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authorLinus Torvalds <torvalds@linux-foundation.org>2016-10-15 03:19:05 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-15 03:19:05 +0200
commitb26b5ef5ec7eab0e1d84c5b281e87b2f2a5e0586 (patch)
tree3fd57787765f05a19b85b384bd2a68cb4f9276d4 /arch/alpha
parentMerge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6 (diff)
parentMerge branch 'work.uaccess' into for-linus (diff)
downloadlinux-b26b5ef5ec7eab0e1d84c5b281e87b2f2a5e0586.tar.xz
linux-b26b5ef5ec7eab0e1d84c5b281e87b2f2a5e0586.zip
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/alpha')
-rw-r--r--arch/alpha/include/asm/uaccess.h9
-rw-r--r--arch/alpha/lib/copy_user.S16
-rw-r--r--arch/alpha/lib/ev6-copy_user.S23
3 files changed, 7 insertions, 41 deletions
diff --git a/arch/alpha/include/asm/uaccess.h b/arch/alpha/include/asm/uaccess.h
index 466e42e96bfa..94f587535dee 100644
--- a/arch/alpha/include/asm/uaccess.h
+++ b/arch/alpha/include/asm/uaccess.h
@@ -396,11 +396,12 @@ copy_to_user(void __user *to, const void *from, long n)
extern inline long
copy_from_user(void *to, const void __user *from, long n)
{
+ long res = n;
if (likely(__access_ok((unsigned long)from, n, get_fs())))
- n = __copy_tofrom_user_nocheck(to, (__force void *)from, n);
- else
- memset(to, 0, n);
- return n;
+ res = __copy_from_user_inatomic(to, from, n);
+ if (unlikely(res))
+ memset(to + (n - res), 0, res);
+ return res;
}
extern void __do_clear_user(void);
diff --git a/arch/alpha/lib/copy_user.S b/arch/alpha/lib/copy_user.S
index 2238068b1b40..509f62b65311 100644
--- a/arch/alpha/lib/copy_user.S
+++ b/arch/alpha/lib/copy_user.S
@@ -126,22 +126,8 @@ $65:
bis $31,$31,$0
$41:
$35:
-$exitout:
- ret $31,($28),1
-
$exitin:
- /* A stupid byte-by-byte zeroing of the rest of the output
- buffer. This cures security holes by never leaving
- random kernel data around to be copied elsewhere. */
-
- mov $0,$1
-$101:
- EXO ( ldq_u $2,0($6) )
- subq $1,1,$1
- mskbl $2,$6,$2
- EXO ( stq_u $2,0($6) )
- addq $6,1,$6
- bgt $1,$101
+$exitout:
ret $31,($28),1
.end __copy_user
diff --git a/arch/alpha/lib/ev6-copy_user.S b/arch/alpha/lib/ev6-copy_user.S
index debcc3b6b704..be720b518af9 100644
--- a/arch/alpha/lib/ev6-copy_user.S
+++ b/arch/alpha/lib/ev6-copy_user.S
@@ -228,33 +228,12 @@ $dirtyentry:
bgt $0,$onebyteloop # U .. .. .. : U L U L
$zerolength:
+$exitin:
$exitout: # Destination for exception recovery(?)
nop # .. .. .. E
nop # .. .. E ..
nop # .. E .. ..
ret $31,($28),1 # L0 .. .. .. : L U L U
-$exitin:
-
- /* A stupid byte-by-byte zeroing of the rest of the output
- buffer. This cures security holes by never leaving
- random kernel data around to be copied elsewhere. */
-
- nop
- nop
- nop
- mov $0,$1
-
-$101:
- EXO ( stb $31,0($6) ) # L
- subq $1,1,$1 # E
- addq $6,1,$6 # E
- bgt $1,$101 # U
-
- nop
- nop
- nop
- ret $31,($28),1 # L0
-
.end __copy_user
EXPORT_SYMBOL(__copy_user)