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From: Ingo Molnar <mingo@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Borislav Petkov <bp@alien8.de>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: [GIT PULL] Stack randomization fix
Date: Sat, 15 May 2021 09:34:53 +0200	[thread overview]
Message-ID: <20210515073453.GA78379@gmail.com> (raw)

Linus,

Please pull the latest core/urgent git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-urgent-2021-05-15

   # HEAD: 2515dd6ce8e545b0b2eece84920048ef9ed846c4 stack: Replace "o" output with "r" input constraint

Fix an assembly constraint that affected LLVM up to version 12.

 Thanks,

	Ingo

------------------>
Nick Desaulniers (1):
      stack: Replace "o" output with "r" input constraint


 include/linux/randomize_kstack.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/randomize_kstack.h b/include/linux/randomize_kstack.h
index fd80fab663a9..bebc911161b6 100644
--- a/include/linux/randomize_kstack.h
+++ b/include/linux/randomize_kstack.h
@@ -38,7 +38,7 @@ void *__builtin_alloca(size_t size);
 		u32 offset = raw_cpu_read(kstack_offset);		\
 		u8 *ptr = __builtin_alloca(KSTACK_OFFSET_MAX(offset));	\
 		/* Keep allocation even after "ptr" loses scope. */	\
-		asm volatile("" : "=o"(*ptr) :: "memory");		\
+		asm volatile("" :: "r"(ptr) : "memory");		\
 	}								\
 } while (0)
 

             reply	other threads:[~2021-05-15  7:35 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-15  7:34 Ingo Molnar [this message]
2021-05-15 17:13 ` [GIT PULL] Stack randomization fix Linus Torvalds
2021-05-16  7:29   ` Ingo Molnar
2021-05-21 18:12     ` Kees Cook
2021-05-17  9:12   ` David Laight
2021-05-15 17:55 ` pr-tracker-bot

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