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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-14 18:19:05 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-14 18:19:05 -0700 |
| commit | b26b5ef5ec7eab0e1d84c5b281e87b2f2a5e0586 (patch) | |
| tree | 3fd57787765f05a19b85b384bd2a68cb4f9276d4 /arch/arm64 | |
| parent | 87dbe42a16b654e33665756c63e96c0fa73eb003 (diff) | |
| parent | 2692a71bbd40160165e89d5505c5c28144ec5a42 (diff) | |
| download | linux-b26b5ef5ec7eab0e1d84c5b281e87b2f2a5e0586.tar.bz2 | |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull more misc uaccess and vfs updates from Al Viro:
"The rest of the stuff from -next (more uaccess work) + assorted fixes"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
score: traps: Add missing include file to fix build error
fs/super.c: don't fool lockdep in freeze_super() and thaw_super() paths
fs/super.c: fix race between freeze_super() and thaw_super()
overlayfs: Fix setting IOP_XATTR flag
iov_iter: kernel-doc import_iovec() and rw_copy_check_uvector()
blackfin: no access_ok() for __copy_{to,from}_user()
arm64: don't zero in __copy_from_user{,_inatomic}
arm: don't zero in __copy_from_user_inatomic()/__copy_from_user()
arc: don't leak bits of kernel stack into coredump
alpha: get rid of tail-zeroing in __copy_user()
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/uaccess.h | 10 | ||||
| -rw-r--r-- | arch/arm64/lib/copy_from_user.S | 7 |
2 files changed, 7 insertions, 10 deletions
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index c47257c91b77..bcaf6fba1b65 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -278,14 +278,16 @@ static inline unsigned long __must_check __copy_to_user(void __user *to, const v static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n) { + unsigned long res = n; kasan_check_write(to, n); if (access_ok(VERIFY_READ, from, n)) { check_object_size(to, n, false); - n = __arch_copy_from_user(to, from, n); - } else /* security hole - plug it */ - memset(to, 0, n); - return n; + res = __arch_copy_from_user(to, from, n); + } + if (unlikely(res)) + memset(to + (n - res), 0, res); + return res; } static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n) diff --git a/arch/arm64/lib/copy_from_user.S b/arch/arm64/lib/copy_from_user.S index 0b90497d4424..4fd67ea03bb0 100644 --- a/arch/arm64/lib/copy_from_user.S +++ b/arch/arm64/lib/copy_from_user.S @@ -79,11 +79,6 @@ ENDPROC(__arch_copy_from_user) .section .fixup,"ax" .align 2 -9998: - sub x0, end, dst -9999: - strb wzr, [dst], #1 // zero remaining buffer space - cmp dst, end - b.lo 9999b +9998: sub x0, end, dst // bytes not copied ret .previous |