[Crash-utility] Re: arm64: Fix bt command show wrong stacktrace on ramdump source

Hi lijiang and tao, Thanks, the case where IKCONFIG does not exist was indeed not considered before. In file arch/arm64/include/asm/processor.h We can see the "struct ptrauth_keys_kernel" have already been embeded into arm's thread structure. 136 struct thread_struct { 137 struct cpu_context cpu_context; /* cpu context */ ... 159 #ifdef CONFIG_ARM64_PTR_AUTH 160 struct ptrauth_keys_user keys_user; 161 #ifdef CONFIG_ARM64_PTR_AUTH_KERNEL 162 struct ptrauth_keys_kernel keys_kernel; 163 #endif ... 169 }; So your suggestion [1] is a very good idead to dealing with the case that IKCONFIG is not available.

[1] check if the struct ptrauth_keys_kernel exists, eg: STRUCT_SIZE_INIT(ptrauth_keys_kernel, "ptrauth_keys_kernel"); if (VALID_SIZE(ptrauth_keys_kernel) > 0) { if (machdep->machspec->VA_BITS_ACTUAL){ machdep->machspec->CONFIG_ARM64_KERNELPACMASK = GENMASK_UL(63, machdep->machspec->VA_BITS_ACTUAL); } ---< BTW, most of the mobile phone already have IKCONFIG setting as using the google's gki kernel. So we may check IKconfig first , if the checking fail then we try to check if the struct ptrauth_keys_kernel exists should be a much compatible methods?

What's more, the CONFIG_ARM64_PTR_AUTH_KERNEL does depend on CONFIG_ARM64_PTR_AUTH, just checking the CONFIG_ARM64_PTR_AUTH_KERNEL should enough. Origin KCONFIG: 1616 config ARM64_PTR_AUTH_KERNEL 1617 bool "Use pointer authentication for kernel" 1618 default y 1619 depends on ARM64_PTR_AUTH I will change the patch according to our discussion and do the local test first. If any other suggestion, please feel free to let me know. At 2024-07-16 19:20:33, "Tao Liu" <ltao(a)redhat.com&gt; wrote: >Hi Lijiang, > >Thanks for the info. > >On Tue, Jul 16, 2024 at 9:51 PM lijiang <lijiang(a)redhat.com&gt; wrote: >> >> Thank you for the update. >> >> On Mon, Jul 15, 2024 at 11:59 AM cb126yx <cb126yx(a)126.com&gt; wrote: >>> >>> Sorry, as the origin patch has aleardy been added to patch log, >>> >>> so the below comment in arm64.c is Inappropriate and inconsistent: >>> >>> * gki related commit url: >>> >>> * https://lore.kernel.org/all/20230412160134.306148-4-mark.rutland@arm.com/ >>> >>> so delete these url link comment in V4 version. >>> >>> >>> patch v4 here: >>> >>> ===> >>> >>> >>> From ab61e60987e4a835e41e4c19822174045888b84e Mon Sep 17 00:00:00 2001 >>> >>> From: bevis_chen <bevis_chen(a)asus.com&gt; >>> >>> Date: Wed, 3 Jul 2024 15:05:44 +0800 >>> >>> Subject: [PATCH] arm64: Fix bt command show wrong stacktrace on ramdump source >>> >>> >>> If we use crash to parse ramdump(Qcom phone device) rathen than vmcore. >>> >>> Start command should be like: crash vmlinux --kaslr=xxx DDRCS0_0.BIN@0x0000000080000000,... --machdep vabits_actual=39 >>> >>> Then We will see bt command show misleading backtrace information below: >>> >>> >>> crash> bt 16930 >>> >>> PID: 16930 TASK: ffffff89b3eada00 CPU: 2 COMMAND: "Firebase Backgr" >>> >>> #0 [ffffffc034c437f0] __switch_to at ffffffe0036832d4 >>> >>> #1 [ffffffc034c43850] __kvm_nvhe_$d.2314 at 6be732e004cf05a0 >>> >>> #2 [ffffffc034c438b0] __kvm_nvhe_$d.2314 at 86c54c6004ceff80 >>> >>> #3 [ffffffc034c43950] __kvm_nvhe_$d.2314 at 55d6f96003a7b120 >>> >>> #4 [ffffffc034c439f0] __kvm_nvhe_$d.2314 at 9ccec46003a80a64 >>> >>> #5 [ffffffc034c43ac0] __kvm_nvhe_$d.2314 at 8cf41e6003a945c4 >>> >>> #6 [ffffffc034c43b10] __kvm_nvhe_$d.2314 at a8f181e00372c818 >>> >>> #7 [ffffffc034c43b40] __kvm_nvhe_$d.2314 at 6dedde600372c0d0 >>> >>> #8 [ffffffc034c43b90] __kvm_nvhe_$d.2314 at 62cc07e00373d0ac >>> >>> #9 [ffffffc034c43c00] __kvm_nvhe_$d.2314 at 72fb1de00373bedc >>> >>> ... >>> >>> PC: 00000073f5294840 LR: 00000070d8f39ba4 SP: 00000070d4afd5d0 >>> >>> X29: 00000070d4afd600 X28: b4000071efcda7f0 X27: 00000070d4afe000 >>> >>> X26: 0000000000000000 X25: 00000070d9616000 X24: 0000000000000000 >>> >>> X23: 0000000000000000 X22: 0000000000000000 X21: 0000000000000000 >>> >>> X20: b40000728fd27520 X19: b40000728fd27550 X18: 000000702daba000 >>> >>> X17: 00000073f5294820 X16: 00000070d940f9d8 X15: 00000000000000bf >>> >>> X14: 0000000000000000 X13: 00000070d8ad2fac X12: b40000718fce5040 >>> >>> X11: 0000000000000000 X10: 0000000000000070 X9: 0000000000000001 >>> >>> X8: 0000000000000062 X7: 0000000000000020 X6: 0000000000000000 >>> >>> X5: 0000000000000000 X4: 0000000000000000 X3: 0000000000000000 >>> >>> X2: 0000000000000002 X1: 0000000000000080 X0: b40000728fd27550 >>> >>> ORIG_X0: b40000728fd27550 SYSCALLNO: ffffffff PSTATE: 40001000 >>> >>> >>> By checking the raw data below, will see the lr (fp+8) data show the pointer which already been replaced by PAC prefix. >>> >>> >>> crash> bt -f >>> >>> PID: 16930 TASK: