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authorLinus Torvalds <torvalds@linux-foundation.org>2018-12-09 14:21:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-09 14:21:33 -0800
commitebbd30004d6cfa747723b3ac6ee1a97795f797ba (patch)
tree08bae689ca8ba7fd7ea5782436da3974db6f4313
parent4b04e73a78c5c89dc1a75fb35dea6c947c1d2ac7 (diff)
parenta50480cb6d61d5c5fc13308479407b628b6bc1c5 (diff)
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull kprobes fixes from Ingo Molnar: "Two kprobes fixes: a blacklist fix and an instruction patching related corruption fix" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: kprobes/x86: Blacklist non-attachable interrupt functions kprobes/x86: Fix instruction patching corruption when copying more than one RIP-relative instruction
-rw-r--r--arch/x86/entry/entry_64.S4
-rw-r--r--arch/x86/kernel/kprobes/opt.c2
2 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index ce25d84023c0..1f0efdb7b629 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -566,6 +566,7 @@ ENTRY(interrupt_entry)
ret
END(interrupt_entry)
+_ASM_NOKPROBE(interrupt_entry)
/* Interrupt entry/exit. */
@@ -766,6 +767,7 @@ native_irq_return_ldt:
jmp native_irq_return_iret
#endif
END(common_interrupt)
+_ASM_NOKPROBE(common_interrupt)
/*
* APIC interrupts.
@@ -780,6 +782,7 @@ ENTRY(\sym)
call \do_sym /* rdi points to pt_regs */
jmp ret_from_intr
END(\sym)
+_ASM_NOKPROBE(\sym)
.endm
/* Make sure APIC interrupt handlers end up in the irqentry section: */
@@ -960,6 +963,7 @@ ENTRY(\sym)
jmp error_exit
.endif
+_ASM_NOKPROBE(\sym)
END(\sym)
.endm
diff --git a/arch/x86/kernel/kprobes/opt.c b/arch/x86/kernel/kprobes/opt.c
index 40b16b270656..6adf6e6c2933 100644
--- a/arch/x86/kernel/kprobes/opt.c
+++ b/arch/x86/kernel/kprobes/opt.c
@@ -189,7 +189,7 @@ static int copy_optimized_instructions(u8 *dest, u8 *src, u8 *real)
int len = 0, ret;
while (len < RELATIVEJUMP_SIZE) {
- ret = __copy_instruction(dest + len, src + len, real, &insn);
+ ret = __copy_instruction(dest + len, src + len, real + len, &insn);
if (!ret || !can_boost(&insn, src + len))
return -EINVAL;
len += ret;