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Zheng Yejian 8d91bdca2f x86/unwind/orc: Fix unwind for newly forked tasks 
[ Upstream commit 3bf19a0fb6 ]

When arch_stack_walk_reliable() is called to unwind for newly forked
tasks, the return value is negative which means the call stack is
unreliable. This obviously does not meet expectations.

The root cause is that after commit 3aec4ecb3d ("x86: Rewrite
 ret_from_fork() in C"), the 'ret_addr' of newly forked task is changed
to 'ret_from_fork_asm' (see copy_thread()), then at the start of the
unwind, it is incorrectly interprets not as a "signal" one because
'ret_from_fork' is still used to determine the initial "signal" (see
__unwind_start()). Then the address gets incorrectly decremented in the
call to orc_find() (see unwind_next_frame()) and resulting in the
incorrect ORC data.

To fix it, check 'ret_from_fork_asm' rather than 'ret_from_fork' in
__unwind_start().

Fixes: 3aec4ecb3d ("x86: Rewrite ret_from_fork() in C")
Signed-off-by: Zheng Yejian <zhengyejian@huaweicloud.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-12-09 10:31:50 +01:00
arch x86/unwind/orc: Fix unwind for newly forked tasks 2024-12-09 10:31:50 +01:00
block block: fix bio_split_rw_at to take zone_write_granularity into account 2024-12-09 10:31:45 +01:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: pcrypt - Call crypto layer directly when padata_do_parallel() return -EBUSY 2024-12-09 10:31:48 +01:00
Documentation doc: rcu: update printed dynticks counter bits 2024-12-09 10:31:48 +01:00
drivers crypto: cavium - Fix an error handling path in cpt_ucode_load_fw() 2024-12-09 10:31:50 +01:00
fs ext4: fix race in buffer_head read fault injection 2024-12-09 10:31:46 +01:00
include crypto: hisilicon/qm - disable same error report before resetting 2024-12-09 10:31:48 +01:00
init initramfs: avoid filename buffer overrun 2024-12-09 10:31:44 +01:00
io_uring io_uring: fix possible deadlock in io_register_iowq_max_workers() 2024-11-17 15:08:58 +01:00
ipc sysctl: treewide: drop unused argument ctl_table_root::set_ownership(table) 2024-08-11 12:47:13 +02:00
kernel rcuscale: Do a proper cleanup if kfree_scale_init() fails 2024-12-09 10:31:50 +01:00
lib lib/buildid: Fix build ID parsing logic 2024-11-22 15:38:36 +01:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/damon/core: copy nr_accesses when splitting region 2024-11-22 15:38:37 +01:00
net mptcp: fix possible integer overflow in mptcp_reset_tout_timer 2024-12-09 10:31:42 +01:00
rust rust: sync: require T: Sync for LockedBy::access 2024-10-10 11:57:44 +02:00
samples samples: pktgen: correct dev to DEV 2024-11-22 15:38:32 +01:00
scripts kconfig: qconf: fix buffer overflow in debug links 2024-10-10 11:58:01 +02:00
security ima: fix buffer overrun in ima_eventdigest_init_common 2024-11-22 15:38:34 +01:00
sound ALSA: usb-audio: Fix Yamaha P-125 Quirk Entry 2024-12-09 10:31:40 +01:00
tools thermal/lib: Fix memory leak on error in thermal_genl_auto() 2024-12-09 10:31:50 +01:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt KVM: Use dedicated mutex to protect kvm_usage_count to avoid deadlock 2024-10-04 16:29:47 +02:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.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 Remove *.orig pattern from .gitignore 2024-10-04 16:29:44 +02:00
.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 membarrier: riscv: Add full memory barrier in switch_mm() 2024-09-12 11:11:45 +02:00
Makefile Linux 6.6.63 2024-11-22 15:38:37 +01:00
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.