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UPSTREAM: arm64: move untagged_addr macro from uaccess.h to memory.h

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(Upstream commit 9c23f84723).

Move the untagged_addr() macro from arch/arm64/include/asm/uaccess.h
to arch/arm64/include/asm/memory.h to be later reused by KASAN.

Also make the untagged_addr() macro accept all kinds of address types
(void *, unsigned long, etc.). This allows not to specify type casts in
each place where the macro is used. This is done by using __typeof__.

Link: http://lkml.kernel.org/r/2e9ef8d2ed594106eca514b268365b5419113f6a.1544099024.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Bug: 128674696
Change-Id: I1dc81f9698ade663dcf5a30a918eed29a83d8595
This commit is contained in:
Andrey Konovalov
2018-12-28 00:30:12 -08:00
committed by Alistair Delva
parent fe1cf9c054
commit b32b4dfdb2
2 changed files with 8 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
arch/arm64/include/asm/memory.h
View File

@@ -215,6 +215,14 @@ static inline unsigned long kaslr_offset(void)
*/
#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
/*
* When dealing with data aborts, watchpoints, or instruction traps we may end
* up with a tagged userland pointer. Clear the tag to get a sane pointer to
* pass on to access_ok(), for instance.
*/
#define untagged_addr(addr) \
((__typeof__(addr))sign_extend64((u64)(addr), 55))
/*
* Physical vs virtual RAM address space conversion. These are
* private definitions which should NOT be used outside memory.h

7
arch/arm64/include/asm/uaccess.h
View File

@@ -97,13 +97,6 @@ static inline unsigned long __range_ok(const void __user *addr, unsigned long si
return ret;
}
/*
* When dealing with data aborts, watchpoints, or instruction traps we may end
* up with a tagged userland pointer. Clear the tag to get a sane pointer to
* pass on to access_ok(), for instance.
*/
#define untagged_addr(addr) sign_extend64(addr, 55)
#define access_ok(type, addr, size) __range_ok(addr, size)
#define user_addr_max get_fs