// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (C) 2017 Red Hat, Inc. */ #include "fuse_i.h" #include <linux/uio.h>#include <linux/compat.h>#include <linux/fileattr.h>#include <linux/fsverity.h> #include <linux/slab.h>#define FUSE_VERITY_ENABLE_ARG_MAX_PAGES 256 static ssize_t fuse_send_ioctl(struct fuse_mount *fm, struct fuse_args *args, struct fuse_ioctl_out *outarg){ ssize_t ret; args->out_args[0].size = sizeof(*outarg); args->out_args[0].value = outarg; ret = fuse_simple_request(fm, args); /* Translate ENOSYS, which shouldn't be returned from fs */ if (ret == -ENOSYS) ret = -ENOTTY; if (ret >= 0 && outarg->result == -ENOSYS) outarg->result = -ENOTTY; return ret;} /* * CUSE servers compiled on 32bit broke on 64bit kernels because the * ABI was defined to be 'struct iovec' which is different on 32bit * and 64bit. Fortunately we can determine which structure the server * used from the size of the reply. */static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src, size_t transferred, unsigned count, bool is_compat){#ifdef CONFIG_COMPAT if (count * sizeof(struct compat_iovec) == transferred) { struct compat_iovec *ciov = src; unsigned i; /* * With this interface a 32bit server cannot support * non-compat (i.e. ones coming from 64bit apps) ioctl * requests */ if (!is_compat) return -EINVAL; for (i = 0; i < count; i++) { dst[i].iov_base = compat_ptr(ciov[i].iov_base); dst[i].iov_len = ciov[i].iov_len; } return 0; }#endif if (count * sizeof(struct iovec) != transferred) return -EIO; memcpy(dst, src, transferred); return 0;} /* Make sure iov_length() won't overflow */static int fuse_verify_ioctl_iov(struct fuse_conn *fc, struct iovec *iov, size_t count){ size_t n; u32 max = fc->max_pages << PAGE_SHIFT; for (n = 0; n < count; n++, iov++) { if (iov->iov_len > (size_t) max) return -ENOMEM; max -= iov->iov_len; } return 0;} static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst, void *src, size_t transferred, unsigned count, bool is_compat){ unsigned i; struct fuse_ioctl_iovec *fiov = src; if (fc->minor < 16) { return fuse_copy_ioctl_iovec_old(dst, src, transferred, count, is_compat); } if (count * sizeof(struct fuse_ioctl_iovec) != transferred) return -EIO; for (i = 0; i < count; i++) { /* Did the server supply an inappropriate value? */ if (fiov[i].base != (unsigned long) fiov[i].base || fiov[i].len != (unsigned long) fiov[i].len) return -EIO; dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base; dst[i].iov_len = (size_t) fiov[i].len; #ifdef CONFIG_COMPAT if (is_compat && (ptr_to_compat(dst[i].iov_base) != fiov[i].base || (compat_size_t) dst[i].iov_len != fiov[i].len)) return -EIO;#endif } return 0;} /* For fs-verity, determine iov lengths from input */static int fuse_setup_measure_verity(unsigned long arg, struct iovec *iov){ __u16 digest_size; struct fsverity_digest __user *uarg = (void __user *)arg; if (copy_from_user(&digest_size, &uarg->digest_size, sizeof(digest_size))) return -EFAULT; if (digest_size > SIZE_MAX - sizeof(struct fsverity_digest)) return -EINVAL; iov->iov_len = sizeof(struct fsverity_digest) + digest_size; return 0;} static int fuse_setup_enable_verity(unsigned long arg, struct iovec *iov, unsigned int *in_iovs){ struct fsverity_enable_arg enable; struct fsverity_enable_arg __user *uarg = (void __user *)arg; const __u32 max_buffer_len = FUSE_VERITY_ENABLE_ARG_MAX_PAGES * PAGE_SIZE; if (copy_from_user(&enable, uarg, sizeof(enable))) return -EFAULT; if (enable.salt_size > max_buffer_len || enable.sig_size > max_buffer_len) return -ENOMEM; if (enable.salt_size > 0) { iov++; (*in_iovs)++; iov->iov_base = u64_to_user_ptr(enable.salt_ptr); iov->iov_len = enable.salt_size; } if (enable.sig_size > 0) { iov++; (*in_iovs)++; iov->iov_base = u64_to_user_ptr(enable.sig_ptr); iov->iov_len = enable.sig_size; } return 0;} /* * For ioctls, there is no generic way to determine how much memory * needs to be read and/or written. Furthermore, ioctls are allowed * to dereference the passed pointer, so the parameter requires deep * copying but FUSE has no idea whatsoever about what to copy in or * out. * * This is solved by allowing FUSE server to retry ioctl with * necessary in/out iovecs. Let's assume the ioctl implementation * needs to read in the following structure. * * struct a { * char *buf; * size_t buflen; * } * * On the first callout to FUSE server, inarg->in_size and * inarg->out_size will be NULL; then, the server completes the ioctl * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and * the actual iov array to * * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } } * * which tells FUSE to copy in the requested area and retry the ioctl. * On the second round, the server has access to the structure and * from that it can tell what to look for next, so on the invocation, * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to * * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) }, * { .iov_base = a.buf, .iov_len = a.buflen } } * * FUSE will copy both struct a and the pointed buffer from the * process doing the ioctl and retry ioctl with both struct a and the * buffer. * * This time, FUSE server has everything it needs and completes ioctl * without FUSE_IOCTL_RETRY which finishes the ioctl call. * * Copying data out works the same way. * * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel * automatically initializes in and out iovs by decoding @cmd with * _IOC_* macros and the server is not allowed to request RETRY. This * limits ioctl data transfers to well-formed ioctls and is the forced * behavior for all FUSE servers. */long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, unsigned int flags){ struct fuse_file *ff = file->private_data; struct fuse_mount *fm = ff->fm; struct fuse_ioctl_in inarg = { .fh = ff->fh, .cmd = cmd, .arg = arg, .flags = flags }; struct fuse_ioctl_out outarg; struct iovec *iov_page = NULL; struct iovec *in_iov = NULL, *out_iov = NULL; unsigned int in_iovs = 0, out_iovs = 0, max_pages; size_t in_size, out_size, c; ssize_t transferred; int err, i; struct iov_iter ii; struct fuse_args_pages ap = {}; #if BITS_PER_LONG == 32 inarg.flags |= FUSE_IOCTL_32BIT;#else if (flags & FUSE_IOCTL_COMPAT) { inarg.flags |= FUSE_IOCTL_32BIT;#ifdef CONFIG_X86_X32_ABI if (in_x32_syscall()) inarg.flags |= FUSE_IOCTL_COMPAT_X32;#endif }#endif /* assume all the iovs returned by client always fits in a page */ BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE); err = -ENOMEM; ap.folios = fuse_folios_alloc(fm->fc->max_pages, GFP_KERNEL, &ap.descs); iov_page = kmalloc(PAGE_SIZE, GFP_KERNEL); if (!ap.folios || !iov_page) goto out; fuse_folio_descs_length_init(ap.descs, 0, fm->fc->max_pages); /* * If restricted, initialize IO parameters as encoded in @cmd. * RETRY from server is not allowed. */ if (!