Re: [RFC][PATCH] x86: Verify access_ok() context

[David Smith]

If you call access_ok() with page faulting disabled, you'll still see this new warning. If you put that new access_ok() call in a module that gets loaded/unloaded, you see one warning for every module load, which gets a bit annoying.

How about modifying it like this:

---
From: David Smith <dsmith@xxxxxxxxxx>
Date: Mon, 16 Jan 2017 14:07:31 -0600
Subject: [PATCH] Relax x86 new access_ok() warning a bit.

Signed-off-by: David Smith <dsmith@xxxxxxxxxx>
---
 arch/x86/include/asm/uaccess.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
index ea148313570f..0cbd3cca5e7b 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -69,7 +69,7 @@ static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, un
 })
 
 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
-# define WARN_ON_IN_IRQ()	WARN_ON_ONCE(!in_task())
+# define WARN_ON_IN_IRQ()	WARN_ON_ONCE(!in_task() && !pagefault_disabled())
 #else
 # define WARN_ON_IN_IRQ()
 #endif
-- 


-- 
David Smith
dsmith@xxxxxxxxxx
Red Hat
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