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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-15 04:19:05 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-15 04:19:05 +0300 |
commit | b26b5ef5ec7eab0e1d84c5b281e87b2f2a5e0586 (patch) | |
tree | 3fd57787765f05a19b85b384bd2a68cb4f9276d4 /lib/iov_iter.c | |
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 'lib/iov_iter.c')
-rw-r--r-- | lib/iov_iter.c | 22 |
1 files changed, 22 insertions, 0 deletions
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) |