// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2017 Oracle. All Rights Reserved. * Author: Darrick J. Wong */ #include "xfs.h" #include "xfs_fs.h" #include "xfs_shared.h" #include "xfs_format.h" #include "xfs_trans_resv.h" #include "xfs_mount.h" #include "xfs_btree.h" #include "xfs_log_format.h" #include "xfs_inode.h" #include "xfs_ialloc.h" #include "xfs_da_format.h" #include "xfs_reflink.h" #include "xfs_rmap.h" #include "xfs_bmap_util.h" #include "scrub/scrub.h" #include "scrub/common.h" #include "scrub/btree.h" /* * Grab total control of the inode metadata. It doesn't matter here if * the file data is still changing; exclusive access to the metadata is * the goal. */ int xchk_setup_inode( struct xfs_scrub *sc, struct xfs_inode *ip) { int error; /* * Try to get the inode. If the verifiers fail, we try again * in raw mode. */ error = xchk_get_inode(sc, ip); switch (error) { case 0: break; case -EFSCORRUPTED: case -EFSBADCRC: return xchk_trans_alloc(sc, 0); default: return error; } /* Got the inode, lock it and we're ready to go. */ sc->ilock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; xfs_ilock(sc->ip, sc->ilock_flags); error = xchk_trans_alloc(sc, 0); if (error) goto out; sc->ilock_flags |= XFS_ILOCK_EXCL; xfs_ilock(sc->ip, XFS_ILOCK_EXCL); out: /* scrub teardown will unlock and release the inode for us */ return error; } /* Inode core */ /* Validate di_extsize hint. */ STATIC void xchk_inode_extsize( struct xfs_scrub *sc, struct xfs_dinode *dip, xfs_ino_t ino, uint16_t mode, uint16_t flags) { xfs_failaddr_t fa; fa = xfs_inode_validate_extsize(sc->mp, be32_to_cpu(dip->di_extsize), mode, flags); if (fa) xchk_ino_set_corrupt(sc, ino); } /* * Validate di_cowextsize hint. * * The rules are documented at xfs_ioctl_setattr_check_cowextsize(). * These functions must be kept in sync with each other. */ STATIC void xchk_inode_cowextsize( struct xfs_scrub *sc, struct xfs_dinode *dip, xfs_ino_t ino, uint16_t mode, uint16_t flags, uint64_t flags2) { xfs_failaddr_t fa; fa = xfs_inode_validate_cowextsize(sc->mp, be32_to_cpu(dip->di_cowextsize), mode, flags, flags2); if (fa) xchk_ino_set_corrupt(sc, ino); } /* Make sure the di_flags make sense for the inode. */ STATIC void xchk_inode_flags( struct xfs_scrub *sc, struct xfs_dinode *dip, xfs_ino_t ino, uint16_t mode, uint16_t flags) { struct xfs_mount *mp = sc->mp; /* di_flags are all taken, last bit cannot be used */ if (flags & ~XFS_DIFLAG_ANY) goto bad; /* rt flags require rt device */ if ((flags & (XFS_DIFLAG_REALTIME | XFS_DIFLAG_RTINHERIT)) && !mp->m_rtdev_targp) goto bad; /* new rt bitmap flag only valid for rbmino */ if ((flags & XFS_DIFLAG_NEWRTBM) && ino != mp->m_sb.sb_rbmino) goto bad; /* directory-only flags */ if ((flags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS)) && !S_ISDIR(mode)) goto bad; /* file-only flags */ if ((flags & (XFS_DIFLAG_REALTIME | FS_XFLAG_EXTSIZE)) && !S_ISREG(mode)) goto bad; /* filestreams and rt make no sense */ if ((flags & XFS_DIFLAG_FILESTREAM) && (flags & XFS_DIFLAG_REALTIME)) goto bad; return; bad: xchk_ino_set_corrupt(sc, ino); } /* Make sure the di_flags2 make sense for the inode. */ STATIC void xchk_inode_flags2( struct xfs_scrub *sc, struct xfs_dinode *dip, xfs_ino_t ino, uint16_t mode, uint16_t flags, uint64_t flags2) { struct xfs_mount *mp = sc->mp; /* Unknown di_flags2 could be from a future kernel */ if (flags2 & ~XFS_DIFLAG2_ANY) xchk_ino_set_warning(sc, ino); /* reflink flag requires reflink feature */ if ((flags2 & XFS_DIFLAG2_REFLINK) && !xfs_sb_version_hasreflink(&mp->m_sb)) goto bad; /* cowextsize flag is checked w.r.t. mode separately */ /* file/dir-only flags */ if ((flags2 & XFS_DIFLAG2_DAX) && !