-13 13:02:01 +01:00
drivers iio: adc: at91-sama5d2_adc: fix sama7g5 realbits value 2025-03-13 13:02:17 +01:00
fs fs/netfs/read_pgpriv2: skip folio queues without marks3 2025-03-13 13:02:18 +01:00
include mm: hugetlb: Add huge page size param to huge_ptep_get_and_clear() 2025-03-13 13:02:17 +01:00
init Compiler Attributes: disable __counted_by for clang < 19.1.3 2024-12-05 14:02:45 +01:00
io_uring io_uring/net: save msg_control for compat 2025-03-07 18:25:35 +01:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-05 14:03:02 +01:00
kernel sched/fair: Fix potential memory corruption in child_cfs_rq_on_list 2025-03-13 13:02:09 +01:00
lib rcuref: Plug slowpath race in rcuref_put() 2025-03-07 18:25:43 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm: hugetlb: Add huge page size param to huge_ptep_get_and_clear() 2025-03-13 13:02:17 +01:00
net net: ipv6: fix missing dst ref drop in ila lwtunnel 2025-03-13 13:02:09 +01:00
rust rust: map long to isize and char to u8 2025-03-13 13:02:13 +01:00
samples rust: treewide: switch to the kernel Vec type 2025-03-13 13:01:46 +01:00
scripts kbuild: rust: remove the alloc crate and GlobalAlloc 2025-03-13 13:01:47 +01:00
security ima: Reset IMA_NONACTION_RULE_FLAGS after post_setattr 2025-03-07 18:25:44 +01:00
sound ALSA: usx2y: validate nrpacks module parameter on probe 2025-03-13 13:02:05 +01:00
tools selftests/damon/damon_nr_regions: sort collected regiosn before checking with min/max boundaries 2025-03-13 13:01:57 +01:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt KVM: x86: switch hugepage recovery thread to vhost_task 2024-12-05 14:02:43 +01:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: enable Clippy's check-private-items 2025-03-13 13:01:42 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.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 MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
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 MAINTAINERS: add entry for the Rust alloc module 2025-03-13 13:01:47 +01:00
Makefile kbuild: userprogs: use correct lld when linking through clang 2025-03-13 13:02:12 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -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 reStructuredText 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.