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arm64: Implement HAVE_LIVEPATCH

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Allocate a task flag used to represent the patch pending state for the
task. When a livepatch is being loaded or unloaded, the livepatch code
uses this flag to select the proper version of a being patched kernel
functions to use for current task.

In arch/arm64/Kconfig, select HAVE_LIVEPATCH and include proper Kconfig.

This is largely based on [1] by Suraj Jitindar Singh.

[1] https://lore.kernel.org/all/20210604235930.603-1-surajjs@amazon.com/

Cc: Suraj Jitindar Singh <surajjs@amazon.com>
Cc: Torsten Duwe <duwe@suse.de>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Tested-by: Breno Leitao <leitao@debian.org>
Tested-by: Andrea della Porta <andrea.porta@suse.com>
Signed-off-by: Song Liu <song@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20250630174502.842486-1-song@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Song Liu 2025-06-30 10:45:02 -07:00 committed by Catalin Marinas
parent 805f13e403
commit fd1e0fd71f
3 changed files with 11 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm64/Kconfig
View File

@ -280,6 +280,7 @@ config ARM64
select USER_STACKTRACE_SUPPORT
select VDSO_GETRANDOM
select HAVE_RELIABLE_STACKTRACE
select HAVE_LIVEPATCH
help
ARM 64-bit (AArch64) Linux support.
@ -2499,3 +2500,5 @@ endmenu # "CPU Power Management"
source "drivers/acpi/Kconfig"
source "arch/arm64/kvm/Kconfig"
source "kernel/livepatch/Kconfig"

5
arch/arm64/include/asm/thread_info.h
View File

@ -70,6 +70,7 @@ void arch_setup_new_exec(void);
#define TIF_SYSCALL_TRACEPOINT 10 /* syscall tracepoint for ftrace */
#define TIF_SECCOMP 11 /* syscall secure computing */
#define TIF_SYSCALL_EMU 12 /* syscall emulation active */
#define TIF_PATCH_PENDING 13 /* pending live patching update */
#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
#define TIF_FREEZE 19
#define TIF_RESTORE_SIGMASK 20
@ -96,6 +97,7 @@ void arch_setup_new_exec(void);
#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
#define _TIF_SECCOMP (1 << TIF_SECCOMP)
#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
#define _TIF_PATCH_PENDING (1 << TIF_PATCH_PENDING)
#define _TIF_UPROBE (1 << TIF_UPROBE)
#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
#define _TIF_32BIT (1 << TIF_32BIT)
@ -107,7 +109,8 @@ void arch_setup_new_exec(void);
#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY | \
_TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \
_TIF_UPROBE | _TIF_MTE_ASYNC_FAULT | \
_TIF_NOTIFY_SIGNAL | _TIF_SIGPENDING)
_TIF_NOTIFY_SIGNAL | _TIF_SIGPENDING | \
_TIF_PATCH_PENDING)
#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
_TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \

4
arch/arm64/kernel/entry-common.c
View File

@ -8,6 +8,7 @@
#include <linux/context_tracking.h>
#include <linux/kasan.h>
#include <linux/linkage.h>
#include <linux/livepatch.h>
#include <linux/lockdep.h>
#include <linux/ptrace.h>
#include <linux/resume_user_mode.h>
@ -144,6 +145,9 @@ static void do_notify_resume(struct pt_regs *regs, unsigned long thread_flags)
(void __user *)NULL, current);
}
if (thread_flags & _TIF_PATCH_PENDING)
klp_update_patch_state(current);
if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
do_signal(regs);