^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * fs/f2fs/verity.c: fs-verity support for f2fs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 2019 Google LLC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Implementation of fsverity_operations for f2fs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Like ext4, f2fs stores the verity metadata (Merkle tree and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * fsverity_descriptor) past the end of the file, starting at the first 64K
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * boundary beyond i_size. This approach works because (a) verity files are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * readonly, and (b) pages fully beyond i_size aren't visible to userspace but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * can be read/written internally by f2fs with only some relatively small
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * changes to f2fs. Extended attributes cannot be used because (a) f2fs limits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * the total size of an inode's xattr entries to 4096 bytes, which wouldn't be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * enough for even a single Merkle tree block, and (b) f2fs encryption doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * encrypt xattrs, yet the verity metadata *must* be encrypted when the file is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * because it contains hashes of the plaintext data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Using a 64K boundary rather than a 4K one keeps things ready for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * architectures with 64K pages, and it doesn't necessarily waste space on-disk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * since there can be a hole between i_size and the start of the Merkle tree.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/f2fs_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include "f2fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include "xattr.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define F2FS_VERIFY_VER (1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static inline loff_t f2fs_verity_metadata_pos(const struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return round_up(inode->i_size, 65536);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * Read some verity metadata from the inode. __vfs_read() can't be used because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * we need to read beyond i_size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static int pagecache_read(struct inode *inode, void *buf, size_t count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) loff_t pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) while (count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) size_t n = min_t(size_t, count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) PAGE_SIZE - offset_in_page(pos));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) void *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) page = read_mapping_page(inode->i_mapping, pos >> PAGE_SHIFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (IS_ERR(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return PTR_ERR(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) addr = kmap_atomic(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) memcpy(buf, addr + offset_in_page(pos), n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) kunmap_atomic(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) buf += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) pos += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) count -= n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * Write some verity metadata to the inode for FS_IOC_ENABLE_VERITY.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * kernel_write() can't be used because the file descriptor is readonly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static int pagecache_write(struct inode *inode, const void *buf, size_t count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) loff_t pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (pos + count > inode->i_sb->s_maxbytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return -EFBIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) while (count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) size_t n = min_t(size_t, count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) PAGE_SIZE - offset_in_page(pos));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) void *fsdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) void *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) res = pagecache_write_begin(NULL, inode->i_mapping, pos, n, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) &page, &fsdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) addr = kmap_atomic(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) memcpy(addr + offset_in_page(pos), buf, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) kunmap_atomic(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) res = pagecache_write_end(NULL, inode->i_mapping, pos, n, n,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) page, fsdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (res < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (res != n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) buf += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) pos += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) count -= n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * Format of f2fs verity xattr. This points to the location of the verity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * descriptor within the file data rather than containing it directly because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * the verity descriptor *must* be encrypted when f2fs encryption is used. But,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) * f2fs encryption does not encrypt xattrs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct fsverity_descriptor_location {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) __le32 version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) __le32 size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) __le64 pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static int f2fs_begin_enable_verity(struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct inode *inode = file_inode(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (f2fs_verity_in_progress(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (f2fs_is_atomic_file(inode) || f2fs_is_volatile_file(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) * Since the file was opened readonly, we have to initialize the quotas