(S_ISREG(mode) || S_ISDIR(mode))) goto bad; /* file-only flags */ if ((flags2 & XFS_DIFLAG2_REFLINK) && !S_ISREG(mode)) goto bad; /* realtime and reflink make no sense, currently */ if ((flags & XFS_DIFLAG_REALTIME) && (flags2 & XFS_DIFLAG2_REFLINK)) goto bad; /* dax and reflink make no sense, currently */ if ((flags2 & XFS_DIFLAG2_DAX) && (flags2 & XFS_DIFLAG2_REFLINK)) goto bad; return; bad: xchk_ino_set_corrupt(sc, ino); } static inline void xchk_dinode_nsec( struct xfs_scrub *sc, xfs_ino_t ino, const xfs_timestamp_t ts) { struct timespec64 tv; tv = xfs_inode_from_disk_ts(ts); if (tv.tv_nsec < 0 || tv.tv_nsec >= NSEC_PER_SEC) xchk_ino_set_corrupt(sc, ino); } /* Scrub all the ondisk inode fields. */ STATIC void xchk_dinode( struct xfs_scrub *sc, struct xfs_dinode *dip, xfs_ino_t ino) { struct xfs_mount *mp = sc->mp; size_t fork_recs; unsigned long long isize; uint64_t flags2; uint32_t nextents; uint16_t flags; uint16_t mode; flags = be16_to_cpu(dip->di_flags); if (dip->di_version >= 3) flags2 = be64_to_cpu(dip->di_flags2); else flags2 = 0; /* di_mode */ mode = be16_to_cpu(dip->di_mode); switch (mode & S_IFMT) { case S_IFLNK: case S_IFREG: case S_IFDIR: case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK: /* mode is recognized */ break; default: xchk_ino_set_corrupt(sc, ino); break; } /* v1/v2 fields */ switch (dip->di_version) { case 1: /* * We autoconvert v1 inodes into v2 inodes on writeout, * so just mark this inode for preening. */ xchk_ino_set_preen(sc, ino); break; case 2: case 3: if (dip->di_onlink != 0) xchk_ino_set_corrupt(sc, ino); if (dip->di_mode == 0 && sc->ip) xchk_ino_set_corrupt(sc, ino); if (dip->di_projid_hi != 0 && !xfs_sb_version_hasprojid32bit(&mp->m_sb)) xchk_ino_set_corrupt(sc, ino); break; default: xchk_ino_set_corrupt(sc, ino); return; } /* * di_uid/di_gid -- -1 isn't invalid, but there's no way that * userspace could have created that. */ if (dip->di_uid == cpu_to_be32(-1U) || dip->di_gid == cpu_to_be32(-1U)) xchk_ino_set_warning(sc, ino); /* di_format */ switch (dip->di_format) { case XFS_DINODE_FMT_DEV: if (!S_ISCHR(mode) && !S_ISBLK(mode) && !S_ISFIFO(mode) && !S_ISSOCK(mode)) xchk_ino_set_corrupt(sc, ino); break; case XFS_DINODE_FMT_LOCAL: if (!S_ISDIR(mode) && !S_ISLNK(mode)) xchk_ino_set_corrupt(sc, ino); break; case XFS_DINODE_FMT_EXTENTS: if (!S_ISREG(mode) && !S_ISDIR(mode) && !S_ISLNK(mode)) xchk_ino_set_corrupt(sc, ino); break; case XFS_DINODE_FMT_BTREE: if (!S_ISREG(mode) && !S_ISDIR(mode)) xchk_ino_set_corrupt(sc, ino); break; case XFS_DINODE_FMT_UUID: default: xchk_ino_set_corrupt(sc, ino); break; } /* di_[amc]time.nsec */ xchk_dinode_nsec(sc, ino, dip->di_atime); xchk_dinode_nsec(sc, ino, dip->di_mtime); xchk_dinode_nsec(sc, ino, dip->di_ctime); /* * di_size. xfs_dinode_verify checks for things that screw up * the VFS such as the upper bit being set and zero-length * symlinks/directories, but we can do more here. */ isize = be64_to_cpu(dip->di_size); if (isize & (1ULL << 63)) xchk_ino_set_corrupt(sc, ino); /* Devices, fifos, and sockets must have zero size */ if (!S_ISDIR(mode) && !S_ISREG(mode) && !S_ISLNK(mode) && isize != 0) xchk_ino_set_corrupt(sc, ino); /* Directories can't be larger than the data section size (32G) */ if (S_ISDIR(mode) && (isize == 0 || isize >= XFS_DIR2_SPACE_SIZE)) xchk_ino_set_corrupt(sc, ino); /* Symlinks