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Andrey Ryabinin ec8d0ee880 stackdepot: respect __GFP_NOLOCKDEP allocation flag 
commit 6fe60465e1 upstream.

If stack_depot_save_flags() allocates memory it always drops
__GFP_NOLOCKDEP flag.  So when KASAN tries to track __GFP_NOLOCKDEP
allocation we may end up with lockdep splat like bellow:

======================================================
 WARNING: possible circular locking dependency detected
 6.9.0-rc3+ #49 Not tainted
 ------------------------------------------------------
 kswapd0/149 is trying to acquire lock:
 ffff88811346a920
(&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_reclaim_inode+0x3ac/0x590
[xfs]

 but task is already holding lock:
 ffffffff8bb33100 (fs_reclaim){+.+.}-{0:0}, at:
balance_pgdat+0x5d9/0xad0

 which lock already depends on the new lock.

 the existing dependency chain (in reverse order) is:
 -> #1 (fs_reclaim){+.+.}-{0:0}:
        __lock_acquire+0x7da/0x1030
        lock_acquire+0x15d/0x400
        fs_reclaim_acquire+0xb5/0x100
 prepare_alloc_pages.constprop.0+0xc5/0x230
        __alloc_pages+0x12a/0x3f0
        alloc_pages_mpol+0x175/0x340
        stack_depot_save_flags+0x4c5/0x510
        kasan_save_stack+0x30/0x40
        kasan_save_track+0x10/0x30
        __kasan_slab_alloc+0x83/0x90
        kmem_cache_alloc+0x15e/0x4a0
        __alloc_object+0x35/0x370
        __create_object+0x22/0x90
 __kmalloc_node_track_caller+0x477/0x5b0
        krealloc+0x5f/0x110
        xfs_iext_insert_raw+0x4b2/0x6e0 [xfs]
        xfs_iext_insert+0x2e/0x130 [xfs]
        xfs_iread_bmbt_block+0x1a9/0x4d0 [xfs]
        xfs_btree_visit_block+0xfb/0x290 [xfs]
        xfs_btree_visit_blocks+0x215/0x2c0 [xfs]
        xfs_iread_extents+0x1a2/0x2e0 [xfs]
 xfs_buffered_write_iomap_begin+0x376/0x10a0 [xfs]
        iomap_iter+0x1d1/0x2d0
 iomap_file_buffered_write+0x120/0x1a0
        xfs_file_buffered_write+0x128/0x4b0 [xfs]
        vfs_write+0x675/0x890
        ksys_write+0xc3/0x160
        do_syscall_64+0x94/0x170
 entry_SYSCALL_64_after_hwframe+0x71/0x79

Always preserve __GFP_NOLOCKDEP to fix this.

Link: https://lkml.kernel.org/r/20240418141133.22950-1-ryabinin.a.a@gmail.com
Fixes: cd11016e5f ("mm, kasan: stackdepot implementation. Enable stackdepot for SLAB")
Signed-off-by: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Reported-by: Xiubo Li <xiubli@redhat.com>
Closes: https://lore.kernel.org/all/a0caa289-ca02-48eb-9bf2-d86fd47b71f4@redhat.com/
Reported-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Closes: https://lore.kernel.org/all/f9ff999a-e170-b66b-7caf-293f2b147ac2@opensource.wdc.com/
Suggested-by: Dave Chinner <david@fromorbit.com>
Tested-by: Xiubo Li <xiubli@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Alexander Potapenko <glider@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2024-05-02 16:24:49 +02:00
Documentation Revert "lockd: introduce safe async lock op" 2024-04-27 17:05:23 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
arch arm64: dts: rockchip: enable internal pull-up for Q7_THRM# on RK3399 Puma 2024-05-02 16:24:48 +02:00
block block: prevent division by zero in blk_rq_stat_sum() 2024-04-13 13:01:45 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto Revert "crypto: api - Disallow identical driver names" 2024-05-02 16:24:47 +02:00
drivers net: b44: set pause params only when interface is up 2024-05-02 16:24:49 +02:00
fs btrfs: fix information leak in btrfs_ioctl_logical_to_ino() 2024-05-02 16:24:48 +02:00
include ethernet: Add helper for assigning packet type when dest address does not match device address 2024-05-02 16:24:49 +02:00
init init/main.c: Fix potential static_command_line memory overflow 2024-04-27 17:05:28 +02:00
io_uring io_uring: ensure '0' is returned on file registration success 2024-04-10 16:19:37 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:28:45 +01:00
kernel cpu: Re-enable CPU mitigations by default for !X86 architectures 2024-05-02 16:24:48 +02:00
lib stackdepot: respect __GFP_NOLOCKDEP allocation flag 2024-05-02 16:24:49 +02:00
mm x86/mm/pat: fix VM_PAT handling in COW mappings 2024-04-13 13:01:47 +02:00
net ethernet: Add helper for assigning packet type when dest address does not match device address 2024-05-02 16:24:49 +02:00
samples samples/hw_breakpoint: fix building without module unloading 2023-09-23 11:10:01 +02:00
scripts gcc-plugins/stackleak: Avoid .head.text section 2024-04-13 13:01:47 +02:00
security landlock: Warn once if a Landlock action is requested while disabled 2024-04-10 16:18:39 +02:00
sound ASoC: soc-core.c: Skip dummy codec when adding platforms 2024-04-13 13:01:46 +02:00
tools selftests/ftrace: Limit length in subsystem-enable tests 2024-04-27 17:05:23 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: Always flush async #PF workqueue when vCPU is being destroyed 2024-04-10 16:18:34 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
…
.get_maintainer.ignore
…
.gitattributes
…
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS trace: Relocate event helper files 2024-04-10 16:19:24 +02:00
Makefile Linux 5.15.157 2024-04-27 17:05:29 +02:00
README
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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.