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) * here and not rely on ->open() doing it. This must be done before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * evicting the inline data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) err = dquot_initialize(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) err = f2fs_convert_inline_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) set_inode_flag(inode, FI_VERITY_IN_PROGRESS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static int f2fs_end_enable_verity(struct file *filp, const void *desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) size_t desc_size, u64 merkle_tree_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct inode *inode = file_inode(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) u64 desc_pos = f2fs_verity_metadata_pos(inode) + merkle_tree_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) struct fsverity_descriptor_location dloc = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) .version = cpu_to_le32(F2FS_VERIFY_VER),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) .size = cpu_to_le32(desc_size),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) .pos = cpu_to_le64(desc_pos),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) int err = 0, err2 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * If an error already occurred (which fs/verity/ signals by passing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * desc == NULL), then only clean-up is needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) if (desc == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) /* Append the verity descriptor. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) err = pagecache_write(inode, desc, desc_size, desc_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * Write all pages (both data and verity metadata). Note that this must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * happen before clearing FI_VERITY_IN_PROGRESS; otherwise pages beyond
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * i_size won't be written properly. For crash consistency, this also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * must happen before the verity inode flag gets persisted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) err = filemap_write_and_wait(inode->i_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /* Set the verity xattr. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_VERITY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) F2FS_XATTR_NAME_VERITY, &dloc, sizeof(dloc),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) NULL, XATTR_CREATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) /* Finally, set the verity inode flag. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) file_set_verity(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) f2fs_set_inode_flags(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) f2fs_mark_inode_dirty_sync(inode, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) clear_inode_flag(inode, FI_VERITY_IN_PROGRESS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * Verity failed to be enabled, so clean up by truncating any verity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * metadata that was written beyond i_size (both from cache and from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * disk) and clearing FI_VERITY_IN_PROGRESS.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * Taking i_gc_rwsem[WRITE] is needed to stop f2fs garbage collection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * from re-instantiating cached pages we are truncating (since unlike
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * normal file accesses, garbage collection isn't limited by i_size).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) truncate_inode_pages(inode->i_mapping, inode->i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) err2 = f2fs_truncate(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (err2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) f2fs_err(sbi, "Truncating verity metadata failed (errno=%d)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) err2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) set_sbi_flag(sbi, SBI_NEED_FSCK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) clear_inode_flag(inode, FI_VERITY_IN_PROGRESS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) return err ?: err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) static int f2fs_get_verity_descriptor(struct inode *inode, void *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) size_t buf_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) struct fsverity_descriptor_location dloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) u32 size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) u64 pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /* Get the descriptor location */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) res = f2fs_getxattr(inode, F2FS_XATTR_INDEX_VERITY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) F2FS_XATTR_NAME_VERITY, &dloc, sizeof(dloc), NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (res < 0 && res != -ERANGE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (res != sizeof(dloc) || dloc.version != cpu_to_le32(F2FS_VERIFY_VER)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) f2fs_warn(F2FS_I_SB(inode), "unknown verity xattr format");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) size = le32_to_cpu(dloc.size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) pos = le64_to_cpu(dloc.pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* Get the descriptor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (pos + size < pos || pos + size > inode->i_sb->s_maxbytes ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) pos < f2fs_verity_metadata_pos(inode) || size > INT_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) f2fs_warn(F2FS_I_SB(inode), "invalid verity xattr");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (buf_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (size > buf_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) res = pagecache_read(inode, buf, size, pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if (res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static struct page *f2fs_read_merkle_tree_page(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) pgoff_t index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) unsigned long num_ra_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) DEFINE_READAHEAD(ractl, NULL, inode->i_mapping, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) index += f2fs_verity_metadata_pos(inode) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) page = find_get_page_flags(inode->i_mapping, index, FGP_ACCESSED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) if (!page || !PageUptodate(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if (page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) else if (num_ra_pages > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) page_cache_ra_unbounded(&ractl, num_ra_pages, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) page = read_mapping_page(inode->i_mapping, index, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) return page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) static int f2fs_write_merkle_tree_block(struct inode *inode, const void *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) u64 index, int log_blocksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) loff_t pos = f2fs_verity_metadata_pos(inode) + (index << log_blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) return pagecache_write(inode, buf, 1 << log_blocksize, pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) const struct fsverity_operations f2fs_verityops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) .begin_enable_verity = f2fs_begin_enable_verity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) .end_enable_verity = f2fs_end_enable_verity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) .get_verity_descriptor = f2fs_get_verity_descriptor,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) .read_merkle_tree_page = f2fs_read_merkle_tree_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) .write_merkle_tree_block = f2fs_write_merkle_tree_block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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