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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-15 01:19:05 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-15 01:19:05 (GMT) |
| commit | b26b5ef5ec7eab0e1d84c5b281e87b2f2a5e0586 (patch) | |
| tree | 3fd57787765f05a19b85b384bd2a68cb4f9276d4 /arch/arm | |
| parent | 87dbe42a16b654e33665756c63e96c0fa73eb003 (diff) | |
| parent | 2692a71bbd40160165e89d5505c5c28144ec5a42 (diff) | |
| download | linux-b26b5ef5ec7eab0e1d84c5b281e87b2f2a5e0586.tar.xz | |
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/arm')
| -rw-r--r-- | arch/arm/include/asm/uaccess.h | 11 | ||||
| -rw-r--r-- | arch/arm/lib/copy_from_user.S | 9 |
2 files changed, 9 insertions, 11 deletions
diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h index a93c0f9..1f59ea05 100644 --- a/arch/arm/include/asm/uaccess.h +++ b/arch/arm/include/asm/uaccess.h @@ -533,11 +533,12 @@ __clear_user(void __user *addr, unsigned long n) static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n) { - if (access_ok(VERIFY_READ, from, n)) - n = __copy_from_user(to, from, n); - else /* security hole - plug it */ - memset(to, 0, n); - return n; + unsigned long res = n; + if (likely(access_ok(VERIFY_READ, from, n))) + res = __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/arm/lib/copy_from_user.S b/arch/arm/lib/copy_from_user.S index f549c57..63e4c1e 100644 --- a/arch/arm/lib/copy_from_user.S +++ b/arch/arm/lib/copy_from_user.S @@ -100,12 +100,9 @@ EXPORT_SYMBOL(arm_copy_from_user) .pushsection .fixup,"ax" .align 0 copy_abort_preamble - ldmfd sp!, {r1, r2} - sub r3, r0, r1 - rsb r1, r3, r2 - str r1, [sp] - bl __memzero - ldr r0, [sp], #4 + ldmfd sp!, {r1, r2, r3} + sub r0, r0, r1 + rsb r0, r0, r2 copy_abort_end .popsection |