(flags & FUSE_IOCTL_UNRESTRICTED)) { struct iovec *iov = iov_page; iov->iov_base = (void __user *)arg; iov->iov_len = _IOC_SIZE(cmd); if (_IOC_DIR(cmd) & _IOC_WRITE) { in_iov = iov; in_iovs = 1; } if (_IOC_DIR(cmd) & _IOC_READ) { out_iov = iov; out_iovs = 1; } err = 0; switch (cmd) { case FS_IOC_MEASURE_VERITY: err = fuse_setup_measure_verity(arg, iov); break; case FS_IOC_ENABLE_VERITY: err = fuse_setup_enable_verity(arg, iov, &in_iovs); break; } if (err) goto out; } retry: inarg.in_size = in_size = iov_length(in_iov, in_iovs); inarg.out_size = out_size = iov_length(out_iov, out_iovs); /* * Out data can be used either for actual out data or iovs, * make sure there always is at least one page. */ out_size = max_t(size_t, out_size, PAGE_SIZE); max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE); /* make sure there are enough buffer pages and init request with them */ err = -ENOMEM; if (max_pages > fm->fc->max_pages) goto out; while (ap.num_folios < max_pages) { ap.folios[ap.num_folios] = folio_alloc(GFP_KERNEL | __GFP_HIGHMEM, 0); if (!ap.folios[ap.num_folios]) goto out; ap.num_folios++; } /* okay, let's send it to the client */ ap.args.opcode = FUSE_IOCTL; ap.args.nodeid = ff->nodeid; ap.args.in_numargs = 1; ap.args.in_args[0].size = sizeof(inarg); ap.args.in_args[0].value = &inarg; if (in_size) { ap.args.in_numargs++; ap.args.in_args[1].size = in_size; ap.args.in_pages = true; err = -EFAULT; iov_iter_init(&ii, ITER_SOURCE, in_iov, in_iovs, in_size); for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_folios); i++) { c = copy_folio_from_iter(ap.folios[i], 0, PAGE_SIZE, &ii); if (c != PAGE_SIZE && iov_iter_count(&ii)) goto out; } } ap.args.out_numargs = 2; ap.args.out_args[1].size = out_size; ap.args.out_pages = true; ap.args.out_argvar = true; transferred = fuse_send_ioctl(fm, &ap.args, &outarg); err = transferred; if (transferred < 0) goto out; /* did it ask for retry? */ if (outarg.flags & FUSE_IOCTL_RETRY) { void *vaddr; /* no retry if in restricted mode */ err = -EIO; if (!(flags & FUSE_IOCTL_UNRESTRICTED)) goto out; in_iovs = outarg.in_iovs; out_iovs = outarg.out_iovs; /* * Make sure things are in boundary, separate checks * are to protect against overflow. */ err = -ENOMEM; if (in_iovs > FUSE_IOCTL_MAX_IOV || out_iovs > FUSE_IOCTL_MAX_IOV || in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV) goto out; vaddr = kmap_local_folio(ap.folios[0], 0); err = fuse_copy_ioctl_iovec(fm->fc, iov_page, vaddr, transferred, in_iovs + out_iovs, (flags & FUSE_IOCTL_COMPAT) != 0); kunmap_local(vaddr); if (err) goto out; in_iov = iov_page; out_iov = in_iov + in_iovs; err = fuse_verify_ioctl_iov(fm->fc, in_iov, in_iovs); if (err) goto out; err = fuse_verify_ioctl_iov(fm->fc, out_iov, out_iovs); if (err) goto out; goto retry; } err = -EIO; if (transferred > inarg.out_size) goto out; err = -EFAULT; iov_iter_init(&ii, ITER_DEST, out_iov, out_iovs, transferred); for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_folios); i++) { c = copy_folio_to_iter(ap.folios[i], 0, PAGE_SIZE, &ii); if (c != PAGE_SIZE && iov_iter_count(&ii)) goto out; } err = 0; out: kfree(iov_page); while (ap.num_folios) folio_put(ap.folios[--ap.num_folios]); kfree(ap.folios); return err ? err : outarg.result;}EXPORT_SYMBOL_GPL(fuse_do_ioctl); long fuse_ioctl_common(struct file *file, unsigned int cmd, unsigned long arg, unsigned int flags){ struct inode *inode = file_inode(file); struct fuse_conn *fc = get_fuse_conn(inode); if (!fuse_allow_current_process(fc)) return -EACCES; if (fuse_is_bad(inode)) return -EIO; return fuse_do_ioctl(file, cmd, arg, flags);} long fuse_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg){ return fuse_ioctl_common(file, cmd, arg, 0);} long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg){ return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT);} static int fuse_priv_ioctl(struct inode *inode, struct fuse_file *ff, unsigned int cmd, void *ptr, size_t size){ struct fuse_mount *fm = ff->fm; struct fuse_ioctl_in inarg; struct fuse_ioctl_out outarg; FUSE_ARGS(args); int err; memset(&inarg, 0, sizeof(inarg)); inarg.fh = ff->fh; inarg.cmd = cmd; #if BITS_PER_LONG == 32 inarg.flags |= FUSE_IOCTL_32BIT;#endif if (S_ISDIR(inode->i_mode)) inarg.flags |= FUSE_IOCTL_DIR; if (_IOC_DIR(cmd) & _IOC_READ) inarg.out_size = size; if (_IOC_DIR(cmd) & _IOC_WRITE) inarg.in_size = size; args.opcode = FUSE_IOCTL; args.nodeid = ff->nodeid; args.in_numargs = 2; args.in_args[0].size = sizeof(inarg); args.in_args[0].value = &inarg; args.in_args[1].size = inarg.in_size; args.in_args[1].value = ptr; args.out_numargs = 2; args.out_args[1].size = inarg.out_size; args.out_args[1].value = ptr; err = fuse_send_ioctl(fm, &args, &outarg); if (!err) { if (outarg.result < 0) err = outarg.result; else if (outarg.flags & FUSE_IOCTL_RETRY) err = -EIO; } return err;} static struct fuse_file *fuse_priv_ioctl_prepare(struct inode *inode){ struct fuse_mount *fm = get_fuse_mount(inode); bool isdir = S_ISDIR(inode->i_mode); if (!fuse_allow_current_process(fm->fc)) return ERR_PTR(-EACCES); if (fuse_is_bad(inode)) return ERR_PTR(-EIO); if (!S_ISREG(inode->i_mode) && !isdir) return ERR_PTR(-ENOTTY); return fuse_file_open(fm, get_node_id(inode), O_RDONLY, isdir);} Lines 1–500 of 577. 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// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2017 Red Hat, Inc. */ #include "fuse_i.h" #include <linux/uio.h> #include <linux/compat.h> #include <linux/fileattr.h> #include <linux/fsverity.h> #include <linux/slab.h> #define FUSE_VERITY_ENABLE_ARG_MAX_PAGES 256 static ssize_t fuse_send_ioctl(struct fuse_mount *fm, struct fuse_args *args, struct fuse_ioctl_out *outarg) { ssize_t ret; args->out_args[0].size = sizeof(*outarg); args->out_args[0].value = outarg; ret = fuse_simple_request(fm, args); /* Translate ENOSYS, which shouldn't be returned from fs */ if (ret == -ENOSYS) ret = -ENOTTY; if (ret >= 0 && outarg->result == -ENOSYS) outarg->result = -ENOTTY; return ret; } /* * CUSE servers compiled on 32bit broke on 64bit kernels because the * ABI was defined to be 'struct iovec' which is different on 32bit * and 64bit. Fortunately we can determine which structure the server * used from the size of the reply. */ static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src, size_t transferred, unsigned count, bool is_compat) { #ifdef CONFIG_COMPAT if (count * sizeof(struct compat_iovec) == transferred) { struct compat_iovec *ciov = src; unsigned i; /* * With this interface a 32bit server cannot support * non-compat (i.e. ones coming from 64bit apps) ioctl * requests */ if (!is_compat) return -EINVAL; for (i = 0; i < count; i++) { dst[i].iov_base = compat_ptr(ciov[i].iov_base); dst[i].iov_len = ciov[i].iov_len; } return 0; } #endif if (count * sizeof(struct iovec) != transferred) return -EIO; memcpy(dst, src, transferred); return 0; } /* Make sure iov_length() won't overflow */ static int fuse_verify_ioctl_iov(struct fuse_conn *fc, struct iovec *iov, size_t count) { size_t n; u32 max = fc->max_pages << PAGE_SHIFT; for (n = 0; n < count; n++, iov++) { if (iov->iov_len > (size_t) max) return -ENOMEM; max -= iov->iov_len; } return 0; } static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst, void *src, size_t transferred, unsigned count, bool is_compat) { unsigned i; struct fuse_ioctl_iovec *fiov = src; if (fc->minor < 16) { return fuse_copy_ioctl_iovec_old(dst, src, transferred, count, is_compat); } if (count * sizeof(struct fuse_ioctl_iovec) != transferred) return -EIO; for (i = 0; i < count; i++) { /* Did the server supply an inappropriate value? */ if (fiov[i].base != (unsigned long) fiov[i].base || fiov[i].len != (unsigned long) fiov[i].len) return -EIO; dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base; dst[i].iov_len = (size_t) fiov[i].len; #ifdef CONFIG_COMPAT if (is_compat && (ptr_to_compat(dst[i].iov_base) != fiov[i].base || (compat_size_t) dst[i].iov_len != fiov[i].len)) return -EIO; #endif } return 0; } /* For fs-verity, determine iov lengths from input */ static int fuse_setup_measure_verity(unsigned long arg, struct iovec *iov) { __u16 digest_size; struct fsverity_digest __user *uarg = (void __user *)arg; if (copy_from_user(&digest_size, &uarg->digest_size, sizeof(digest_size))) return -EFAULT; if (digest_size > SIZE_MAX - sizeof(struct fsverity_digest)) return -EINVAL; iov->iov_len = sizeof(struct fsverity_digest) + digest_size; return 0; } static int fuse_setup_enable_verity(unsigned long arg, struct iovec *iov, unsigned int *in_iovs) { struct fsverity_enable_arg enable; struct fsverity_enable_arg __user *uarg = (void __user *)arg; const __u32 max_buffer_len = FUSE_VERITY_ENABLE_ARG_MAX_PAGES * PAGE_SIZE; if (copy_from_user(&enable, uarg, sizeof(enable))) return -EFAULT; if (enable.salt_size > max_buffer_len || enable.sig_size > max_buffer_len) return -ENOMEM; if (enable.salt_size > 0) { iov++; (*in_iovs)++; iov->iov_base = u64_to_user_ptr(enable.salt_ptr); iov->iov_len = enable.salt_size; } if (enable.sig_size > 0) { iov++; (*in_iovs)++; iov->iov_base = u64_to_user_ptr(enable.sig_ptr); iov->iov_len = enable.sig_size; } return 0; } /* * For ioctls, there is no generic way to determine how much memory * needs to be read and/or written. Furthermore, ioctls are allowed * to dereference the passed pointer, so the parameter requires deep * copying but FUSE has no idea whatsoever about what to copy in or * out. * * This is solved by allowing FUSE server to retry ioctl with * necessary in/out iovecs. Let's assume the ioctl implementation * needs to read in the following structure. * * struct a { * char *buf; * size_t buflen; * } * * On the first callout to FUSE server, inarg->in_size and * inarg->out_size will be NULL; then, the server completes the ioctl * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and * the actual iov array to * * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } } * * which tells FUSE to copy in the requested area and retry the ioctl. * On the second round, the server has access to the structure and * from that it can tell what to look for next, so on the invocation, * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to * * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) }, * { .iov_base = a.buf, .iov_len = a.buflen } } * * FUSE will copy both struct a and the pointed buffer from the * process doing the ioctl and retry ioctl with both struct