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authorLinus Torvalds <torvalds@linux-foundation.org>2016-10-14 18:19:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-14 18:19:05 -0700
commitb26b5ef5ec7eab0e1d84c5b281e87b2f2a5e0586 (patch)
tree3fd57787765f05a19b85b384bd2a68cb4f9276d4
parent87dbe42a16b654e33665756c63e96c0fa73eb003 (diff)
parent2692a71bbd40160165e89d5505c5c28144ec5a42 (diff)
downloadlinux-sh-b26b5ef5ec7eab0e1d84c5b281e87b2f2a5e0586.tar.gz
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()
-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
-rw-r--r--arch/arc/kernel/signal.c8
-rw-r--r--arch/arm/include/asm/uaccess.h11
-rw-r--r--arch/arm/lib/copy_from_user.S9
-rw-r--r--arch/arm64/include/asm/uaccess.h10
-rw-r--r--arch/arm64/lib/copy_from_user.S7
-rw-r--r--arch/blackfin/include/asm/uaccess.h32
-rw-r--r--arch/score/kernel/traps.c1
-rw-r--r--fs/overlayfs/super.c11
-rw-r--r--fs/read_write.c29
-rw-r--r--fs/super.c43
-rw-r--r--lib/iov_iter.c22
14 files changed, 133 insertions, 98 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)
diff --git a/arch/arc/kernel/signal.c b/arch/arc/kernel/signal.c
index 6cb3736b6b83..d347bbc086fe 100644
--- a/arch/arc/kernel/signal.c
+++ b/arch/arc/kernel/signal.c
@@ -107,13 +107,13 @@ static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf)
struct user_regs_struct uregs;
err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
- if (!err)
- set_current_blocked(&set);
-
err |= __copy_from_user(&uregs.scratch,
&(sf->uc.uc_mcontext.regs.scratch),
sizeof(sf->uc.uc_mcontext.regs.scratch));
+ if (err)
+ return err;
+ set_current_blocked(&set);
regs->bta = uregs.scratch.bta;
regs->lp_start = uregs.scratch.lp_start;
regs->lp_end = uregs.scratch.lp_end;
@@ -138,7 +138,7 @@ static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf)
regs->r0 = uregs.scratch.r0;
regs->sp = uregs.scratch.sp;
- return err;
+ return 0;
}
static inline int is_do_ss_needed(unsigned int magic)
diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index a93c0f99acf7..1f59ea051bab 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 f549c57ea435..63e4c1ed0225 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
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
diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h
index 0a2a70096d8b..0eff88aa6d6a 100644
--- a/arch/blackfin/include/asm/uaccess.h
+++ b/arch/blackfin/include/asm/uaccess.h
@@ -163,18 +163,29 @@ static inline int bad_user_access_length(void)
: "a" (__ptr(ptr))); \
})
-#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
-#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
static inline unsigned long __must_check
+__copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+ memcpy(to, (const void __force *)from, n);
+ return 0;
+}
+
+static inline unsigned long __must_check
+__copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+ memcpy((void __force *)to, from, n);
+ SSYNC();
+ return 0;
+}
+
+static inline unsigned long __must_check
copy_from_user(void *to, const void __user *from, unsigned long n)
{
- if (likely(access_ok(VERIFY_READ, from, n))) {
- memcpy(to, (const void __force *)from, n);
- return 0;
- }
+ if (likely(access_ok(VERIFY_READ, from, n)))
+ return __copy_from_user(to, from, n);
memset(to, 0, n);
return n;
}
@@ -182,12 +193,9 @@ copy_from_user(void *to, const void __user *from, unsigned long n)
static inline unsigned long __must_check
copy_to_user(void __user *to, const void *from, unsigned long n)
{
- if (access_ok(VERIFY_WRITE, to, n))
- memcpy((void __force *)to, from, n);
- else
- return n;
- SSYNC();
- return 0;
+ if (likely(access_ok(VERIFY_WRITE, to, n)))
+ return __copy_to_user(to, from, n);
+ return n;
}
/*
diff --git a/arch/score/kernel/traps.c b/arch/score/kernel/traps.c
