mirror of
https://github.com/Fishwaldo/Star64_linux.git
synced 2025-06-20 21:51:05 +00:00
Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull compat iovec cleanups from Al Viro:
"Christoph's series around import_iovec() and compat variant thereof"
* 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
security/keys: remove compat_keyctl_instantiate_key_iov
mm: remove compat_process_vm_{readv,writev}
fs: remove compat_sys_vmsplice
fs: remove the compat readv/writev syscalls
fs: remove various compat readv/writev helpers
iov_iter: transparently handle compat iovecs in import_iovec
iov_iter: refactor rw_copy_check_uvector and import_iovec
iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c
compat.h: fix a spelling error in <linux/compat.h>
This commit is contained in:
Linus Torvalds
commit
85ed13e78d
30 changed files with 300 additions and 716 deletions
362
fs/read_write.c
362
fs/read_write.c
|
|
@ -760,185 +760,6 @@ static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter,
|
|||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* rw_copy_check_uvector() - Copy an array of &struct iovec from userspace
|
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* into the kernel and check that it is valid.
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*
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* @type: One of %CHECK_IOVEC_ONLY, %READ, or %WRITE.
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* @uvector: Pointer to the userspace array.
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* @nr_segs: Number of elements in userspace array.
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* @fast_segs: Number of elements in @fast_pointer.
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* @fast_pointer: Pointer to (usually small on-stack) kernel array.
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* @ret_pointer: (output parameter) Pointer to a variable that will point to
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* either @fast_pointer, a newly allocated kernel array, or NULL,
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* depending on which array was used.
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*
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* This function copies an array of &struct iovec of @nr_segs from
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* userspace into the kernel and checks that each element is valid (e.g.
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* it does not point to a kernel address or cause overflow by being too
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* large, etc.).
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*
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* As an optimization, the caller may provide a pointer to a small
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* on-stack array in @fast_pointer, typically %UIO_FASTIOV elements long
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* (the size of this array, or 0 if unused, should be given in @fast_segs).
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*
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||||
* @ret_pointer will always point to the array that was used, so the
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* caller must take care not to call kfree() on it e.g. in case the
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* @fast_pointer array was used and it was allocated on the stack.
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*
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* Return: The total number of bytes covered by the iovec array on success
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* or a negative error code on error.
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*/
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ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
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unsigned long nr_segs, unsigned long fast_segs,
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struct iovec *fast_pointer,
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struct iovec **ret_pointer)
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{
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unsigned long seg;
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ssize_t ret;
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struct iovec *iov = fast_pointer;
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/*
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* SuS says "The readv() function *may* fail if the iovcnt argument
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* was less than or equal to 0, or greater than {IOV_MAX}. Linux has
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* traditionally returned zero for zero segments, so...
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*/
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if (nr_segs == 0) {
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ret = 0;
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goto out;
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}
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/*
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* First get the "struct iovec" from user memory and
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* verify all the pointers
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*/
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if (nr_segs > UIO_MAXIOV) {
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ret = -EINVAL;
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goto out;
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}
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if (nr_segs > fast_segs) {
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iov = kmalloc_array(nr_segs, sizeof(struct iovec), GFP_KERNEL);
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if (iov == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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}
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if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) {
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ret = -EFAULT;
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goto out;
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}
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/*
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* According to the Single Unix Specification we should return EINVAL
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* if an element length is < 0 when cast to ssize_t or if the
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* total length would overflow the ssize_t return value of the
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* system call.
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*
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* Linux caps all read/write calls to MAX_RW_COUNT, and avoids the
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* overflow case.