a and the * buffer. * * This time, FUSE server has everything it needs and completes ioctl * without FUSE_IOCTL_RETRY which finishes the ioctl call. * * Copying data out works the same way. * * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel * automatically initializes in and out iovs by decoding @cmd with * _IOC_* macros and the server is not allowed to request RETRY. This * limits ioctl data transfers to well-formed ioctls and is the forced * behavior for all FUSE servers. */ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, unsigned int flags) { struct fuse_file *ff = file->private_data; struct fuse_mount *fm = ff->fm; struct fuse_ioctl_in inarg = { .fh = ff->fh, .cmd = cmd, .arg = arg, .flags = flags }; struct fuse_ioctl_out outarg; struct iovec *iov_page = NULL; struct iovec *in_iov = NULL, *out_iov = NULL; unsigned int in_iovs = 0, out_iovs = 0, max_pages; size_t in_size, out_size, c; ssize_t transferred; int err, i; struct iov_iter ii; struct fuse_args_pages ap = {}; #if BITS_PER_LONG == 32 inarg.flags |= FUSE_IOCTL_32BIT; #else if (flags & FUSE_IOCTL_COMPAT) { inarg.flags |= FUSE_IOCTL_32BIT; #ifdef CONFIG_X86_X32_ABI if (in_x32_syscall()) inarg.flags |= FUSE_IOCTL_COMPAT_X32; #endif } #endif /* assume all the iovs returned by client always fits in a page */ BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE); err = -ENOMEM; ap.folios = fuse_folios_alloc(fm->fc->max_pages, GFP_KERNEL, &ap.descs); iov_page = kmalloc(PAGE_SIZE, GFP_KERNEL); if (!ap.folios || !iov_page) goto out; fuse_folio_descs_length_init(ap.descs, 0, fm->fc->max_pages); /* * If restricted, initialize IO parameters as encoded in @cmd. * RETRY from server is not allowed. */ if (!(flags & FUSE_IOCTL_UNRESTRICTED)) { struct iovec *iov = iov_page; iov->iov_base = (void __user *)arg; iov->iov_len = _IOC_SIZE(cmd); if (_IOC_DIR(cmd) & _IOC_WRITE) { in_iov = iov; in_iovs = 1; } if (_IOC_DIR(cmd) & _IOC_READ) { out_iov = iov; out_iovs = 1; } err = 0; switch (cmd) { case FS_IOC_MEASURE_VERITY: err = fuse_setup_measure_verity(arg, iov); break; case FS_IOC_ENABLE_VERITY: err = fuse_setup_enable_verity(arg, iov, &in_iovs); break; } if (err) goto out; } retry: inarg.in_size = in_size = iov_length(in_iov, in_iovs); inarg.out_size = out_size = iov_length(out_iov, out_iovs); /* * Out data can be used either for actual out data or iovs, * make sure there always is at least one page. */ out_size = max_t(size_t, out_size, PAGE_SIZE); max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE); /* make sure there are enough buffer pages and init request with them */ err = -ENOMEM; if (max_pages > fm->fc->max_pages) goto out; while (ap.num_folios < max_pages) { ap.folios[ap.num_folios] = folio_alloc(GFP_KERNEL | __GFP_HIGHMEM, 0); if (!ap.folios[ap.num_folios]) goto out; ap.num_folios++; } /* okay, let's send it to the client */ ap.args.opcode = FUSE_IOCTL; ap.args.nodeid = ff->nodeid; ap.args.in_numargs = 1; ap.args.in_args[0].size = sizeof(inarg); ap.args.in_args[0].value = &inarg; if (in_size) { ap.args.in_numargs++; ap.args.in_args[1].size = in_size; ap.args.in_pages = true; err = -EFAULT; iov_iter_init(&ii, ITER_SOURCE, in_iov, in_iovs, in_size); for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_folios); i++) { c = copy_folio_from_iter(ap.folios[i], 0, PAGE_SIZE, &ii); if (c != PAGE_SIZE && iov_iter_count(&ii)) goto out; } } ap.args.out_numargs = 2; ap.args.out_args[1].size = out_size; ap.args.out_pages = true; ap.args.out_argvar = true; transferred = fuse_send_ioctl(fm, &ap.args, &outarg); err = transferred; if (transferred < 0) goto out; /* did it ask for retry? */ if (outarg.flags & FUSE_IOCTL_RETRY) { void *vaddr; /* no retry if in restricted mode */ err = -EIO; if (!