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authorBorislav Petkov <bp@suse.de>2016-03-31 16:21:02 +0200
committerIngo Molnar <mingo@kernel.org>2016-04-13 11:52:19 +0200
commit91ed140d6c1e168b11bbbddac4f6066f40a0c6b5 (patch)
treee583014dbc2759b04ba3e1ff09af0e1683f09ad7 /include/asm-generic
parent60a0e2039e3df6c0a2b896bd78af36ff36fb629c (diff)
x86/asm: Make sure verify_cpu() has a good stack
04633df0c43d ("x86/cpu: Call verify_cpu() after having entered long mode too") added the call to verify_cpu() for sanitizing CPU configuration. The latter uses the stack minimally and it can happen that we land in startup_64() directly from a 64-bit bootloader. Then we want to use our own, known good stack. Do that. APs don't need this as the trampoline sets up a stack for them. Reported-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mika Penttilä <mika.penttila@nextfour.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1459434062-31055-1-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/vmlinux.lds.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 339125bb4d2c..6a67ab94b553 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -245,7 +245,9 @@
#define INIT_TASK_DATA(align) \
. = ALIGN(align); \
- *(.data..init_task)
+ VMLINUX_SYMBOL(__start_init_task) = .; \
+ *(.data..init_task) \
+ VMLINUX_SYMBOL(__end_init_task) = .;
/*
* Read only Data