Merge branch 'sh4-sid' into 'sid'
[sh4]: Check for kprobe trap number before trying to handle a kprobe trap See merge request kernel-team/linux!152
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commit
2a02d306dd
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@ -1,5 +1,8 @@
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linux (4.19.37-6) UNRELEASED; urgency=medium
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[ John Paul Adrian Glaubitz ]
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* [sh4]: Check for kprobe trap number before trying to handle a kprobe trap
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[ Salvatore Bonaccorso ]
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* tcp: refine memory limit test in tcp_fragment() (Closes: #930904)
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@ -0,0 +1,40 @@
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From 6d7cc74d8aad33589c6cc6f38e33c4284abc07b8 Mon Sep 17 00:00:00 2001
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From: Michael Karcher <kernel@mkarcher.dialup.fu-berlin.de>
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Date: Wed, 12 Jun 2019 15:08:37 +0200
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Subject: [PATCH 1/1] arch/sh: Check for kprobe trap number before trying to
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handle a kprobe trap
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Origin: https://marc.info/?l=linux-sh&m=156034655921917&w=2
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The DIE_TRAP notifier chain is run both for kprobe traps and for BUG/WARN
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traps. The kprobe code assumes to be only called for
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BREAKPOINT_INSTRUCTION, and concludes to have hit a concurrently removed
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kprobe if it finds anything else at the faulting locations. This includes
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TRAPA_BUG_OPCODE used for BUG and WARN.
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The consequence is that kprobe_handler returns 1. This makes
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kprobe_exceptions_notify return NOTIFY_STOP, and prevents handling the BUG
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statement. This also prevents moving $pc away from the trap instruction,
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so the system locks up in an endless loop
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Signed-off-by: Michael Karcher <kernel@mkarcher.dialup.fu-berlin.de>
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---
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arch/sh/kernel/kprobes.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/arch/sh/kernel/kprobes.c b/arch/sh/kernel/kprobes.c
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index 1f8c0d30567f..318296f48f1a 100644
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--- a/arch/sh/kernel/kprobes.c
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+++ b/arch/sh/kernel/kprobes.c
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@@ -485,7 +485,8 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
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struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
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addr = (kprobe_opcode_t *) (args->regs->pc);
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- if (val == DIE_TRAP) {
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+ if (val == DIE_TRAP &&
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+ args->trapnr == (BREAKPOINT_INSTRUCTION & 0xff)) {
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if (!kprobe_running()) {
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if (kprobe_handler(args->regs)) {
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ret = NOTIFY_STOP;
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--
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2.11.0
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@ -69,6 +69,7 @@ bugfix/x86/platform-x86-ideapad-laptop-add-ideapad-v510-15ikb-t.patch
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bugfix/x86/platform-x86-ideapad-laptop-add-several-models-to-no.patch
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bugfix/x86/perf-tools-fix-unwind-build-on-i386.patch
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bugfix/sh/sh-boot-do-not-use-hyphen-in-exported-variable-name.patch
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bugfix/sh/sh-check-for-kprobe-trap-number-before-trying-to-handle-a-kprobe-trap.patch
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bugfix/powerpc/powerpc-lib-sstep-fix-building-for-powerpcspe.patch
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bugfix/powerpc/powerpc-lib-makefile-don-t-pull-in-quad.o-for-32-bit.patch
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bugfix/arm/arm-mm-export-__sync_icache_dcache-for-xen-privcmd.patch
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