ffffff89b3eada00 CPU: 2 COMMAND: "Firebase Backgr" >>> >>> #0 [ffffffc034c437f0] __switch_to at ffffffe0036832d4 >>> >>> ffffffc034c437f0: ffffffc034c43850 6be732e004cf05a4 >>> >>> ffffffc034c43800: ffffffe006186108 a0ed07e004cf09c4 >>> >>> ffffffc034c43810: ffffff8a1a340000 ffffff8a8d343c00 >>> >>> ffffffc034c43820: ffffff89b3eada00 ffffff8b780db540 >>> >>> ffffffc034c43830: ffffff89b3eada00 0000000000000000 >>> >>> ffffffc034c43840: 0000000000000004 712b828118484a00 >>> >>> #1 [ffffffc034c43850] __kvm_nvhe_$d.2314 at 6be732e004cf05a0 >>> >>> ffffffc034c43850: ffffffc034c438b0 86c54c6004ceff84 >>> >>> ffffffc034c43860: 000000708070f000 ffffffc034c43938 >>> >>> ffffffc034c43870: ffffff88bd822878 ffffff89b3eada00 >>> >>> ... >>> >>> >>> So we check the CONFIG_ARM64_PTR_AUTH and CONFIG_ARM64_PTR_AUTH_KERNEL to double check if pac mechanism been enabled on this ramdump. >>> >>> Then we use vabits to figure it out. >>> >>> Fix then show the right backtrace below: >>> >>> crash> bt 16930 >>> >>> PID: 16930 TASK: ffffff89b3eada00 CPU: 2 COMMAND: "Firebase Backgr" >>> >>> #0 [ffffffc034c437f0] __switch_to at ffffffe0036832d4 >>> >>> #1 [ffffffc034c43850] __schedule at ffffffe004cf05a0 >>> >>> #2 [ffffffc034c438b0] preempt_schedule_common at ffffffe004ceff80 >>> >>> #3 [ffffffc034c43950] unmap_page_range at ffffffe003a7b120 >>> >>> #4 [ffffffc034c439f0] unmap_vmas at ffffffe003a80a64 >>> >>> #5 [ffffffc034c43ac0] exit_mmap at ffffffe003a945c4 >>> >>> #6 [ffffffc034c43b10] __mmput at ffffffe00372c818 >>> >>> #7 [ffffffc034c43b40] mmput at ffffffe00372c0d0 >>> >>> #8 [ffffffc034c43b90] exit_mm at ffffffe00373d0ac >>> >>> #9 [ffffffc034c43c00] do_exit at ffffffe00373bedc >>> >>> PC: 00000073f5294840 LR: 00000070d8f39ba4 SP: 00000070d4afd5d0 >>> >>> X29: 00000070d4afd600 X28: b4000071efcda7f0 X27: 00000070d4afe000 >>> >>> X26: 0000000000000000 X25: 00000070d9616000 X24: 0000000000000000 >>> >>> X23: 0000000000000000 X22: 0000000000000000 X21: 0000000000000000 >>> >>> X20: b40000728fd27520 X19: b40000728fd27550 X18: 000000702daba000 >>> >>> X17: 00000073f5294820 X16: 00000070d940f9d8 X15: 00000000000000bf >>> >>> X14: 0000000000000000 X13: 00000070d8ad2fac X12: b40000718fce5040 >>> >>> X11: 0000000000000000 X10: 0000000000000070 X9: 0000000000000001 >>> >>> X8: 0000000000000062 X7: 0000000000000020 X6: 0000000000000000 >>> >>> X5: 0000000000000000 X4: 0000000000000000 X3: 0000000000000000 >>> >>> X2: 0000000000000002 X1: 0000000000000080 X0: b40000728fd27550 >>> >>> ORIG_X0: b40000728fd27550 SYSCALLNO: ffffffff PSTATE: 40001000 >>> >>> >>> Let's use GENMASK to replace the pac pointer to fix it. >>> >>> gki related commit as below: >>> >>> >>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>> >>> Author: Amit Daniel Kachhap <amit.kachhap(a)arm.com&gt; >>> >>> Date: Fri Mar 13 14:34:58 2020 +0530 >>> >>> >>> arm64: mask PAC bits of __builtin_return_address >>> >>> >>> Functions like vmap() record how much memory has been allocated by their >>> >>> callers, and callers are identified using __builtin_return_address(). Once >>> >>> the kernel is using pointer-auth the return address will be signed. This >>> >>> means it will not match any kernel symbol, and will vary between threads >>> >>> even for the same caller. >>> >>> >>> The output of /proc/vmallocinfo in this case may look like, >>> >>> 0x(____ptrval____)-0x(____ptrval____) 20480 0x86e28000100e7c60 pages=4 vmalloc N0=4 >>> >>> 0x(____ptrval____)-0x(____ptrval____) 20480 0x86e28000100e7c60 pages=4 vmalloc N0=4 >>> >>> 0x(____ptrval____)-0x(____ptrval____) 20480 0xc5c78000100e7c60 pages=4 vmalloc N0=4 >>> >>> >>> The above three 64bit values should be the same symbol name and not >>> >>> different LR values. >>> >>> >>> Use the pre-processor to add logic to clear the PAC to >>> >>> __builtin_return_address() callers. This patch adds a new file >>> >>> asm/compiler.h and is transitively included via include/compiler_types.h on >>> >>> the compiler command line so it is guaranteed to be loaded and the users of >>> >>> this macro will not find a wrong version. >>> >>> >>> Helper macros ptrauth_kernel_pac_mask/ptrauth_clear_pac are created for >>> >>> this purpose and added in this file. Existing macro ptrauth_user_pac_mask >>> >>> moved from asm/pointer_auth.h. >>> >>> >>> Signed-off-by: Amit Daniel Kachhap <amit.kachhap(a)arm.com&gt; >>> >>> Reviewed-by: James Morse <james.morse(a)arm.com&gt; >>> >>> Signed-off-by: Catalin Marinas <catalin.marinas(a)arm.com&gt; >>> >>> >>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig >>> >>> index 87e2cbb76930..115ceea0293e 100644 >>> >>> --- a/arch/arm64/Kconfig >>> >>> +++ b/arch/arm64/Kconfig >>> >>> @@ -118,6 +118,7 @@ config ARM64 >>> >>> select HAVE_ALIGNED_STRUCT_PAGE