index 1517a7dcd6d9..5cea1e750cec 100644
--- a/arch/score/kernel/traps.c
+++ b/arch/score/kernel/traps.c
@@ -29,6 +29,7 @@
#include <asm/cacheflush.h>
#include <asm/irq.h>
#include <asm/irq_regs.h>
+#include <asm/uaccess.h>
unsigned long exception_handlers[32];
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 89182c4e2e30..bcf3965be819 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1303,6 +1303,12 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
if (!oe)
goto out_put_cred;
+ sb->s_magic = OVERLAYFS_SUPER_MAGIC;
+ sb->s_op = &ovl_super_operations;
+ sb->s_xattr = ovl_xattr_handlers;
+ sb->s_fs_info = ufs;
+ sb->s_flags |= MS_POSIXACL | MS_NOREMOTELOCK;
+
root_dentry = d_make_root(ovl_new_inode(sb, S_IFDIR));
if (!root_dentry)
goto out_free_oe;
@@ -1326,12 +1332,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
ovl_inode_init(d_inode(root_dentry), realinode, !!upperpath.dentry);
ovl_copyattr(realinode, d_inode(root_dentry));
- sb->s_magic = OVERLAYFS_SUPER_MAGIC;
- sb->s_op = &ovl_super_operations;
- sb->s_xattr = ovl_xattr_handlers;
sb->s_root = root_dentry;
- sb->s_fs_info = ufs;
- sb->s_flags |= MS_POSIXACL | MS_NOREMOTELOCK;
return 0;
diff --git a/fs/read_write.c b/fs/read_write.c
index 66215a7b17cf..190e0d362581 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -730,6 +730,35 @@ static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter,
/* A write operation does a read from user space and vice versa */
#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
+/**
+ * rw_copy_check_uvector() - Copy an array of &struct iovec from userspace
+ * into the kernel and check that it is valid.
+ *
+ * @type: One of %CHECK_IOVEC_ONLY, %READ, or %WRITE.
+ * @uvector: Pointer to the userspace array.
+ * @nr_segs: Number of elements in userspace array.
+ * @fast_segs: Number of elements in @fast_pointer.
+ * @fast_pointer: Pointer to (usually small on-stack) kernel array.
+ * @ret_pointer: (output parameter) Pointer to a variable that will point to
+ * either @fast_pointer, a newly allocated kernel array, or NULL,
+ * depending on which array was used.
+ *
+ * This function copies an array of &struct iovec of @nr_segs from
+ * userspace into the kernel and checks that each element is valid (e.g.
+ * it does not point to a kernel address or cause overflow by being too
+ * large, etc.).
+ *
+ * As an optimization, the caller may provide a pointer to a small
+ * on-stack array in @fast_pointer, typically %UIO_FASTIOV elements long
+ * (the size of this array, or 0 if unused, should be given in @fast_segs).
+ *
+ * @ret_pointer will always point to the array that was used, so the
+ * caller must take care not to call kfree() on it e.g. in case the
+ * @fast_pointer array was used and it was allocated on the stack.
+ *
+ * Return: The total number of bytes covered by the iovec array on success
+ * or a negative error code on error.
+ */
ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
unsigned long nr_segs, unsigned long fast_segs,
struct iovec *fast_pointer,
diff --git a/fs/super.c b/fs/super.c
index c2ff475c1711..c183835566c1 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1269,25 +1269,34 @@ EXPORT_SYMBOL(__sb_start_write);
static void sb_wait_write(struct super_block *sb, int level)
{
percpu_down_write(sb->s_writers.rw_sem + level-1);
- /*
- * We are going to return to userspace and forget about this lock, the
- * ownership goes to the caller of thaw_super() which does unlock.
- *
- * FIXME: we should do this before return from freeze_super() after we
- * called sync_filesystem(sb) and s_op->freeze_fs(sb), and thaw_super()
- * should re-acquire these locks before s_op->unfreeze_fs(sb). However
- * this leads to lockdep false-positives, so currently we do the early
- * release right after acquire.