(flags & FUSE_IOCTL_UNRESTRICTED)) goto out; in_iovs = outarg.in_iovs; out_iovs = outarg.out_iovs; /* * Make sure things are in boundary, separate checks * are to protect against overflow. */ err = -ENOMEM; if (in_iovs > FUSE_IOCTL_MAX_IOV || out_iovs > FUSE_IOCTL_MAX_IOV || in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV) goto out; vaddr = kmap_local_folio(ap.folios[0], 0); err = fuse_copy_ioctl_iovec(fm->fc, iov_page, vaddr, transferred, in_iovs + out_iovs, (flags & FUSE_IOCTL_COMPAT) != 0); kunmap_local(vaddr); if (err) goto out; in_iov = iov_page; out_iov = in_iov + in_iovs; err = fuse_verify_ioctl_iov(fm->fc, in_iov, in_iovs); if (err) goto out; err = fuse_verify_ioctl_iov(fm->fc, out_iov, out_iovs); if (err) goto out; goto retry; } err = -EIO; if (transferred > inarg.out_size) goto out; err = -EFAULT; iov_iter_init(&ii, ITER_DEST, out_iov, out_iovs, transferred); for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_folios); i++) { c = copy_folio_to_iter(ap.folios[i], 0, PAGE_SIZE, &ii); if (c != PAGE_SIZE && iov_iter_count(&ii)) goto out; } err = 0; out: kfree(iov_page); while (ap.num_folios) folio_put(ap.folios[--ap.num_folios]); kfree(ap.folios); return err ? err : outarg.result; } EXPORT_SYMBOL_GPL(fuse_do_ioctl); long fuse_ioctl_common(struct file *file, unsigned int cmd, unsigned long arg, unsigned int flags) { struct inode *inode = file_inode(file); struct fuse_conn *fc = get_fuse_conn(inode); if (!fuse_allow_current_process(fc)) return -EACCES; if (fuse_is_bad(inode)) return -EIO; return fuse_do_ioctl(file, cmd, arg, flags); } long fuse_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { return fuse_ioctl_common(file, cmd, arg, 0); } long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT); } static int fuse_priv_ioctl(struct inode *inode, struct fuse_file *ff, unsigned int cmd, void *ptr, size_t size) { struct fuse_mount *fm = ff->fm; struct fuse_ioctl_in inarg; struct fuse_ioctl_out outarg; FUSE_ARGS(args); int err; memset(&inarg, 0, sizeof(inarg)); inarg.fh = ff->fh; inarg.cmd = cmd; #if BITS_PER_LONG == 32 inarg.flags |= FUSE_IOCTL_32BIT; #endif if (S_ISDIR(inode->i_mode)) inarg.flags |= FUSE_IOCTL_DIR; if (_IOC_DIR(cmd) & _IOC_READ) inarg.out_size = size; if (_IOC_DIR(cmd) & _IOC_WRITE) inarg.in_size = size; args.opcode = FUSE_IOCTL; args.nodeid = ff->nodeid; args.in_numargs = 2; args.in_args[0].size = sizeof(inarg); args.in_args[0].value = &inarg; args.in_args[1].size = inarg.in_size; args.in_args[1].value = ptr; args.out_numargs = 2; args.out_args[1].size = inarg.out_size; args.out_args[1].value = ptr; err = fuse_send_ioctl(fm, &args, &outarg); if (!err) { if (outarg.result < 0) err = outarg.result; else if (outarg.flags & FUSE_IOCTL_RETRY) err = -EIO; } return err; } static struct fuse_file *fuse_priv_ioctl_prepare(struct inode *inode) { struct fuse_mount *fm = get_fuse_mount(inode); bool isdir = S_ISDIR(inode->i_mode); if (!fuse_allow_current_process(fm->fc)) return ERR_PTR(-EACCES); if (fuse_is_bad(inode)) return ERR_PTR(-EIO); if (!S_ISREG(inode->i_mode) && !isdir) return ERR_PTR(-ENOTTY); return fuse_file_open(fm, get_node_id(inode), O_RDONLY, isdir); }