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*/
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ret = 0;
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for (seg = 0; seg < nr_segs; seg++) {
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void __user *buf = iov[seg].iov_base;
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ssize_t len = (ssize_t)iov[seg].iov_len;
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/* see if we we're about to use an invalid len or if
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* it's about to overflow ssize_t */
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if (len < 0) {
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ret = -EINVAL;
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goto out;
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}
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if (type >= 0
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&& unlikely(!access_ok(buf, len))) {
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ret = -EFAULT;
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goto out;
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}
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if (len > MAX_RW_COUNT - ret) {
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len = MAX_RW_COUNT - ret;
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iov[seg].iov_len = len;
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}
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ret += len;
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}
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out:
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*ret_pointer = iov;
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return ret;
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}
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#ifdef CONFIG_COMPAT
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ssize_t compat_rw_copy_check_uvector(int type,
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const struct compat_iovec __user *uvector, unsigned long nr_segs,
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unsigned long fast_segs, struct iovec *fast_pointer,
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struct iovec **ret_pointer)
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{
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compat_ssize_t tot_len;
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struct iovec *iov = *ret_pointer = fast_pointer;
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ssize_t ret = 0;
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int seg;
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/*
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* SuS says "The readv() function *may* fail if the iovcnt argument
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* was less than or equal to 0, or greater than {IOV_MAX}. Linux has
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* traditionally returned zero for zero segments, so...
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*/
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if (nr_segs == 0)
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goto out;
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ret = -EINVAL;
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if (nr_segs > UIO_MAXIOV)
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goto out;
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if (nr_segs > fast_segs) {
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ret = -ENOMEM;
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iov = kmalloc_array(nr_segs, sizeof(struct iovec), GFP_KERNEL);
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if (iov == NULL)
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goto out;
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}
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*ret_pointer = iov;
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ret = -EFAULT;
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if (!access_ok(uvector, nr_segs*sizeof(*uvector)))
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goto out;
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/*
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* Single unix specification:
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* We should -EINVAL if an element length is not >= 0 and fitting an
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* ssize_t.
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*
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* In Linux, the total length is limited to MAX_RW_COUNT, there is
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* no overflow possibility.
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*/
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tot_len = 0;
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ret = -EINVAL;
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for (seg = 0; seg < nr_segs; seg++) {
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compat_uptr_t buf;
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compat_ssize_t len;
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if (__get_user(len, &uvector->iov_len) ||
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__get_user(buf, &uvector->iov_base)) {
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ret = -EFAULT;
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goto out;
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}
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if (len < 0) /* size_t not fitting in compat_ssize_t .. */
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goto out;
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if (type >= 0 &&
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!access_ok(compat_ptr(buf), len)) {
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ret = -EFAULT;
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goto out;
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}
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if (len > MAX_RW_COUNT - tot_len)
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len = MAX_RW_COUNT - tot_len;
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tot_len += len;
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iov->iov_base = compat_ptr(buf);
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iov->iov_len = (compat_size_t) len;
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uvector++;
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iov++;
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}
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ret = tot_len;
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out:
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return ret;
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}
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#endif
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static ssize_t do_iter_read(struct file *file, struct iov_iter *iter,
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loff_t *pos, rwf_t flags)
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{
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@ -1255,224 +1076,93 @@ SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec,
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return do_pwritev(fd, vec, vlen, pos, flags);
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}
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/*
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* Various compat syscalls. Note that they all pretend to take a native
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* iovec - import_iovec will properly treat those as compat_iovecs based on
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* in_compat_syscall().