if SLUB >>> >>> select HAVE_ARCH_AUDITSYSCALL >>> >>> select HAVE_ARCH_BITREVERSE >>> >>> + select HAVE_ARCH_COMPILER_H >>> >>> select HAVE_ARCH_HUGE_VMAP >>> >>> select HAVE_ARCH_JUMP_LABEL >>> >>> select HAVE_ARCH_JUMP_LABEL_RELATIVE >>> >>> diff --git a/arch/arm64/include/asm/compiler.h b/arch/arm64/include/asm/compiler.h >>> >>> new file mode 100644 >>> >>> index 000000000000..eece20d2c55f >>> >>> --- /dev/null >>> >>> +++ b/arch/arm64/include/asm/compiler.h >>> >>> @@ -0,0 +1,24 @@ >>> >>> +/* SPDX-License-Identifier: GPL-2.0 */ >>> >>> +#ifndef __ASM_COMPILER_H >>> >>> +#define __ASM_COMPILER_H >>> >>> + >>> >>> +#if defined(CONFIG_ARM64_PTR_AUTH) >>> >>> + >>> >>> +/* >>> >>> + * The EL0/EL1 pointer bits used by a pointer authentication code. >>> >>> + * This is dependent on TBI0/TBI1 being enabled, or bits 63:56 would also apply. >>> >>> + */ >>> >>> +#define ptrauth_user_pac_mask() GENMASK_ULL(54, vabits_actual) >>> >>> +#define ptrauth_kernel_pac_mask() GENMASK_ULL(63, vabits_actual) >>> >>> + >>> >>> +/* Valid for EL0 TTBR0 and EL1 TTBR1 instruction pointers */ >>> >>> +#define ptrauth_clear_pac(ptr) \ >>> >>> + ((ptr & BIT_ULL(55)) ? (ptr | ptrauth_kernel_pac_mask()) : \ >>> >>> + (ptr & ~ptrauth_user_pac_mask())) >>> >>> + >>> >>> +#define __builtin_return_address(val) \ >>> >>> + (void *)(ptrauth_clear_pac((unsigned long)__builtin_return_address(val))) >>> >>> + >>> >>> +#endif /* CONFIG_ARM64_PTR_AUTH */ >>> >>> + >>> >>> +#endif /* __ASM_COMPILER_H */ >>> >>> diff --git a/arch/arm64/include/asm/pointer_auth.h b/arch/arm64/include/asm/pointer_auth.h >>> >>> index 833d3f948de0..70c47156e54b 100644 >>> >>> --- a/arch/arm64/include/asm/pointer_auth.h >>> >>> +++ b/arch/arm64/include/asm/pointer_auth.h >>> >>> @@ -68,16 +68,9 @@ static __always_inline void ptrauth_keys_switch_kernel(struct ptrauth_keys_kerne >>> >>> >>> extern int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg); >>> >>> >>> -/* >>> >>> - * The EL0 pointer bits used by a pointer authentication code. >>> >>> - * This is dependent on TBI0 being enabled, or bits 63:56 would also apply. >>> >>> - */ >>> >>> -#define ptrauth_user_pac_mask() GENMASK(54, vabits_actual) >>> >>> - >>> >>> -/* Only valid for EL0 TTBR0 instruction pointers */ >>> >>> static inline unsigned long ptrauth_strip_insn_pac(unsigned long ptr) >>> >>> { >>> >>> - return ptr & ~ptrauth_user_pac_mask(); >>> >>> + return ptrauth_clear_pac(ptr); >>> >>> } >>> >>> >>> #define ptrauth_thread_init_user(tsk) >>> >>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>> >>> >>> Signed-off-by: bevis_chen <bevis_chen(a)asus.com&gt; >>> >>> --- >>> >>> arm64.c | 31 +++++++++++++++++++++++++++++++ >>> >>> 1 file changed, 31 insertions(+) >>> >>> >>> diff --git a/arm64.c b/arm64.c >>> >>> index b3040d7..c83a91a 100644 >>> >>> --- a/arm64.c >>> >>> +++ b/arm64.c >>> >>> @@ -92,6 +92,7 @@ static void arm64_get_crash_notes(void); >>> >>> static void arm64_calc_VA_BITS(void); >>> >>> static int arm64_is_uvaddr(ulong, struct task_context *); >>> >>> static void arm64_calc_KERNELPACMASK(void); >>> >>> +static void arm64_recalc_KERNELPACMASK(void); >>> >>> static int arm64_get_vmcoreinfo(unsigned long *vaddr, const char *label, int base); >>> >>> >>> struct kernel_range { >>> >>> @@ -581,6 +582,16 @@ arm64_init(int when) >>> >>> if (!machdep->hz) >>> >>> machdep->hz = 100; >>> >>> >>> + /* >>> >>> + * In the case of using ramdump rather than vmcore, >>> >>> + * Will fail to parse out KERNELPAC. >>> >>> + * So let's try again from kconfig to ensure if PAC enabled. >>> >>> + * If yes, then we use vabits to figure it out. >>> >>> + */ >>> >>> + if(!machdep->machspec->CONFIG_ARM64_KERNELPACMASK) >>> >>> + arm64_recalc_KERNELPACMASK(); >>> >>> + >>> >>> + >>> >>> arm64_irq_stack_init(); >>> >>> arm64_overflow_stack_init(); >>> >>> arm64_stackframe_init(); >>> >>> @@ -4921,6 +4932,26 @@ static void arm64_calc_KERNELPACMASK(void) >>> >>> } >>> >>> } >>> >>> >>> + >>> >>> +#define GENMASK_UL(h, l) \ >>> >>> + (((~0UL) << (l)) & (~0UL >> (BITS_PER_LONG - 1 - (h)))) >>> >>> + >> >> >> >> Think it again, the IKCONFIG is not available in most distributions, so it may not work well in such cases. >> >> Can we use some symbols to determine if the PTR AUTH mechanism is enabled? For example([1] or [2]): >> #ifdef CONFIG_ARM64_PTR_AUTH_KERNEL >> >> struct ptrauth_keys_kernel { >> struct ptrauth_key apia; >> }; >> >> [1] check if the struct ptrauth_keys_kernel exists, eg: >> >> STRUCT_SIZE_INIT(ptrauth_keys_kernel, "ptrauth_keys_kernel"); >> >> if (VALID_SIZE(ptrauth_keys_kernel) > 0) { > >I think > >if (VALID_SIZE(ptrauth_keys_kernel)) > >is enough... > >> >> if (machdep->machspec->VA_BITS_ACTUAL){ >> >> machdep->machspec->CONFIG_ARM64_KERNELPACMASK = >> >> GENMASK_UL(63, machdep->machspec->VA_BITS_ACTUAL); >> >> } > >I'm OK with this check, it looks reasonable and worth a try... Hi >@cb126yx, could you please have a try on this modification, to see if >it can work for you? > >> >> ------------------------------------------------------------------------------------------------------------------ >> static __always_inline void ptrauth_keys_init_kernel(struct ptrauth_keys_kernel *keys) >> { >> if (system_supports_address_auth()) >> get_random_bytes(&keys->apia, sizeof(keys->apia)); >> } >> ... >> >> [2] check if the kernel symbol exists, eg: >> if (kernel_symbol_exists("ptrauth_keys_init_kernel")) { > >I guess this check will not work, since the ptrauth_keys_init_kernel >is inlined, there might be no such symbol found in kernel. Please >correct me if I'm wrong... > >Thanks, >Tao Liu > >> if (machdep->machspec->VA_BITS_ACTUAL){ >> >> machdep->machspec->CONFIG_ARM64_KERNELPACMASK = >> >> GENMASK_UL(63, machdep->machspec->VA_BITS_ACTUAL); >> >> } >> >> What do you think? bevis_chen and Tao. Or any thoughts? >> >> BTW: In addition, the CONFIG_ARM64_PTR_AUTH_KERNEL relies on the CONFIG_ARM64_PTR_AUTH, no need to check them simultaneously. >> >> Thanks >> Lianbo >> >>> +static void arm64_recalc_KERNELPACMASK(void){ >>> >>> + if (kt->ikconfig_flags & IKCONFIG_AVAIL){ >>> >>> + /* arm64: check pac already enabled yet.*/ >>> >>> + if ((get_kernel_config("CONFIG_ARM64_PTR_AUTH", NULL) == IKCONFIG_Y) >>> >>> + && (get_kernel_config("CONFIG_ARM64_PTR_AUTH_KERNEL", NULL) == IKCONFIG_Y)){ >>> >>> + if (machdep->machspec->VA_BITS_ACTUAL){ >>> >>> + machdep->machspec->CONFIG_ARM64_KERNELPACMASK = >>> >>> + GENMASK_UL(63, machdep->machspec->VA_BITS_ACTUAL); >>> >>> + if (CRASHDEBUG(1)) >>> >>> + fprintf(fp, "CONFIG_ARM64_KERNELPACMASK: %lx\n", >>> >>> + machdep->machspec->CONFIG_ARM64_KERNELPACMASK); >>> >>> + } >>> >>> + } >>> >>> + } >>> >>> +} >>> >>> + >>> >>> #endif /* ARM64 */ >>> >>> >>> >>> -- >>> >>> 2.27.0 >>> >>> >>> >>> >>> >>> >>> >>> At 2024-07-15 11:33:13, "cb126yx" <cb126yx(a)126.com&gt; wrote: >>> >>> >>> Hi Lianbo >>> >>> >>> I have already added the origin commit information to patch log, as V3 below. >>> >>> >>> About the macro __GENMASK and GENMASK_UL. >>> >>> Both the two macros achieve the same effect, but __GENMASK uses more addition and subtraction operations and is usually called in an internal kernel core bit operation function,. >>> >>> Whereas GENMASK_UL uses shift operations directly, which are more efficient and been exposed to external users as api, so I indeed use the GENMASK_UL on purpose. >>> >>> >>> If you have any other suggestions, please feel free to tell me ! >>> >>> >>> >>> From 1da252fcba90af00a42328f2a5e2ec5058ff4f7e Mon Sep 17 00:00:00 2001 >>> >>> From: bevis_chen <bevis_chen(a)asus.com&gt; >>> >>> Date: Wed, 3 Jul 2024 15:05:44 +0800 >>> >>> Subject: [PATCH] arm64: Fix bt command show wrong stacktrace on ramdump source >>> >>> >>> If we use crash to parse ramdump(Qcom phone device) rathen than vmcore. >>> >>> Start command should be like: crash vmlinux --kaslr=xxx DDRCS0_0.BIN@0x0000000080000000,... --machdep vabits_actual=39 >>> >>> Then We will see bt command show misleading backtrace information below: >>> >>> >>> crash> bt 16930 >>> >>> PID: 16930 TASK: ffffff89b3eada00 CPU: 2 COMMAND: "Firebase Backgr" >>> >>> #0 [ffffffc034c437f0] __switch_to at ffffffe0036832d4 >>> >>> #1 [ffffffc034c43850] __kvm_nvhe_$d.2314 at 6be732e004cf05a0 >>> >>> #2 [ffffffc034c438b0] __kvm_nvhe_$d.2314 at 86c54c6004ceff80 >>> >>> #3 [ffffffc034c43950] __kvm_nvhe_$d.2314 at 55d6f96003a7b120 >>> >>> #4 [ffffffc034c439f0] __kvm_nvhe_$d.2314 at 9ccec46003a80a64 >>> >>> #5 [ffffffc034c43ac0] __kvm_nvhe_$d.2314 at 8cf41e6003a945c4 >>> >>> #6 [ffffffc034c43b10] __kvm_nvhe_$d.2314 at a8f181e00372c818 >>> >>> #7 [ffffffc034c43b40] __kvm_nvhe_$d.2314 at 6dedde600372c0d0 >>> >>> #8 [ffffffc034c43b90] __kvm_nvhe_$d.2314 at 62cc07e00373d0ac >>> >>> #9 [ffffffc034c43c00] __kvm_nvhe_$d.2314 at 72fb1de00373bedc >>> >>> ... >>> >>> PC: 00000073f5294840 LR: 00000070d8f39ba4 SP: 00000070d4afd5d0 >>> >>> X29: 00000070d4afd600 X28: b4000071efcda7f0 X27: 00000070d4afe000 >>> >>> X26: 0000000000000000 X25: 00000070d9616000 X24: 0000000000000000 >>> >>> X23: 0000000000000000 X22: 0000000000000000 X21: 0000000000000000 >>> >>> X20: b40000728fd27520 X19: b40000728fd27550 X18: 000000702daba000 >>> >>> X17: 00000073f5294820 X16: 00000070d940f9d8 X15: 00000000000000bf >>> >>> X14: 0000000000000000 X13: 00000070d8ad2fac X12: b40000718fce5040 >>> >>> X11: 0000000000000000 X10: 0000000000000070 X9: 0000000000000001 >>> >>> X8: 0000000000000062 X7: 0000000000000020 X6: 0000000000000000 >>> >>> X5: 