mirror of https://gitee.com/openkylin/linux.git
Merge branch 'work.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull compat updates from Al Viro: "Some biarch patches - getting rid of assorted (mis)uses of compat_alloc_user_space(). Not much in that area this cycle..." * 'work.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: orangefs: simplify compat ioctl handling signalfd: lift sigmask copyin and size checks to callers of do_signalfd4() vmsplice(): lift importing iovec into vmsplice(2) and compat counterpart
This commit is contained in:
Linus Torvalds
commit
29d6849d88
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@ -719,37 +719,6 @@ struct ORANGEFS_dev_map_desc32 {
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__s32 count;
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};
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static unsigned long translate_dev_map26(unsigned long args, long *error)
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{
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struct ORANGEFS_dev_map_desc32 __user *p32 = (void __user *)args;
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/*
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* Depending on the architecture, allocate some space on the
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* user-call-stack based on our expected layout.
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*/
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struct ORANGEFS_dev_map_desc __user *p =
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compat_alloc_user_space(sizeof(*p));
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compat_uptr_t addr;
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*error = 0;
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/* get the ptr from the 32 bit user-space */
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if (get_user(addr, &p32->ptr))
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goto err;
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/* try to put that into a 64-bit layout */
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if (put_user(compat_ptr(addr), &p->ptr))
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goto err;
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/* copy the remaining fields */
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if (copy_in_user(&p->total_size, &p32->total_size, sizeof(__s32)))
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goto err;
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if (copy_in_user(&p->size, &p32->size, sizeof(__s32)))
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goto err;
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if (copy_in_user(&p->count, &p32->count, sizeof(__s32)))
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goto err;
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return (unsigned long)p;
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err:
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*error = -EFAULT;
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return 0;
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}
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/*
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* 32 bit user-space apps' ioctl handlers when kernel modules
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* is compiled as a 64 bit one
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@ -758,25 +727,26 @@ static long orangefs_devreq_compat_ioctl(struct file *filp, unsigned int cmd,
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unsigned long args)
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{
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long ret;
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unsigned long arg = args;
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/* Check for properly constructed commands */
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ret = check_ioctl_command(cmd);
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if (ret < 0)
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return ret;
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if (cmd == ORANGEFS_DEV_MAP) {
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/*
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* convert the arguments to what we expect internally
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* in kernel space
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*/
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arg = translate_dev_map26(args, &ret);
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if (ret < 0) {
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gossip_err("Could not translate dev map\n");
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return ret;
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}
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struct ORANGEFS_dev_map_desc desc;
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struct ORANGEFS_dev_map_desc32 d32;
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if (copy_from_user(&d32, (void __user *)args, sizeof(d32)))
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return -EFAULT;
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desc.ptr = compat_ptr(d32.ptr);
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desc.total_size = d32.total_size;
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desc.size = d32.size;
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desc.count = d32.count;
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return orangefs_bufmap_initialize(&desc);
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}
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/* no other ioctl requires translation */
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return dispatch_ioctl_command(cmd, arg);
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return dispatch_ioctl_command(cmd, args);
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}
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#endif /* CONFIG_COMPAT is in .config */
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@ -259,10 +259,8 @@ static const struct file_operations signalfd_fops = {
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.llseek = noop_llseek,
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};
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static int do_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask,
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int flags)
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static int do_signalfd4(int ufd, sigset_t *mask, int flags)
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{
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sigset_t sigmask;
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struct signalfd_ctx *ctx;
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/* Check the SFD_* constants for consistency. */
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@ -272,18 +270,15 @@ static int do_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask,
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if (flags & ~(SFD_CLOEXEC | SFD_NONBLOCK))
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return -EINVAL;
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if (sizemask != sizeof(sigset_t) ||
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copy_from_user(&sigmask, user_mask, sizeof(sigmask)))
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return -EINVAL;
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sigdelsetmask(&sigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
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signotset(&sigmask);
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sigdelsetmask(mask, sigmask(SIGKILL) | sigmask(SIGSTOP));
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signotset(mask);
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if (ufd == -1) {
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ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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ctx->sigmask = sigmask;
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ctx->sigmask = *mask;
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/*
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* When we call this, the initialization must be complete, since
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@ -303,7 +298,7 @@ static int do_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask,
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return -EINVAL;
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}
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spin_lock_irq(¤t->sighand->siglock);
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ctx->sigmask = sigmask;