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*/
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#ifdef CONFIG_COMPAT
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static size_t compat_readv(struct file *file,
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const struct compat_iovec __user *vec,
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unsigned long vlen, loff_t *pos, rwf_t flags)
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{
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struct iovec iovstack[UIO_FASTIOV];
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struct iovec *iov = iovstack;
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struct iov_iter iter;
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ssize_t ret;
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ret = compat_import_iovec(READ, vec, vlen, UIO_FASTIOV, &iov, &iter);
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if (ret >= 0) {
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ret = do_iter_read(file, &iter, pos, flags);
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kfree(iov);
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}
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if (ret > 0)
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add_rchar(current, ret);
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inc_syscr(current);
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return ret;
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}
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static size_t do_compat_readv(compat_ulong_t fd,
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const struct compat_iovec __user *vec,
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compat_ulong_t vlen, rwf_t flags)
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{
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struct fd f = fdget_pos(fd);
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||||
ssize_t ret;
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loff_t pos;
|
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|
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if (!f.file)
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return -EBADF;
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pos = f.file->f_pos;
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ret = compat_readv(f.file, vec, vlen, &pos, flags);
|
||||
if (ret >= 0)
|
||||
f.file->f_pos = pos;
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fdput_pos(f);
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return ret;
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|
||||
}
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||||
|
||||
COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd,
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const struct compat_iovec __user *,vec,
|
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compat_ulong_t, vlen)
|
||||
{
|
||||
return do_compat_readv(fd, vec, vlen, 0);
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||||
}
|
||||
|
||||
static long do_compat_preadv64(unsigned long fd,
|
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const struct compat_iovec __user *vec,
|
||||
unsigned long vlen, loff_t pos, rwf_t flags)
|
||||
{
|
||||
struct fd f;
|
||||
ssize_t ret;
|
||||
|
||||
if (pos < 0)
|
||||
return -EINVAL;
|
||||
f = fdget(fd);
|
||||
if (!f.file)
|
||||
return -EBADF;
|
||||
ret = -ESPIPE;
|
||||
if (f.file->f_mode & FMODE_PREAD)
|
||||
ret = compat_readv(f.file, vec, vlen, &pos, flags);
|
||||
fdput(f);
|
||||
return ret;
|
||||
}
|
||||
|
||||
#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
|
||||
COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
unsigned long, vlen, loff_t, pos)
|
||||
{
|
||||
return do_compat_preadv64(fd, vec, vlen, pos, 0);
|
||||
return do_preadv(fd, vec, vlen, pos, 0);
|
||||
}
|
||||
#endif
|
||||
|
||||
COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
compat_ulong_t, vlen, u32, pos_low, u32, pos_high)
|
||||
{
|
||||
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
|
||||
|
||||
return do_compat_preadv64(fd, vec, vlen, pos, 0);
|
||||
return do_preadv(fd, vec, vlen, pos, 0);
|
||||
}
|
||||
|
||||
#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
|
||||
COMPAT_SYSCALL_DEFINE5(preadv64v2, unsigned long, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
unsigned long, vlen, loff_t, pos, rwf_t, flags)
|
||||
{
|
||||
if (pos == -1)
|
||||