0000000000000000 X4: 0000000000000000 X3: 0000000000000000 >>> >>> X2: 0000000000000002 X1: 0000000000000080 X0: b40000728fd27550 >>> >>> ORIG_X0: b40000728fd27550 SYSCALLNO: ffffffff PSTATE: 40001000 >>> >>> >>> By checking the raw data below, will see the lr (fp+8) data show the pointer which already been replaced by PAC prefix. >>> >>> >>> crash> bt -f >>> >>> PID: 16930 TASK: ffffff89b3eada00 CPU: 2 COMMAND: "Firebase Backgr" >>> >>> #0 [ffffffc034c437f0] __switch_to at ffffffe0036832d4 >>> >>> ffffffc034c437f0: ffffffc034c43850 6be732e004cf05a4 >>> >>> ffffffc034c43800: ffffffe006186108 a0ed07e004cf09c4 >>> >>> ffffffc034c43810: ffffff8a1a340000 ffffff8a8d343c00 >>> >>> ffffffc034c43820: ffffff89b3eada00 ffffff8b780db540 >>> >>> ffffffc034c43830: ffffff89b3eada00 0000000000000000 >>> >>> ffffffc034c43840: 0000000000000004 712b828118484a00 >>> >>> #1 [ffffffc034c43850] __kvm_nvhe_$d.2314 at 6be732e004cf05a0 >>> >>> ffffffc034c43850: ffffffc034c438b0 86c54c6004ceff84 >>> >>> ffffffc034c43860: 000000708070f000 ffffffc034c43938 >>> >>> ffffffc034c43870: ffffff88bd822878 ffffff89b3eada00 >>> >>> ... >>> >>> >>> So we check the CONFIG_ARM64_PTR_AUTH and CONFIG_ARM64_PTR_AUTH_KERNEL to double check if pac mechanism been enabled on this ramdump. >>> >>> Then we use vabits to figure it out. >>> >>> Fix then show the right backtrace below: >>> >>> crash> bt 16930 >>> >>> PID: 16930 TASK: ffffff89b3eada00 CPU: 2 COMMAND: "Firebase Backgr" >>> >>> #0 [ffffffc034c437f0] __switch_to at ffffffe0036832d4 >>> >>> #1 [ffffffc034c43850] __schedule at ffffffe004cf05a0 >>> >>> #2 [ffffffc034c438b0] preempt_schedule_common at ffffffe004ceff80 >>> >>> #3 [ffffffc034c43950] unmap_page_range at ffffffe003a7b120 >>> >>> #4 [ffffffc034c439f0] unmap_vmas at ffffffe003a80a64 >>> >>> #5 [ffffffc034c43ac0] exit_mmap at ffffffe003a945c4 >>> >>> #6 [ffffffc034c43b10] __mmput at ffffffe00372c818 >>> >>> #7 [ffffffc034c43b40] mmput at ffffffe00372c0d0 >>> >>> #8 [ffffffc034c43b90] exit_mm at ffffffe00373d0ac >>> >>> #9 [ffffffc034c43c00] do_exit at ffffffe00373bedc >>> >>> PC: 00000073f5294840 LR: 00000070d8f39ba4 SP: 00000070d4afd5d0 >>> >>> X29: 00000070d4afd600 X28: b4000071efcda7f0 X27: 00000070d4afe000 >>> >>> X26: 0000000000000000 X25: 00000070d9616000 X24: 0000000000000000 >>> >>> X23: 0000000000000000 X22: 0000000000000000 X21: 0000000000000000 >>> >>> X20: b40000728fd27520 X19: b40000728fd27550 X18: 000000702daba000 >>> >>> X17: 00000073f5294820 X16: 00000070d940f9d8 X15: 00000000000000bf >>> >>> X14: 0000000000000000 X13: 00000070d8ad2fac X12: b40000718fce5040 >>> >>> X11: 0000000000000000 X10: 0000000000000070 X9: 0000000000000001 >>> >>> X8: 0000000000000062 X7: 0000000000000020 X6: 0000000000000000 >>> >>> X5: 0000000000000000 X4: 0000000000000000 X3: 0000000000000000 >>> >>> X2: 0000000000000002 X1: 0000000000000080 X0: b40000728fd27550 >>> >>> ORIG_X0: b40000728fd27550 SYSCALLNO: ffffffff PSTATE: 40001000 >>> >>> >>> Let's use GENMASK to replace the pac pointer to fix it. >>> >>> gki related commit as below: >>> >>> >>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>> >>> Author: Amit Daniel Kachhap <amit.kachhap(a)arm.com&gt; >>> >>> Date: Fri Mar 13 14:34:58 2020 +0530 >>> >>> >>> arm64: mask PAC bits of __builtin_return_address >>> >>> >>> Functions like vmap() record how much memory has been allocated by their >>> >>> callers, and callers are identified using __builtin_return_address(). Once >>> >>> the kernel is using pointer-auth the return address will be signed. This >>> >>> means it will not match any kernel symbol, and will vary between threads >>> >>> even for the same caller. >>> >>> >>> The output of /proc/vmallocinfo in this case may look like, >>> >>> 0x(____ptrval____)-0x(____ptrval____) 20480 0x86e28000100e7c60 pages=4 vmalloc N0=4 >>> >>> 0x(____ptrval____)-0x(____ptrval____) 20480 0x86e28000100e7c60 pages=4 vmalloc N0=4 >>> >>> 0x(____ptrval____)-0x(____ptrval____) 20480 0xc5c78000100e7c60 pages=4 vmalloc N0=4 >>> >>> >>> The above three 64bit values should be the same symbol name and not >>> >>> different LR values. >>> >>> >>> Use the pre-processor to add logic to clear the PAC to >>> >>> __builtin_return_address() callers. This patch adds a new file >>> >>> asm/compiler.h and is transitively included via include/compiler_types.h on >>> >>> the compiler command line so it is guaranteed to be loaded and the users of >>> >>> this macro will not find a wrong version. >>> >>> >>> Helper macros ptrauth_kernel_pac_mask/ptrauth_clear_pac are created for >>> >>> this purpose and added in this file. Existing macro ptrauth_user_pac_mask >>> >>> moved from asm/pointer_auth.h. >>> >>> >>> Signed-off-by: Amit Daniel Kachhap <amit.kachhap(a)arm.com&gt; >>> >>> Reviewed-by: James Morse <james.morse(a)arm.com&gt; >>> >>> Signed-off-by: Catalin Marinas <catalin.marinas(a)arm.com&gt; >>> >>> >>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig >>> >>> index 87e2cbb76930..115ceea0293e 100644 >>> >>> --- a/arch/arm64/Kconfig >>> >>> +++ b/arch/arm64/Kconfig >>> >>> @@ -118,6 +118,7 @@ config ARM64 >>> >>> select HAVE_ALIGNED_STRUCT_PAGE if SLUB >>> >>> select HAVE_ARCH_AUDITSYSCALL >>> >>> select HAVE_ARCH_BITREVERSE >>> >>> + select HAVE_ARCH_COMPILER_H >>> >>> select HAVE_ARCH_HUGE_VMAP >>> >>> select HAVE_ARCH_JUMP_LABEL >>> >>> select HAVE_ARCH_JUMP_LABEL_RELATIVE >>> >>> diff --git a/arch/arm64/include/asm/compiler.h b/arch/arm64/include/asm/compiler.h >>> >>> new file mode 100644 >>> >>> index 000000000000..eece20d2c55f >>> >>> --- /dev/null >>> >>> +++ b/arch/arm64/include/asm/compiler.h >>> >>> @@ -0,0 +1,24 @@ >>> >>> +/* SPDX-License-Identifier: GPL-2.0 */ >>> >>> +#ifndef __ASM_COMPILER_H >>> >>> +#define __ASM_COMPILER_H >>> >>> + >>> >>> +#if defined(CONFIG_ARM64_PTR_AUTH) >>> >>> + >>> >>> +/* >>> >>> + * The EL0/EL1 pointer bits used by a pointer authentication code. >>> >>> + * This is dependent on TBI0/TBI1 being enabled, or bits 63:56 would also apply. >>> >>> + */ >>> >>> +#define ptrauth_user_pac_mask() GENMASK_ULL(54, vabits_actual) >>> >>> +#define ptrauth_kernel_pac_mask() GENMASK_ULL(63, vabits_actual) >>> >>> + >>> >>> +/* Valid for EL0 TTBR0 and EL1 TTBR1 instruction pointers */ >>> >>> +#define ptrauth_clear_pac(ptr) \ >>> >>> + ((ptr & BIT_ULL(55)) ? (ptr | ptrauth_kernel_pac_mask()) : \ >>> >>> + (ptr & ~ptrauth_user_pac_mask())) >>> >>> + >>> >>> +#define __builtin_return_address(val) \ >>> >>> + (void *)(ptrauth_clear_pac((unsigned long)__builtin_return_address(val))) >>> >>> + >>> >>> +#endif /* CONFIG_ARM64_PTR_AUTH */ >>> >>> + >>> >>> +#endif /* __ASM_COMPILER_H */ >>> >>> diff --git a/arch/arm64/include/asm/pointer_auth.h b/arch/arm64/include/asm/pointer_auth.h >>> >>> index 833d3f948de0..70c47156e54b 100644 >>> >>> --- a/arch/arm64/include/asm/pointer_auth.h >>> >>> +++ b/arch/arm64/include/asm/pointer_auth.h >>> >>> @@ -68,16 +68,9 @@ static __always_inline void ptrauth_keys_switch_kernel(struct ptrauth_keys_kerne >>> >>> >>> extern int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg); >>> >>> >>> -/* >>> >>> - * The EL0 pointer bits used by a pointer authentication code. >>> >>> - * This is dependent on TBI0 being enabled, or bits 63:56 would also apply. >>> >>> - */ >>> >>> -#define ptrauth_user_pac_mask() GENMASK(54, vabits_actual) >>> >>> - >>> >>> -/* Only valid for EL0 TTBR0 instruction pointers */ >>> >>> static inline unsigned long ptrauth_strip_insn_pac(unsigned long ptr) >>> >>> { >>> >>> - return ptr & ~ptrauth_user_pac_mask(); >>> >>> + return ptrauth_clear_pac(ptr); >>> >>> } >>> >>> >>> #define ptrauth_thread_init_user(tsk) >>> >>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>> >>> >>> Signed-off-by: bevis_chen <bevis_chen(a)asus.com&gt; >>> >>> --- >>> >>> arm64.c | 33 +++++++++++++++++++++++++++++++++ >>> >>> 1 file changed, 33 insertions(+) >>> >>> >>> diff --git a/arm64.c b/arm64.c >>> >>> index b3040d7..d8ce98f 100644 >>> >>> --- a/arm64.c >>> >>> +++ b/arm64.c >>> >>> @@ -92,6 +92,7 @@ static void arm64_get_crash_notes(void); >>> >>> static void arm64_calc_VA_BITS(void); >>> >>> static int arm64_is_uvaddr(ulong, struct task_context *); >>> >>> static void arm64_calc_KERNELPACMASK(void); >>> >>> +static void arm64_recalc_KERNELPACMASK(void); >>> >>> static int arm64_get_vmcoreinfo(unsigned long *vaddr, const char *label, int base); >>> >>> >>> struct kernel_range { >>> >>> @@ -581,6 +582,18 @@ arm64_init(int when) >>> >>> if (!machdep->hz) >>> >>> machdep->hz = 100; >>> >>> >>> + /* >>> >>> + * In the case of using ramdump rather than vmcore, >>> >>> + * Will fail to parse out KERNELPAC. >>> >>> + * So let's try again from kconfig to ensure if PAC enabled. >>> >>> + * If yes, then we use vabits to figure it out. >>> >>> + * gki related commit url: >>> >>> + * https://lore.kernel.org/all/20230412160134.306148-4-mark.rutland@arm.com/ >>> >>> + */ >>> >>> + if(!machdep->machspec->CONFIG_ARM64_KERNELPACMASK) >>> >>> + arm64_recalc_KERNELPACMASK(); >>> >>> + >>> >>> + >>> >>> arm64_irq_stack_init(); >>> >>> arm64_overflow_stack_init(); >>> >>> arm64_stackframe_init(); >>> >>> @@ -4921,6 +4934,26 @@ static void arm64_calc_KERNELPACMASK(void) >>> >>> } >>> >>> } >>> >>> >>> + >>> >>> +#define GENMASK_UL(h, l) \ >>> >>> + (((~0UL) << (l)) & (~0UL >> (BITS_PER_LONG - 1 - (h)))) >>> >>> + >>> >>> +static void arm64_recalc_KERNELPACMASK(void){ >>> >>> + if (kt->ikconfig_flags & IKCONFIG_AVAIL){ >>> >>> + /* arm64: check pac already enabled yet.