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| author |   Borislav Petkov <bp@suse.de> | 2016-03-31 16:21:02 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2016-04-13 11:52:19 +0200 |
| commit | 91ed140d6c1e168b11bbbddac4f6066f40a0c6b5 (patch) | |
| tree | e583014dbc2759b04ba3e1ff09af0e1683f09ad7 /include/asm-generic | |
| parent | x86/extable: Add a comment about early exception handlers (diff) | |
| download | linux-dev-91ed140d6c1e168b11bbbddac4f6066f40a0c6b5.tar.xz linux-dev-91ed140d6c1e168b11bbbddac4f6066f40a0c6b5.zip | |
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.h | 4 |
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 |