return do_compat_readv(fd, vec, vlen, flags);
|
||||
|
||||
return do_compat_preadv64(fd, vec, vlen, pos, flags);
|
||||
return do_readv(fd, vec, vlen, flags);
|
||||
return do_preadv(fd, vec, vlen, pos, flags);
|
||||
}
|
||||
#endif
|
||||
|
||||
COMPAT_SYSCALL_DEFINE6(preadv2, compat_ulong_t, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
compat_ulong_t, vlen, u32, pos_low, u32, pos_high,
|
||||
rwf_t, flags)
|
||||
{
|
||||
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
|
||||
|
||||
if (pos == -1)
|
||||
return do_compat_readv(fd, vec, vlen, flags);
|
||||
|
||||
return do_compat_preadv64(fd, vec, vlen, pos, flags);
|
||||
}
|
||||
|
||||
static size_t compat_writev(struct file *file,
|
||||
const struct compat_iovec __user *vec,
|
||||
unsigned long vlen, loff_t *pos, rwf_t flags)
|
||||
{
|
||||
struct iovec iovstack[UIO_FASTIOV];
|
||||
struct iovec *iov = iovstack;
|
||||
struct iov_iter iter;
|
||||
ssize_t ret;
|
||||
|
||||
ret = compat_import_iovec(WRITE, vec, vlen, UIO_FASTIOV, &iov, &iter);
|
||||
if (ret >= 0) {
|
||||
file_start_write(file);
|
||||
ret = do_iter_write(file, &iter, pos, flags);
|
||||
file_end_write(file);
|
||||
kfree(iov);
|
||||
}
|
||||
if (ret > 0)
|
||||
add_wchar(current, ret);
|
||||
inc_syscw(current);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static size_t do_compat_writev(compat_ulong_t fd,
|
||||
const struct compat_iovec __user* vec,
|
||||
compat_ulong_t vlen, rwf_t flags)
|
||||
{
|
||||
struct fd f = fdget_pos(fd);
|
||||
ssize_t ret;
|
||||
loff_t pos;
|
||||
|
||||
if (!f.file)
|
||||
return -EBADF;
|
||||
pos = f.file->f_pos;
|
||||
ret = compat_writev(f.file, vec, vlen, &pos, flags);
|
||||
if (ret >= 0)
|
||||
f.file->f_pos = pos;
|
||||
fdput_pos(f);
|
||||
return ret;
|
||||
}
|
||||
|
||||
COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd,
|
||||
const struct compat_iovec __user *, vec,
|
||||
compat_ulong_t, vlen)
|
||||
{
|
||||
return do_compat_writev(fd, vec, vlen, 0);
|
||||
}
|
||||
|
||||
static long do_compat_pwritev64(unsigned long fd,
|
||||
const struct compat_iovec __user *vec,
|
||||
unsigned long vlen, loff_t pos, rwf_t flags)
|
||||
{
|
||||
struct fd f;
|
||||
ssize_t ret;
|
||||
|
||||
if (pos < 0)
|
||||
return -EINVAL;
|
||||
f = fdget(fd);
|
||||
if (!f.file)
|
||||
return -EBADF;
|
||||
ret = -ESPIPE;
|
||||
if (f.file->f_mode & FMODE_PWRITE)
|
||||
ret = compat_writev(f.file, vec, vlen, &pos, flags);
|
||||
fdput(f);
|
||||
return ret;
|
||||
return do_readv(fd, vec, vlen, flags);
|
||||
return do_preadv(fd, vec, vlen, pos, flags);
|
||||
}
|
||||
|
||||
#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
|
||||
COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
unsigned long, vlen, loff_t, pos)
|
||||
{
|
||||
return do_compat_pwritev64(fd, vec, vlen, pos, 0);
|
||||
return do_pwritev(fd, vec, vlen, pos, 0);
|
||||
}
|
||||
#endif
|
||||
|
||||
COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *,vec,
|
||||
compat_ulong_t, vlen, u32, pos_low, u32, pos_high)
|
||||
{
|
||||
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
|
||||
|
||||
return do_compat_pwritev64(fd, vec, vlen, pos, 0);
|
||||
return do_pwritev(fd, vec, vlen, pos, 0);
|
||||
}
|
||||
|
||||
#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
|
||||
COMPAT_SYSCALL_DEFINE5(pwritev64v2, unsigned long, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
unsigned long, vlen, loff_t, pos, rwf_t, flags)
|
||||
{
|
||||
if (pos == -1)
|
||||
return do_compat_writev(fd, vec, vlen, flags);
|
||||
|
||||
return do_compat_pwritev64(fd, vec, vlen, pos, flags);
|
||||
return do_writev(fd, vec, vlen, flags);
|
||||
return do_pwritev(fd, vec, vlen, pos, flags);
|
||||
}
|
||||
#endif
|
||||
|
||||
COMPAT_SYSCALL_DEFINE6(pwritev2, compat_ulong_t, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *,vec,
|
||||
compat_ulong_t, vlen, u32, pos_low, u32, pos_high, rwf_t, flags)
|
||||
{
|
||||
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
|
||||
|
||||
if (pos == -1)
|
||||
return do_compat_writev(fd, vec, vlen, flags);
|
||||
|
||||
return do_compat_pwritev64(fd, vec, vlen, pos, flags);
|
||||
return do_writev(fd, vec, vlen, flags);
|
||||
return do_pwritev(fd, vec, vlen, pos, flags);
|
||||
}
|
||||
|
||||
#endif
|
||||
#endif /* CONFIG_COMPAT */
|
||||
|
||||
static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
|
||||
size_t count, loff_t max)
|
||||
|
|
|
|||
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Add table
Add a link
Reference in a new issue