*/ >>> >>> + if ((get_kernel_config("CONFIG_ARM64_PTR_AUTH", NULL) == IKCONFIG_Y) >>> >>> + && (get_kernel_config("CONFIG_ARM64_PTR_AUTH_KERNEL", NULL) == IKCONFIG_Y)){ >>> >>> + if (machdep->machspec->VA_BITS_ACTUAL){ >>> >>> + machdep->machspec->CONFIG_ARM64_KERNELPACMASK = >>> >>> + GENMASK_UL(63, machdep->machspec->VA_BITS_ACTUAL); >>> >>> + if (CRASHDEBUG(1)) >>> >>> + fprintf(fp, "CONFIG_ARM64_KERNELPACMASK: %lx\n", >>> >>> + machdep->machspec->CONFIG_ARM64_KERNELPACMASK); >>> >>> + } >>> >>> + } >>> >>> + } >>> >>> +} >>> >>> + >>> >>> #endif /* ARM64 */ >>> >>> >>> >>> -- >>> >>> 2.27.0 >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> At 2024-07-12 16:08:54, "Lianbo Jiang" <lijiang(a)redhat.com&gt; wrote: >>> >Hi, bevis_chen >>> > >>> >Thank you for the v2. >>> > >>> >On 7/11/24 6:42 AM, devel-request(a)lists.crash-utility.osci.io wrote: >>> >> Date: Wed, 10 Jul 2024 14:19:01 -0000 >>> >> From:cb126yx@126.com >>> >> Subject: [Crash-utility] Re: arm64: Fix bt command show wrong >>> >> stacktrace on ramdump source >>> >> To:devel@lists.crash-utility.osci.io >>> >> Message-ID:<20240710141901.30295.7874@lists.crash-utility.osci.io> >>> >> Content-Type: text/plain; charset="utf-8" >>> >> >>> >> >From dd6b187ac15a237cefe863c4e5b432cf13b9883a Mon Sep 17 00:00:00 2001 >>> >> From: bevis_chen&lt;bevis_chen(a)asus.com&gt; >>> >> Date: Wed, 3 Jul 2024 15:05:44 +0800 >>> >> Subject: [PATCH] arm64: Fix bt command show wrong stacktrace on ramdump >>> >> source >>> >> >>> >> If we use crash to parse ramdump(Qcom phone device) rathen than vmcore. >>> >> Start command should be like: crash vmlinux --kaslr=xxx >>> >> DDRCS0_0.BIN@0x0000000080000000,... --machdep vabits_actual=39 >>> >> Then We will see bt command show misleading backtrace information below: >>> >> >>> >> crash> bt 16930 >>> >> PID: 16930 TASK: ffffff89b3eada00 CPU: 2 COMMAND: "Firebase >>> >> Backgr" >>> >> #0 [ffffffc034c437f0] __switch_to at ffffffe0036832d4 >>> >> #1 [ffffffc034c43850] __kvm_nvhe_$d.2314 at 6be732e004cf05a0 >>> >> #2 [ffffffc034c438b0] __kvm_nvhe_$d.2314 at 86c54c6004ceff80 >>> >> #3 [ffffffc034c43950] __kvm_nvhe_$d.2314 at 55d6f96003a7b120 >>> >> #4 [ffffffc034c439f0] __kvm_nvhe_$d.2314 at 9ccec46003a80a64 >>> >> #5 [ffffffc034c43ac0] __kvm_nvhe_$d.2314 at 8cf41e6003a945c4 >>> >> #6 [ffffffc034c43b10] __kvm_nvhe_$d.2314 at a8f181e00372c818 >>> >> #7 [ffffffc034c43b40] __kvm_nvhe_$d.2314 at 6dedde600372c0d0 >>> >> #8 [ffffffc034c43b90] __kvm_nvhe_$d.2314 at 62cc07e00373d0ac >>> >> #9 [ffffffc034c43c00] __kvm_nvhe_$d.2314 at 72fb1de00373bedc >>> >> ... >>> >> PC: 00000073f5294840 LR: 00000070d8f39ba4 SP: 00000070d4afd5d0 >>> >> X29: 00000070d4afd600 X28: b4000071efcda7f0 X27: 00000070d4afe000 >>> >> X26: 0000000000000000 X25: 00000070d9616000 X24: 0000000000000000 >>> >> X23: 0000000000000000 X22: 0000000000000000 X21: 0000000000000000 >>> >> X20: b40000728fd27520 X19: b40000728fd27550 X18: 000000702daba000 >>> >> X17: 00000073f5294820 X16: 00000070d940f9d8 X15: 00000000000000bf >>> >> X14: 0000000000000000 X13: 00000070d8ad2fac X12: b40000718fce5040 >>> >> X11: 0000000000000000 X10: 0000000000000070 X9: 0000000000000001 >>> >> X8: 0000000000000062 X7: 0000000000000020 X6: 0000000000000000 >>> >> X5: 0000000000000000 X4: 0000000000000000 X3: 0000000000000000 >>> >> X2: 0000000000000002 X1: 0000000000000080 X0: b40000728fd27550 >>> >> ORIG_X0: b40000728fd27550 SYSCALLNO: ffffffff PSTATE: 40001000 >>> >> >>> >> By checking the raw data below, will see the lr (fp+8) data show the >>> >> pointer which already been replaced by PAC prefix. >>> >> >>> >> crash> bt -f >>> >> PID: 16930 TASK: ffffff89b3eada00 CPU: 2 COMMAND: "Firebase >>> >> Backgr" >>> >> #0 [ffffffc034c437f0] __switch_to at ffffffe0036832d4 >>> >> ffffffc034c437f0: ffffffc034c43850 6be732e004cf05a4 >>> >> ffffffc034c43800: ffffffe006186108 a0ed07e004cf09c4 >>> >> ffffffc034c43810: ffffff8a1a340000 ffffff8a8d343c00 >>> >> ffffffc034c43820: ffffff89b3eada00 ffffff8b780db540 >>> >> ffffffc034c43830: ffffff89b3eada00 0000000000000000 >>> >> ffffffc034c43840: 0000000000000004 712b828118484a00 >>> >> #1 [ffffffc034c43850] __kvm_nvhe_$d.2314 at 6be732e004cf05a0 >>> >> ffffffc034c43850: ffffffc034c438b0 86c54c6004ceff84 >>> >> ffffffc034c43860: 000000708070f000 ffffffc034c43938 >>> >> ffffffc034c43870: ffffff88bd822878 ffffff89b3eada00 >>> >> ... >>> >> >>> >> So we check the CONFIG_ARM64_PTR_AUTH and CONFIG_ARM64_PTR_AUTH_KERNEL >>> >> to double check if pac mechanism been enabled on this ramdump. >>> >> Then we use vabits to figure it out. >>> >> Fix then show the right backtrace below: >>> >> crash> bt 16930 >>> >> PID: 16930 TASK: ffffff89b3eada00 CPU: 2 COMMAND: "Firebase >>> >> Backgr" >>> >> #0 [ffffffc034c437f0] __switch_to