Peter Zijlstra 2e7e5bbb1c x86: Fix kthread unwind ...

The rewrite of ret_from_form() misplaced an unwind hint which caused
all kthread stack unwinds to be marked unreliable, breaking
livepatching.

Restore the annotation and add a comment to explain the how and why of
things.

Fixes: 3aec4ecb3d1f ("x86: Rewrite ret_from_fork() in C")
Reported-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Petr Mladek <pmladek@suse.com>
Link: https://lkml.kernel.org/r/20230719201538.GA3553016@hirez.programming.kicks-ass.net

2023-07-20 23:03:50 +02:00

..

syscalls

cachestat: implement cachestat syscall

2023-06-09 16:25:16 -07:00

vdso

x86/vdso: Include vdso/processor.h

2023-05-18 11:56:18 -07:00

vsyscall

x86: Allow atomic MM_CONTEXT flags setting

2023-03-16 13:08:39 -07:00

calling.h

x86/retbleed: Add fine grained Kconfig knobs

2022-06-29 17:43:41 +02:00

common.c

X86 entry code related updates:

2021-06-29 12:44:51 -07:00

entry_32.S

x86: Rewrite ret_from_fork() in C

2023-07-10 09:52:25 +02:00

entry_64_compat.S

- Add the call depth tracking mitigation for Retbleed which has

2022-12-14 15:03:00 -08:00

entry_64.S

x86: Fix kthread unwind

2023-07-20 23:03:50 +02:00

entry.S

x86/bugs: Add retbleed=ibpb

2022-06-27 10:34:00 +02:00

Makefile

x86/entry: Build thunk_$(BITS) only if CONFIG_PREEMPTION=y

2022-08-04 12:23:50 +02:00

syscall_32.c

x86/syscalls: Stop filling syscall arrays with *_sys_ni_syscall

2021-05-20 15:03:59 +02:00

syscall_64.c

x86/syscalls: Stop filling syscall arrays with *_sys_ni_syscall

2021-05-20 15:03:59 +02:00

syscall_x32.c

x86/syscalls: Stop filling syscall arrays with *_sys_ni_syscall

2021-05-20 15:03:59 +02:00

thunk_32.S

x86/entry: Build thunk_$(BITS) only if CONFIG_PREEMPTION=y

2022-08-04 12:23:50 +02:00

thunk_64.S

x86/entry: Move thunk restore code into thunk functions

2023-06-07 09:54:45 -07:00