The patch titled
x86_64: vunmap correct address in text_poke()(kprobes)
has been added to the -mm tree. Its filename is
x86_64-vunmap-correct-address-in-text_pokekprobes.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: x86_64: vunmap correct address in text_poke()(kprobes)
From: Srinivasa Ds <srinivasa@xxxxxxxxxx>
Resending patch according to Prasanna's suggestion, CC'ing Andi Kleen.
Hit this issue when testing kprobes on x86_64 systems. We need to align
vunmap() address to a page boundary in text_poke(). Patch below
==============================
Trying to vfree() bad address (ffffc20002233199)
WARNING: at mm/vmalloc.c:330 __vunmap()
Call Trace:
[<ffffffff8023d199>] sys_gettimeofday+0x0/0x62
[<ffffffff8047636c>] text_poke+0x119/0x124
[<ffffffff80476b42>] arch_arm_kprobe+0x1c/0x21
[<ffffffff80477cfd>] __register_kprobe+0x28a/0x2ed
[<ffffffff8815a039>] :gettimeofday:kprobe_init+0x39/0x65
[<ffffffff8025b5cf>] sys_init_module+0x1626/0x1788
[<ffffffff802aaf12>] dput+0x3f/0xfa
[<ffffffff8026bf91>] audit_syscall_entry+0x141/0x174
[<ffffffff8020bee5>] tracesys+0xdc/0xe1
========================================
Signed-off-by: Srinivasa DS <srinivasa@xxxxxxxxxx>
Signed-off-by: Suzuki K P <suzuki@xxxxxxxxxx>
Signed-off-by: Prasanna S Panchamukhi <prasanna@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/i386/kernel/alternative.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN arch/i386/kernel/alternative.c~x86_64-vunmap-correct-address-in-text_pokekprobes arch/i386/kernel/alternative.c
--- a/arch/i386/kernel/alternative.c~x86_64-vunmap-correct-address-in-text_pokekprobes
+++ a/arch/i386/kernel/alternative.c
@@ -447,5 +447,5 @@ void __kprobes text_poke(void *oaddr, un
if (cpu_has_clflush)
asm("clflush (%0) " :: "r" (oaddr) : "memory");
if (addr != oaddr)
- vunmap(addr);
+ vunmap((u8 *)((unsigned long)addr & PAGE_MASK));
}
_
Patches currently in -mm which might be from srinivasa@xxxxxxxxxx are
x86_64-vunmap-correct-address-in-text_pokekprobes.patch
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