can't be larger than SYMLINK_MAXLEN */ if (S_ISLNK(mode) && (isize == 0 || isize >= XFS_SYMLINK_MAXLEN)) xchk_ino_set_corrupt(sc, ino); /* * Warn if the running kernel can't handle the kinds of offsets * needed to deal with the file size. In other words, if the * pagecache can't cache all the blocks in this file due to * overly large offsets, flag the inode for admin review. */ if (isize >= mp->m_super->s_maxbytes) xchk_ino_set_warning(sc, ino); /* di_nblocks */ if (flags2 & XFS_DIFLAG2_REFLINK) { ; /* nblocks can exceed dblocks */ } else if (flags & XFS_DIFLAG_REALTIME) { /* * nblocks is the sum of data extents (in the rtdev), * attr extents (in the datadev), and both forks' bmbt * blocks (in the datadev). This clumsy check is the * best we can do without cross-referencing with the * inode forks. */ if (be64_to_cpu(dip->di_nblocks) >= mp->m_sb.sb_dblocks + mp->m_sb.sb_rblocks) xchk_ino_set_corrupt(sc, ino); } else { if (be64_to_cpu(dip->di_nblocks) >= mp->m_sb.sb_dblocks) xchk_ino_set_corrupt(sc, ino); } xchk_inode_flags(sc, dip, ino, mode, flags); xchk_inode_extsize(sc, dip, ino, mode, flags); /* di_nextents */ nextents = be32_to_cpu(dip->di_nextents); fork_recs = XFS_DFORK_DSIZE(dip, mp) / sizeof(struct xfs_bmbt_rec); switch (dip->di_format) { case XFS_DINODE_FMT_EXTENTS: if (nextents > fork_recs) xchk_ino_set_corrupt(sc, ino); break; case XFS_DINODE_FMT_BTREE: if (nextents <= fork_recs) xchk_ino_set_corrupt(sc, ino); break; default: if (nextents != 0) xchk_ino_set_corrupt(sc, ino); break; } /* di_forkoff */ if (XFS_DFORK_APTR(dip) >= (char *)dip + mp->m_sb.sb_inodesize) xchk_ino_set_corrupt(sc, ino); if (dip->di_anextents != 0 && dip->di_forkoff == 0) xchk_ino_set_corrupt(sc, ino); if (dip->di_forkoff == 0 && dip->di_aformat != XFS_DINODE_FMT_EXTENTS) xchk_ino_set_corrupt(sc, ino); /* di_aformat */ if (dip->di_aformat != XFS_DINODE_FMT_LOCAL && dip->di_aformat != XFS_DINODE_FMT_EXTENTS && dip->di_aformat != XFS_DINODE_FMT_BTREE) xchk_ino_set_corrupt(sc, ino); /* di_anextents */ nextents = be16_to_cpu(dip->di_anextents); fork_recs = XFS_DFORK_ASIZE(dip, mp) / sizeof(struct xfs_bmbt_rec); switch (dip->di_aformat) { case XFS_DINODE_FMT_EXTENTS: if (nextents > fork_recs) xchk_ino_set_corrupt(sc, ino); break; case XFS_DINODE_FMT_BTREE: if (nextents <= fork_recs) xchk_ino_set_corrupt(sc, ino); break; default: if (nextents != 0) xchk_ino_set_corrupt(sc, ino); } if (dip->di_version >= 3) { xchk_dinode_nsec(sc, ino, dip->di_crtime); xchk_inode_flags2(sc, dip, ino, mode, flags, flags2); xchk_inode_cowextsize(sc, dip, ino, mode, flags, flags2); } } /* * Make sure the finobt doesn't think this inode is free. * We don't have to check the inobt ourselves because we got the inode via * IGET_UNTRUSTED, which checks the inobt for us. */ static void xchk_inode_xref_finobt( struct xfs_scrub *sc, xfs_ino_t ino) { struct xfs_inobt_rec_incore rec; xfs_agino_t agino; int has_record; int error; if (!sc->sa.fino_cur || xchk_skip_xref(sc->sm)) return; agino = XFS_INO_TO_AGINO(sc->mp, ino); /* * Try to get the finobt record. If we can't get it, then we're * in good shape. */ error = xfs_inobt_lookup(sc->sa.fino_cur, agino, XFS_LOOKUP_LE, &has_record); if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) || !has_record) return; error = xfs_inobt_get_rec(sc->sa.fino_cur, &rec, &has_record); if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) || !has_record) return; /* * Otherwise, make sure this record either doesn't cover this inode, * or that it