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x86/entry: Increase entry_stack size to a full page

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[ Upstream commit c7aadc09321d8f9a1d3bd1e6d8a47222ecddf6c5 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Peter Zijlstra 2020-06-17 18:25:57 +02:00 • committed by Greg Kroah-Hartman
commit 4e9631a908
1 changed files with 1 additions and 1 deletions
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arch/x86/include/asm/processor.h
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@ -334,7 +334,7 @@ struct x86_hw_tss {
#define INVALID_IO_BITMAP_OFFSET 0x8000
struct entry_stack {
unsigned long words[64];
char stack[PAGE_SIZE];
};
struct entry_stack_page {