- */
- percpu_rwsem_release(sb->s_writers.rw_sem + level-1, 0, _THIS_IP_);
}
-static void sb_freeze_unlock(struct super_block *sb)
+/*
+ * We are going to return to userspace and forget about these locks, the
+ * ownership goes to the caller of thaw_super() which does unlock().
+ */
+static void lockdep_sb_freeze_release(struct super_block *sb)
+{
+ int level;
+
+ for (level = SB_FREEZE_LEVELS - 1; level >= 0; level--)
+ percpu_rwsem_release(sb->s_writers.rw_sem + level, 0, _THIS_IP_);
+}
+
+/*
+ * Tell lockdep we are holding these locks before we call ->unfreeze_fs(sb).
+ */
+static void lockdep_sb_freeze_acquire(struct super_block *sb)
{
int level;
for (level = 0; level < SB_FREEZE_LEVELS; ++level)
percpu_rwsem_acquire(sb->s_writers.rw_sem + level, 0, _THIS_IP_);
+}
+
+static void sb_freeze_unlock(struct super_block *sb)
+{
+ int level;
for (level = SB_FREEZE_LEVELS - 1; level >= 0; level--)
percpu_up_write(sb->s_writers.rw_sem + level);
@@ -1379,10 +1388,11 @@ int freeze_super(struct super_block *sb)
}
}
/*
- * This is just for debugging purposes so that fs can warn if it
- * sees write activity when frozen is set to SB_FREEZE_COMPLETE.
+ * For debugging purposes so that fs can warn if it sees write activity
+ * when frozen is set to SB_FREEZE_COMPLETE, and for thaw_super().
*/
sb->s_writers.frozen = SB_FREEZE_COMPLETE;
+ lockdep_sb_freeze_release(sb);
up_write(&sb->s_umount);
return 0;
}
@@ -1399,7 +1409,7 @@ int thaw_super(struct super_block *sb)
int error;
down_write(&sb->s_umount);
- if (sb->s_writers.frozen == SB_UNFROZEN) {
+ if (sb->s_writers.frozen != SB_FREEZE_COMPLETE) {
up_write(&sb->s_umount);
return -EINVAL;
}
@@ -1409,11 +1419,14 @@ int thaw_super(struct super_block *sb)
goto out;
}
+ lockdep_sb_freeze_acquire(sb);
+
if (sb->s_op->unfreeze_fs) {
error = sb->s_op->unfreeze_fs(sb);
if (error) {
printk(KERN_ERR
"VFS:Filesystem thaw failed\n");
+ lockdep_sb_freeze_release(sb);
up_write(&sb->s_umount);
return error;
}
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 7312e7784611..f0c7f1481bae 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1139,6 +1139,28 @@ const void *dup_iter(struct iov_iter *new, struct iov_iter *old, gfp_t flags)
}
EXPORT_SYMBOL(dup_iter);
+/**
+ * import_iovec() - Copy an array of &struct iovec from userspace
+ * into the kernel, check that it is valid, and initialize a new
+ * &struct iov_iter iterator to access it.
+ *
+ * @type: One of %READ or %WRITE.
+ * @uvector: Pointer to the userspace array.
+ * @nr_segs: Number of elements in userspace array.
+ * @fast_segs: Number of elements in @iov.
+ * @iov: (input and output parameter) Pointer to pointer to (usually small
+ * on-stack) kernel array.
+ * @i: Pointer to iterator that will be initialized on success.
+ *
+ * If the array pointed to by *@iov is large enough to hold all @nr_segs,
+ * then this function places %NULL in *@iov on return. Otherwise, a new
+ * array will be allocated and the result placed in *@iov. This means that
+ * the caller may call kfree() on *@iov regardless of whether the small
+ * on-stack array was used or not (and regardless of whether this function
+ * returns an error or not).
+ *
+ * Return: 0 on success or negative error code on error.
+ */
int import_iovec(int type, const struct iovec __user * uvector,
unsigned nr_segs, unsigned fast_segs,
struct iovec **iov, struct iov_iter *i)