does but it's marked present. */ if (rec.ir_startino > agino || rec.ir_startino + XFS_INODES_PER_CHUNK <= agino) return; if (rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino)) xchk_btree_xref_set_corrupt(sc, sc->sa.fino_cur, 0); } /* Cross reference the inode fields with the forks. */ STATIC void xchk_inode_xref_bmap( struct xfs_scrub *sc, struct xfs_dinode *dip) { xfs_extnum_t nextents; xfs_filblks_t count; xfs_filblks_t acount; int error; if (xchk_skip_xref(sc->sm)) return; /* Walk all the extents to check nextents/naextents/nblocks. */ error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_DATA_FORK, &nextents, &count); if (!xchk_should_check_xref(sc, &error, NULL)) return; if (nextents < be32_to_cpu(dip->di_nextents)) xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino); error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_ATTR_FORK, &nextents, &acount); if (!xchk_should_check_xref(sc, &error, NULL)) return; if (nextents != be16_to_cpu(dip->di_anextents)) xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino); /* Check nblocks against the inode. */ if (count + acount != be64_to_cpu(dip->di_nblocks)) xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino); } /* Cross-reference with the other btrees. */ STATIC void xchk_inode_xref( struct xfs_scrub *sc, xfs_ino_t ino, struct xfs_dinode *dip) { xfs_agnumber_t agno; xfs_agblock_t agbno; int error; if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) return; agno = XFS_INO_TO_AGNO(sc->mp, ino); agbno = XFS_INO_TO_AGBNO(sc->mp, ino); error = xchk_ag_init(sc, agno, &sc->sa); if (!xchk_xref_process_error(sc, agno, agbno, &error)) return; xchk_xref_is_used_space(sc, agbno, 1); xchk_inode_xref_finobt(sc, ino); xchk_xref_is_owned_by(sc, agbno, 1, &XFS_RMAP_OINFO_INODES); xchk_xref_is_not_shared(sc, agbno, 1); xchk_inode_xref_bmap(sc, dip); xchk_ag_free(sc, &sc->sa); } /* * If the reflink iflag disagrees with a scan for shared data fork extents, * either flag an error (shared extents w/ no flag) or a preen (flag set w/o * any shared extents). We already checked for reflink iflag set on a non * reflink filesystem. */ static void xchk_inode_check_reflink_iflag( struct xfs_scrub *sc, xfs_ino_t ino) { struct xfs_mount *mp = sc->mp; bool has_shared; int error; if (!xfs_sb_version_hasreflink(&mp->m_sb)) return; error = xfs_reflink_inode_has_shared_extents(sc->tp, sc->ip, &has_shared); if (!xchk_xref_process_error(sc, XFS_INO_TO_AGNO(mp, ino), XFS_INO_TO_AGBNO(mp, ino), &error)) return; if (xfs_is_reflink_inode(sc->ip) && !has_shared) xchk_ino_set_preen(sc, ino); else if (!xfs_is_reflink_inode(sc->ip) && has_shared) xchk_ino_set_corrupt(sc, ino); } /* Scrub an inode. */ int xchk_inode( struct xfs_scrub *sc) { struct xfs_dinode di; int error = 0; /* * If sc->ip is NULL, that means that the setup function called * xfs_iget to look up the inode. xfs_iget returned a EFSCORRUPTED * and a NULL inode, so flag the corruption error and return. */ if (!sc->ip) { xchk_ino_set_corrupt(sc, sc->sm->sm_ino); return 0; } /* Scrub the inode core. */ xfs_inode_to_disk(sc->ip, &di, 0); xchk_dinode(sc, &di, sc->ip->i_ino); if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) goto out; /* * Look for discrepancies between file's data blocks and the reflink * iflag. We already checked the iflag against the file mode when * we scrubbed the dinode. */ if (S_ISREG(VFS_I(sc->ip)->i_mode)) xchk_inode_check_reflink_iflag(sc, sc->ip->i_ino); xchk_inode_xref(sc, sc->ip->i_ino, &di); out: return error; }