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ctx->sigmask = *mask;
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spin_unlock_irq(¤t->sighand->siglock);
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wake_up(¤t->sighand->signalfd_wqh);
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@ -316,46 +311,51 @@ static int do_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask,
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SYSCALL_DEFINE4(signalfd4, int, ufd, sigset_t __user *, user_mask,
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size_t, sizemask, int, flags)
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{
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return do_signalfd4(ufd, user_mask, sizemask, flags);
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sigset_t mask;
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if (sizemask != sizeof(sigset_t) ||
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copy_from_user(&mask, user_mask, sizeof(mask)))
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return -EINVAL;
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return do_signalfd4(ufd, &mask, flags);
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}
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SYSCALL_DEFINE3(signalfd, int, ufd, sigset_t __user *, user_mask,
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size_t, sizemask)
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{
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return do_signalfd4(ufd, user_mask, sizemask, 0);
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sigset_t mask;
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if (sizemask != sizeof(sigset_t) ||
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copy_from_user(&mask, user_mask, sizeof(mask)))
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return -EINVAL;
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return do_signalfd4(ufd, &mask, 0);
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}
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#ifdef CONFIG_COMPAT
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static long do_compat_signalfd4(int ufd,
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const compat_sigset_t __user *sigmask,
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const compat_sigset_t __user *user_mask,
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compat_size_t sigsetsize, int flags)
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{
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sigset_t tmp;
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sigset_t __user *ksigmask;
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sigset_t mask;
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if (sigsetsize != sizeof(compat_sigset_t))
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return -EINVAL;
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if (get_compat_sigset(&tmp, sigmask))
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if (get_compat_sigset(&mask, user_mask))
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return -EFAULT;
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ksigmask = compat_alloc_user_space(sizeof(sigset_t));
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if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
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return -EFAULT;
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return do_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
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return do_signalfd4(ufd, &mask, flags);
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}
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COMPAT_SYSCALL_DEFINE4(signalfd4, int, ufd,
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const compat_sigset_t __user *, sigmask,
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const compat_sigset_t __user *, user_mask,
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compat_size_t, sigsetsize,
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int, flags)
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{
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return do_compat_signalfd4(ufd, sigmask, sigsetsize, flags);
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return do_compat_signalfd4(ufd, user_mask, sigsetsize, flags);
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}
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COMPAT_SYSCALL_DEFINE3(signalfd, int, ufd,
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const compat_sigset_t __user *,sigmask,
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const compat_sigset_t __user *, user_mask,
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compat_size_t, sigsetsize)
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{
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return do_compat_signalfd4(ufd, sigmask, sigsetsize, 0);
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return do_compat_signalfd4(ufd, user_mask, sigsetsize, 0);
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}
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#endif
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144
fs/splice.c
144
fs/splice.c
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@ -1243,38 +1243,26 @@ static int pipe_to_user(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
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* For lack of a better implementation, implement vmsplice() to userspace
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* as a simple copy of the pipes pages to the user iov.
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*/
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static long vmsplice_to_user(struct file *file, const struct iovec __user *uiov,
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unsigned long nr_segs, unsigned int flags)
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static long vmsplice_to_user(struct file *file, struct iov_iter *iter,
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unsigned int flags)
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{
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struct pipe_inode_info *pipe;
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struct splice_desc sd;
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long ret;
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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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struct pipe_inode_info *pipe = get_pipe_info(file);
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struct splice_desc sd = {
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.total_len = iov_iter_count(iter),
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.flags = flags,
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.u.data = iter
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};
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long ret = 0;
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pipe = get_pipe_info(file);
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if (!pipe)
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return -EBADF;
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ret = import_iovec(READ, uiov, nr_segs,
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ARRAY_SIZE(iovstack), &iov, &iter);
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if (ret < 0)
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return ret;
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sd.total_len = iov_iter_count(&iter);
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sd.len = 0;
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sd.flags = flags;
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sd.u.data = &iter;
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sd.pos = 0;
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if (sd.total_len) {
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pipe_lock(pipe);
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ret = __splice_from_pipe(pipe, &sd, pipe_to_user);
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pipe_unlock(pipe);
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}
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kfree(iov);
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return ret;
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}
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@ -1283,14 +1271,11 @@ static long vmsplice_to_user(struct file *file, const struct iovec __user *uiov,
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* as splice-from-memory, where the regular splice is splice-from-file (or
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* to file). In both cases the output is a pipe, naturally.
