On 10:15 Thu 20 Mar , Song Liu wrote: > This is largely based on [1] by Suraj Jitindar Singh. > > Test coverage: > > - Passed manual tests with samples/livepatch. > - Passed all but test-kprobe.sh in selftests/livepatch. > test-kprobe.sh is expected to fail, because arm64 doesn't have > KPROBES_ON_FTRACE. > - Passed tests with kpatch-build [2]. (This version includes commits that > are not merged to upstream kpatch yet). > > [1] https://lore.kernel.org/all/20210604235930.603-1-sura...@amazon.com/ > [2] https://github.com/liu-song-6/kpatch/tree/fb-6.13 > Cc: Suraj Jitindar Singh <sura...@amazon.com> > Cc: Torsten Duwe <d...@suse.de> > Signed-off-by: Song Liu <s...@kernel.org> > Acked-by: Miroslav Benes <mbe...@suse.cz> > Tested-by: Breno Leitao <lei...@debian.org> > --- > arch/arm64/Kconfig | 3 +++ > arch/arm64/include/asm/thread_info.h | 4 +++- > arch/arm64/kernel/entry-common.c | 4 ++++ > 3 files changed, 10 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 31d5e1ee6089..dbd237b13b21 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -277,6 +277,7 @@ config ARM64 > select USER_STACKTRACE_SUPPORT > select VDSO_GETRANDOM > select HAVE_RELIABLE_STACKTRACE > + select HAVE_LIVEPATCH > help > ARM 64-bit (AArch64) Linux support. > > @@ -2501,3 +2502,5 @@ endmenu # "CPU Power Management" > source "drivers/acpi/Kconfig" > > source "arch/arm64/kvm/Kconfig" > + > +source "kernel/livepatch/Kconfig" > diff --git a/arch/arm64/include/asm/thread_info.h > b/arch/arm64/include/asm/thread_info.h > index 1114c1c3300a..4ac42e13032b 100644 > --- a/arch/arm64/include/asm/thread_info.h > +++ b/arch/arm64/include/asm/thread_info.h > @@ -64,6 +64,7 @@ void arch_setup_new_exec(void); > #define TIF_UPROBE 4 /* uprobe breakpoint or singlestep */ > #define TIF_MTE_ASYNC_FAULT 5 /* MTE Asynchronous Tag Check Fault */ > #define TIF_NOTIFY_SIGNAL 6 /* signal notifications exist */ > +#define TIF_PATCH_PENDING 7 /* pending live patching update */ > #define TIF_SYSCALL_TRACE 8 /* syscall trace active */ > #define TIF_SYSCALL_AUDIT 9 /* syscall auditing */ > #define TIF_SYSCALL_TRACEPOINT 10 /* syscall tracepoint for > ftrace */ > @@ -92,6 +93,7 @@ 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) > @@ -103,7 +105,7 @@ void arch_setup_new_exec(void); > #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ > _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \ > _TIF_UPROBE | _TIF_MTE_ASYNC_FAULT | \ > - _TIF_NOTIFY_SIGNAL) > + _TIF_NOTIFY_SIGNAL | _TIF_PATCH_PENDING) > > #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ > _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \ > diff --git a/arch/arm64/kernel/entry-common.c > b/arch/arm64/kernel/entry-common.c > index b260ddc4d3e9..b537af333b42 100644 > --- a/arch/arm64/kernel/entry-common.c > +++ b/arch/arm64/kernel/entry-common.c > @@ -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); > > -- > 2.47.1 >
Tested-by: Andrea della Porta <andrea.po...@suse.com> Thanks, Andrea
