[PATCH 15/52] arm64: uaccess: Mask __user pointers for __arch_{clear, copy_*}_user
From: Alex Shi <hidden>
Date: 2018-02-26 08:36:39
Also in:
lkml, stable
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
From: Will Deacon <redacted>
Rewritting from commit f71c2ffcb20d upstream. On LTS 4.9, there has no
raw_copy_from/to_user, neither __copy_user_flushcache, and it isn't good
idead to pick up them. The following is origin commit log, that's also
applicable for the new patch.
Like we've done for get_user and put_user, ensure that user pointers
are masked before invoking the underlying __arch_{clear,copy_*}_user
operations.
Signed-off-by: Will Deacon [off-list ref]
Signed-off-by: Catalin Marinas [off-list ref]
Signed-off-by: Alex Shi <redacted>
---
arch/arm64/include/asm/uaccess.h | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
index ffa4e39..fbf4ce4 100644
--- a/arch/arm64/include/asm/uaccess.h
+++ b/arch/arm64/include/asm/uaccess.h@@ -357,14 +357,14 @@ static inline unsigned long __must_check __copy_from_user(void *to, const void _ { kasan_check_write(to, n); check_object_size(to, n, false); - return __arch_copy_from_user(to, from, n); + return __arch_copy_from_user(to, __uaccess_mask_ptr(from), n); } static inline unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n) { kasan_check_read(from, n); check_object_size(from, n, true); - return __arch_copy_to_user(to, from, n); + return __arch_copy_to_user(__uaccess_mask_ptr(to), from, n); } static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)
@@ -374,7 +374,7 @@ static inline unsigned long __must_check copy_from_user(void *to, const void __u check_object_size(to, n, false); if (access_ok(VERIFY_READ, from, n)) { - res = __arch_copy_from_user(to, from, n); + res = __arch_copy_from_user(to, __uaccess_mask_ptr(from), n); } if (unlikely(res)) memset(to + (n - res), 0, res);
@@ -387,7 +387,7 @@ static inline unsigned long __must_check copy_to_user(void __user *to, const voi check_object_size(from, n, true); if (access_ok(VERIFY_WRITE, to, n)) { - n = __arch_copy_to_user(to, from, n); + n = __arch_copy_to_user(__uaccess_mask_ptr(to), from, n); } return n; }
@@ -395,7 +395,7 @@ static inline unsigned long __must_check copy_to_user(void __user *to, const voi static inline unsigned long __must_check copy_in_user(void __user *to, const void __user *from, unsigned long n) { if (access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, to, n)) - n = __copy_in_user(to, from, n); + n = __copy_in_user(__uaccess_mask_ptr(to), __uaccess_mask_ptr(from), n); return n; }
--
2.7.4