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*/
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static long vmsplice_to_pipe(struct file *file, const struct iovec __user *uiov,
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unsigned long nr_segs, unsigned int flags)
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static long vmsplice_to_pipe(struct file *file, struct iov_iter *iter,
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unsigned int flags)
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{
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struct pipe_inode_info *pipe;
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struct iovec iovstack[UIO_FASTIOV];
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struct iovec *iov = iovstack;
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struct iov_iter from;
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long ret;
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long ret = 0;
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unsigned buf_flag = 0;
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if (flags & SPLICE_F_GIFT)
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@ -1300,22 +1285,31 @@ static long vmsplice_to_pipe(struct file *file, const struct iovec __user *uiov,
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if (!pipe)
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return -EBADF;
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ret = import_iovec(WRITE, uiov, nr_segs,
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ARRAY_SIZE(iovstack), &iov, &from);
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if (ret < 0)
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return ret;
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pipe_lock(pipe);
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ret = wait_for_space(pipe, flags);
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if (!ret)
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ret = iter_to_pipe(&from, pipe, buf_flag);
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ret = iter_to_pipe(iter, pipe, buf_flag);
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pipe_unlock(pipe);
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if (ret > 0)
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wakeup_pipe_readers(pipe);
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kfree(iov);
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return ret;
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}
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static int vmsplice_type(struct fd f, int *type)
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{
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if (!f.file)
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return -EBADF;
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if (f.file->f_mode & FMODE_WRITE) {
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*type = WRITE;
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} else if (f.file->f_mode & FMODE_READ) {
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*type = READ;
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} else {
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fdput(f);
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return -EBADF;
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}
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return 0;
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}
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/*
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* Note that vmsplice only really supports true splicing _from_ user memory
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* to a pipe, not the other way around. Splicing from user memory is a simple
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@ -1332,57 +1326,69 @@ static long vmsplice_to_pipe(struct file *file, const struct iovec __user *uiov,
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* Currently we punt and implement it as a normal copy, see pipe_to_user().
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*
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*/
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static long do_vmsplice(int fd, const struct iovec __user *iov,
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unsigned long nr_segs, unsigned int flags)
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static long do_vmsplice(struct file *f, struct iov_iter *iter, unsigned int flags)
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{
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struct fd f;
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long error;
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if (unlikely(flags & ~SPLICE_F_ALL))
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return -EINVAL;
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if (unlikely(nr_segs > UIO_MAXIOV))
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return -EINVAL;
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else if (unlikely(!nr_segs))
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if (!iov_iter_count(iter))
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return 0;
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error = -EBADF;
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f = fdget(fd);
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if (f.file) {
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if (f.file->f_mode & FMODE_WRITE)
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error = vmsplice_to_pipe(f.file, iov, nr_segs, flags);
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else if (f.file->f_mode & FMODE_READ)
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error = vmsplice_to_user(f.file, iov, nr_segs, flags);
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fdput(f);
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}
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return error;
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if (iov_iter_rw(iter) == WRITE)
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return vmsplice_to_pipe(f, iter, flags);
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else
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return vmsplice_to_user(f, iter, flags);
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}
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SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov,
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SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov,
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unsigned long, nr_segs, unsigned int, flags)
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{
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return do_vmsplice(fd, iov, nr_segs, flags);
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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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long error;
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struct fd f;
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int type;
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f = fdget(fd);
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error = vmsplice_type(f, &type);
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if (error)
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return error;
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error = import_iovec(type, uiov, nr_segs,
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ARRAY_SIZE(iovstack), &iov, &iter);
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if (!error) {
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error = do_vmsplice(f.file, &iter, flags);
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kfree(iov);
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}
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fdput(f);
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return error;
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}
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#ifdef CONFIG_COMPAT
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COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, iov32,
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unsigned int, nr_segs, unsigned int, flags)
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{
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unsigned i;
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struct iovec __user *iov;
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if (nr_segs > UIO_MAXIOV)
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return -EINVAL;
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iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
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for (i = 0; i < nr_segs; i++) {
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struct compat_iovec v;
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if (get_user(v.iov_base, &iov32[i].iov_base) ||
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get_user(v.iov_len, &iov32[i].iov_len) ||
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put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
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put_user(v.iov_len, &iov[i].iov_len))
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return -EFAULT;
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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;
|
||||
long error;
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||||
struct fd f;
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int type;
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f = fdget(fd);
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error = vmsplice_type(f, &type);
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if (error)
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return error;
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error = compat_import_iovec(type, iov32, nr_segs,
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ARRAY_SIZE(iovstack), &iov, &iter);
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if (!error) {
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error = do_vmsplice(f.file, &iter, flags);
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kfree(iov);
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}
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return do_vmsplice(fd, iov, nr_segs, flags);
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fdput(f);
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||||
return error;
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||||
}
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#endif
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||||
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||||
|
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|
|||
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