[PATCH 04/12] powerpc/powermac: Blacklist functions running with MMU disabled for kprobe
From: Christophe Leroy <hidden>
Date: 2020-03-29 09:41:10
Also in:
lkml
Subsystem:
linux for power macintosh, linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
kprobe does not handle events happening in real mode, all functions running with MMU disabled have to be blacklisted. Signed-off-by: Christophe Leroy <redacted> --- arch/powerpc/platforms/powermac/cache.S | 2 ++ arch/powerpc/platforms/powermac/sleep.S | 5 ++++- 2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/powermac/cache.S b/arch/powerpc/platforms/powermac/cache.S
index da69e0fcb4f1..ced225415486 100644
--- a/arch/powerpc/platforms/powermac/cache.S
+++ b/arch/powerpc/platforms/powermac/cache.S@@ -184,6 +184,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) mtlr r10 blr +_ASM_NOKPROBE_SYMBOL(flush_disable_75x) /* This code is for 745x processors */ flush_disable_745x:
@@ -351,4 +352,5 @@ END_FTR_SECTION_IFSET(CPU_FTR_L3CR) mtmsr r11 /* restore DR and EE */ isync blr +_ASM_NOKPROBE_SYMBOL(flush_disable_745x) #endif /* CONFIG_PPC_BOOK3S_32 */
diff --git a/arch/powerpc/platforms/powermac/sleep.S b/arch/powerpc/platforms/powermac/sleep.S
index bd6085b470b7..f9a680fdd9c4 100644
--- a/arch/powerpc/platforms/powermac/sleep.S
+++ b/arch/powerpc/platforms/powermac/sleep.S@@ -244,7 +244,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450) mtmsr r2 isync b 1b - +_ASM_NOKPROBE_SYMBOL(low_cpu_die) /* * Here is the resume code. */
@@ -282,6 +282,7 @@ _GLOBAL(core99_wake_up) lwz r1,0(r3) /* Pass thru to older resume code ... */ +_ASM_NOKPROBE_SYMBOL(core99_wake_up) /* * Here is the resume code for older machines. * r1 has the physical address of SL_PC(sp).
@@ -429,6 +430,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) lwz r0,4(r1) mtlr r0 blr +_ASM_NOKPROBE_SYMBOL(grackle_wake_up) turn_on_mmu: mflr r4
@@ -438,6 +440,7 @@ turn_on_mmu: sync isync rfi +_ASM_NOKPROBE_SYMBOL(turn_on_mmu) #endif /* defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ) */
--
2.25.0