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authorAndi Kleen <ak@suse.de>2006-10-05 18:47:22 +0200
committerAndi Kleen <andi@basil.nowhere.org>2006-10-05 18:47:22 +0200
commit51ec28e1b2cb267a09a0b8eac1ccf8d61b7268bf (patch)
tree4686d439a49b98b98fc5048641ddfb50db3fbcd6 /arch/x86_64
parentf015c6c4d733f68cbc1c5d231bb158abaa5c9606 (diff)
downloadop-kernel-dev-51ec28e1b2cb267a09a0b8eac1ccf8d61b7268bf.zip
op-kernel-dev-51ec28e1b2cb267a09a0b8eac1ccf8d61b7268bf.tar.gz
[PATCH] x86: Terminate the kernel stacks for the unwinder
Always make sure RIP/EIP is 0 in the registers stored on the top of the stack of a kernel thread. This makes sure the unwinder code won't try a fallback but knows the stack has ended. AK: this patch is a bit mysterious. in theory they should be terminated anyways, but it seems to fix at least one crash. Anyways double termination probably doesn't hurt. Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/entry.S5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index b8285cf..ab9b2c4 100644
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -978,6 +978,11 @@ ENTRY(kernel_thread)
call do_fork
movq %rax,RAX(%rsp)
xorl %edi,%edi
+ test %rax,%rax
+ jnz 1f
+ /* terminate stack in child */
+ movq %rdi,RIP(%rsp)
+1:
/*
* It isn't worth to check for reschedule here,
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