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authorPeter Zijlstra <peterz@infradead.org>2020-06-17 18:25:57 +0200
committerPeter Zijlstra <peterz@infradead.org>2020-06-25 13:45:40 +0200
commitc7aadc09321d8f9a1d3bd1e6d8a47222ecddf6c5 (patch)
treed3ef22ecfa4ca3a19b7ae3b2780ba4611b5a67d2 /arch/x86/include
parente3a9e681adb779b39565a28b3252c3be1033f994 (diff)
downloadlinux-c7aadc09321d8f9a1d3bd1e6d8a47222ecddf6c5.tar.gz
x86/entry: Increase entry_stack size to a full page
Marco crashed in bad_iret with a Clang11/KCSAN build due to overflowing the stack. Now that we run C code on it, expand it to a full page. Suggested-by: Andy Lutomirski <luto@amacapital.net> Reported-by: Marco Elver <elver@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Lai Jiangshan <jiangshanlai@gmail.com> Tested-by: Marco Elver <elver@google.com> Link: https://lkml.kernel.org/r/20200618144801.819246178@infradead.org
Diffstat (limited to 'arch/x86/include')
-rw-r--r--arch/x86/include/asm/processor.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 42cd333616c4..03b7c4ca425a 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -370,7 +370,7 @@ struct x86_hw_tss {
#define IO_BITMAP_OFFSET_INVALID (__KERNEL_TSS_LIMIT + 1)
struct entry_stack {
- unsigned long words[64];
+ char stack[PAGE_SIZE];
};
struct entry_stack_page {