[PATCH v3 7/9] powerpc/64/interrupt: add missing kprobe annotations on interrupt exit symbols
From: Nicholas Piggin <npiggin@gmail.com>
Date: 2021-06-30 07:49:51
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
If one interrupt exit symbol must not be kprobed, none of them can be, without more justification for why it's safe. Disallow kprobing on any of the (non-local) labels in the exit paths. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> --- arch/powerpc/kernel/interrupt_64.S | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S
index 2c92bbca02ca..5c18362693fe 100644
--- a/arch/powerpc/kernel/interrupt_64.S
+++ b/arch/powerpc/kernel/interrupt_64.S@@ -197,6 +197,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) .Lsyscall_vectored_\name\()_rst_end: syscall_vectored_\name\()_restart: +_ASM_NOKPROBE_SYMBOL(syscall_vectored_\name\()_restart) GET_PACA(r13) ld r1,PACA_EXIT_SAVE_R1(r13) ld r2,PACATOC(r13)
@@ -238,6 +239,7 @@ _ASM_NOKPROBE_SYMBOL(system_call_vectored_emulate) .balign IFETCH_ALIGN_BYTES .globl system_call_common_real system_call_common_real: +_ASM_NOKPROBE_SYMBOL(system_call_common_real) ld r10,PACAKMSR(r13) /* get MSR value for kernel */ mtmsrd r10
@@ -402,6 +404,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) #ifdef CONFIG_PPC_BOOK3S syscall_restart: +_ASM_NOKPROBE_SYMBOL(syscall_restart) GET_PACA(r13) ld r1,PACA_EXIT_SAVE_R1(r13) ld r2,PACATOC(r13)
@@ -420,6 +423,7 @@ RESTART_TABLE(.Lsyscall_rst_start, .Lsyscall_rst_end, syscall_restart) #ifdef CONFIG_PPC_TRANSACTIONAL_MEM tabort_syscall: +_ASM_NOKPROBE_SYMBOL(tabort_syscall) /* Firstly we need to enable TM in the kernel */ mfmsr r10 li r9, 1
@@ -602,6 +606,7 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) #ifdef CONFIG_PPC_BOOK3S interrupt_return_\srr\()_user_restart: +_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_user_restart) GET_PACA(r13) ld r1,PACA_EXIT_SAVE_R1(r13) ld r2,PACATOC(r13)
@@ -735,6 +740,7 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) #ifdef CONFIG_PPC_BOOK3S interrupt_return_\srr\()_kernel_restart: +_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_kernel_restart) GET_PACA(r13) ld r1,PACA_EXIT_SAVE_R1(r13) ld r2,PACATOC(r13)
--
2.23.0