When loading an inode from disk, verify that its mode is valid.
If invalid, return EINVAL. Note that inode check-hashes greatly reduce the chance that these errors will go undetected. Reported by: Christopher Krah <krah@protonmail.com> Reported as: FS-5-UFS-2: Denial Of Service in nmount-3 (ffs_read) Reviewed by: kib MFC after: 1 week Sponsored by: Netflix M sys/fs/ext2fs/ext2_vnops.c M sys/kern/vfs_subr.c M sys/ufs/ffs/ffs_snapshot.c M sys/ufs/ufs/ufs_vnops.c
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@ -1920,6 +1920,11 @@ ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
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vp = *vpp;
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ip = VTOI(vp);
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vp->v_type = IFTOVT(ip->i_mode);
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/*
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* Only unallocated inodes should be of type VNON.
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*/
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if (ip->i_mode != 0 && vp->v_type == VNON)
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return (EINVAL);
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if (vp->v_type == VFIFO)
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vp->v_op = fifoops;
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@ -156,7 +156,7 @@ SYSCTL_ULONG(_vfs, OID_AUTO, mnt_free_list_batch, CTLFLAG_RW,
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*/
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enum vtype iftovt_tab[16] = {
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VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
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VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
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VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VNON
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};
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int vttoif_tab[10] = {
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0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK,
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@ -2001,15 +2001,19 @@ ffs_snapshot_mount(mp)
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continue;
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}
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ip = VTOI(vp);
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if (!IS_SNAPSHOT(ip) || ip->i_size ==
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lblktosize(fs, howmany(fs->fs_size, fs->fs_frag))) {
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if (!IS_SNAPSHOT(ip)) {
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if (vp->v_type != VREG) {
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reason = "non-file snapshot";
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} else if (!IS_SNAPSHOT(ip)) {
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reason = "non-snapshot";
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} else {
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} else if (ip->i_size ==
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lblktosize(fs, howmany(fs->fs_size, fs->fs_frag))) {
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reason = "old format snapshot";
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(void)ffs_truncate(vp, (off_t)0, 0, NOCRED);
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(void)ffs_syncvnode(vp, MNT_WAIT, 0);
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} else {
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reason = NULL;
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}
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if (reason != NULL) {
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printf("ffs_snapshot_mount: %s inode %d\n",
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reason, fs->fs_snapinum[snaploc]);
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vput(vp);
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@ -2517,6 +2517,11 @@ ufs_vinit(mntp, fifoops, vpp)
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vp = *vpp;
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ip = VTOI(vp);
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vp->v_type = IFTOVT(ip->i_mode);
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/*
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* Only unallocated inodes should be of type VNON.
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*/
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if (ip->i_mode != 0 && vp->v_type == VNON)
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return (EINVAL);
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if (vp->v_type == VFIFO)
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vp->v_op = fifoops;
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ASSERT_VOP_LOCKED(vp, "ufs_vinit");
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