at ffffffe0036832d4 >>> >> #1 [ffffffc034c43850] __schedule at ffffffe004cf05a0 >>> >> #2 [ffffffc034c438b0] preempt_schedule_common at ffffffe004ceff80 >>> >> #3 [ffffffc034c43950] unmap_page_range at ffffffe003a7b120 >>> >> #4 [ffffffc034c439f0] unmap_vmas at ffffffe003a80a64 >>> >> #5 [ffffffc034c43ac0] exit_mmap at ffffffe003a945c4 >>> >> #6 [ffffffc034c43b10] __mmput at ffffffe00372c818 >>> >> #7 [ffffffc034c43b40] mmput at ffffffe00372c0d0 >>> >> #8 [ffffffc034c43b90] exit_mm at ffffffe00373d0ac >>> >> #9 [ffffffc034c43c00] do_exit at ffffffe00373bedc >>> >> PC: 00000073f5294840 LR: 00000070d8f39ba4 SP: 00000070d4afd5d0 >>> >> X29: 00000070d4afd600 X28: b4000071efcda7f0 X27: 00000070d4afe000 >>> >> X26: 0000000000000000 X25: 00000070d9616000 X24: 0000000000000000 >>> >> X23: 0000000000000000 X22: 0000000000000000 X21: 0000000000000000 >>> >> X20: b40000728fd27520 X19: b40000728fd27550 X18: 000000702daba000 >>> >> X17: 00000073f5294820 X16: 00000070d940f9d8 X15: 00000000000000bf >>> >> X14: 0000000000000000 X13: 00000070d8ad2fac X12: b40000718fce5040 >>> >> X11: 0000000000000000 X10: 0000000000000070 X9: 0000000000000001 >>> >> X8: 0000000000000062 X7: 0000000000000020 X6: 0000000000000000 >>> >> X5: 0000000000000000 X4: 0000000000000000 X3: 0000000000000000 >>> >> X2: 0000000000000002 X1: 0000000000000080 X0: b40000728fd27550 >>> >> ORIG_X0: b40000728fd27550 SYSCALLNO: ffffffff PSTATE: 40001000 >>> >> >>> >> Let's use GENMASK to replace the pac pointer to fix it. >>> >> gki related commit url here: >>> >> https://lore.kernel.org/all/20230412160134.306148-4-mark.rutland@arm.com/ >>> > >>> >Can you help to add the kernel commit to patch log? >>> > >>> >de1702f65feb ("arm64: move PAC masks to <asm/pointer_auth.h>") >>> > >>> > >>> >> Signed-off-by: bevis_chen&lt;bevis_chen(a)asus.com&gt; >>> >> --- >>> >> arm64.c | 33 +++++++++++++++++++++++++++++++++ >>> >> 1 file changed, 33 insertions(+) >>> >> >>> >> diff --git a/arm64.c b/arm64.c >>> >> index b3040d7..d8ce98f 100644 >>> >> --- a/arm64.c >>> >> +++ b/arm64.c >>> >> @@ -92,6 +92,7 @@ static void arm64_get_crash_notes(void); >>> >> static void arm64_calc_VA_BITS(void); >>> >> static int arm64_is_uvaddr(ulong, struct task_context *); >>> >> static void arm64_calc_KERNELPACMASK(void); >>> >> +static void arm64_recalc_KERNELPACMASK(void); >>> >> static int arm64_get_vmcoreinfo(unsigned long *vaddr, const char *label, int base); >>> >> >>> >> struct kernel_range { >>> >> @@ -581,6 +582,18 @@ arm64_init(int when) >>> >> if (!machdep->hz) >>> >> machdep->hz = 100; >>> >> >>> >> + /* >>> >> + * In the case of using ramdump rather than vmcore, >>> >> + * Will fail to parse out KERNELPAC. >>> >> + * So let's try again from kconfig to ensure if PAC enabled. >>> >> + * If yes, then we use vabits to figure it out. >>> >> + * gki related commit url: >>> >> + *https://lore.kernel.org/all/20230412160134.306148-4-mark.rutland@arm.com/ >>> >> + */ >>> >> + if(!machdep->machspec->CONFIG_ARM64_KERNELPACMASK) >>> >> + arm64_recalc_KERNELPACMASK(); >>> >> + >>> >> + >>> >> arm64_irq_stack_init(); >>> >> arm64_overflow_stack_init(); >>> >> arm64_stackframe_init(); >>> >> @@ -4921,6 +4934,26 @@ static void arm64_calc_KERNELPACMASK(void) >>> >> } >>> >> } >>> >> >>> >> + >>> >> +#define GENMASK_UL(h, l) \ >>> >> + (((~0UL) << (l)) & (~0UL >> (BITS_PER_LONG - 1 - (h)))) >>> >> + >>> > >>> >BTW: I saw a similar version implemented in the kernel, can you help >>> >double check if that is intentional? >>> > >>> >#define __GENMASK(h, l) \ >>> > (((~_UL(0)) - (_UL(1) << (l)) + 1) & \ >>> > (~_UL(0) >> (__BITS_PER_LONG - 1 - (h)))) >>> > >>> > >>> >Thanks >>> > >>> >Lianbo >>> > >>> >> +static void arm64_recalc_KERNELPACMASK(void){ >>> >> + if (kt->ikconfig_flags & IKCONFIG_AVAIL){ >>> >> + /* arm64: check pac already enabled yet.*/ >>> >> + if ((get_kernel_config("CONFIG_ARM64_PTR_AUTH", NULL) == IKCONFIG_Y) >>> >> + && (get_kernel_config("CONFIG_ARM64_PTR_AUTH_KERNEL", NULL) == IKCONFIG_Y)){ >>> >> + if (machdep->machspec->VA_BITS_ACTUAL){ >>> >> + machdep->machspec->CONFIG_ARM64_KERNELPACMASK = >>> >> + GENMASK_UL(63, machdep->machspec->VA_BITS_ACTUAL); >>> >> + if (CRASHDEBUG(1)) >>> >> + fprintf(fp, "CONFIG_ARM64_KERNELPACMASK: %lx\n", >>> >> + machdep->machspec->CONFIG_ARM64_KERNELPACMASK); >>> >> + } >>> >> + } >>> >> + } >>> >> +} >>> >> + >>> >> #endif /* ARM64 */ >>> >> >>> >> >>> >> -- >>> >> 2.27.0 >>> >-- >>> >Crash-utility mailing list -- devel(a)lists.crash-utility.osci.io >>> >To unsubscribe send an email to devel-leave(a)lists.crash-utility.osci.io >>> >https://${domain_name}/admin/lists/devel.lists.crash-utility.osci.io/ >>> >Contribution Guidelines: https://github.com/crash-utility/crash/wiki