diff options
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_ioctl32.c | 136 | ||||
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_ioctl32.h | 12 |
2 files changed, 147 insertions, 1 deletions
diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.c b/fs/xfs/linux-2.6/xfs_ioctl32.c index cc1fe96efab..e7eb0d7e0d5 100644 --- a/fs/xfs/linux-2.6/xfs_ioctl32.c +++ b/fs/xfs/linux-2.6/xfs_ioctl32.c @@ -46,6 +46,7 @@ #include "xfs_fsops.h" #include "xfs_alloc.h" #include "xfs_rtalloc.h" +#include "xfs_attr.h" #include "xfs_ioctl.h" #include "xfs_ioctl32.h" @@ -343,6 +344,138 @@ xfs_compat_handlereq_copyin( return 0; } +/* + * Convert userspace handle data into inode. + * + * We use the fact that all the fsop_handlereq ioctl calls have a data + * structure argument whose first component is always a xfs_fsop_handlereq_t, + * so we can pass that sub structure into this handy, shared routine. + * + * If no error, caller must always iput the returned inode. + */ +STATIC int +xfs_vget_fsop_handlereq_compat( + xfs_mount_t *mp, + struct inode *parinode, /* parent inode pointer */ + compat_xfs_fsop_handlereq_t *hreq, + struct inode **inode) +{ + void __user *hanp; + size_t hlen; + xfs_fid_t *xfid; + xfs_handle_t *handlep; + xfs_handle_t handle; + xfs_inode_t *ip; + xfs_ino_t ino; + __u32 igen; + int error; + + /* + * Only allow handle opens under a directory. + */ + if (!S_ISDIR(parinode->i_mode)) + return XFS_ERROR(ENOTDIR); + + hanp = compat_ptr(hreq->ihandle); + hlen = hreq->ihandlen; + handlep = &handle; + + if (hlen < sizeof(handlep->ha_fsid) || hlen > sizeof(*handlep)) + return XFS_ERROR(EINVAL); + if (copy_from_user(handlep, hanp, hlen)) + return XFS_ERROR(EFAULT); + if (hlen < sizeof(*handlep)) + memset(((char *)handlep) + hlen, 0, sizeof(*handlep) - hlen); + if (hlen > sizeof(handlep->ha_fsid)) { + if (handlep->ha_fid.fid_len != + (hlen - sizeof(handlep->ha_fsid) - + sizeof(handlep->ha_fid.fid_len)) || + handlep->ha_fid.fid_pad) + return XFS_ERROR(EINVAL); + } + + /* + * Crack the handle, obtain the inode # & generation # + */ + xfid = (struct xfs_fid *)&handlep->ha_fid; + if (xfid->fid_len == sizeof(*xfid) - sizeof(xfid->fid_len)) { + ino = xfid->fid_ino; + igen = xfid->fid_gen; + } else { + return XFS_ERROR(EINVAL); + } + + /* + * Get the XFS inode, building a Linux inode to go with it. + */ + error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0); + if (error) + return error; + if (ip == NULL) + return XFS_ERROR(EIO); + if (ip->i_d.di_gen != igen) { + xfs_iput_new(ip, XFS_ILOCK_SHARED); + return XFS_ERROR(ENOENT); + } + + xfs_iunlock(ip, XFS_ILOCK_SHARED); + + *inode = VFS_I(ip); + return 0; +} + +STATIC int +xfs_compat_attrlist_by_handle( + xfs_mount_t *mp, + void __user *arg, + struct inode *parinode) +{ + int error; + attrlist_cursor_kern_t *cursor; + compat_xfs_fsop_attrlist_handlereq_t al_hreq; + struct inode *inode; + char *kbuf; + + if (!capable(CAP_SYS_ADMIN)) + return -XFS_ERROR(EPERM); + if (copy_from_user(&al_hreq, arg, + sizeof(compat_xfs_fsop_attrlist_handlereq_t))) + return -XFS_ERROR(EFAULT); + if (al_hreq.buflen > XATTR_LIST_MAX) + return -XFS_ERROR(EINVAL); + + /* + * Reject flags, only allow namespaces. + */ + if (al_hreq.flags & ~(ATTR_ROOT | ATTR_SECURE)) + return -XFS_ERROR(EINVAL); + + error = xfs_vget_fsop_handlereq_compat(mp, parinode, &al_hreq.hreq, + &inode); + if (error) + goto out; + + kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL); + if (!kbuf) + goto out_vn_rele; + + cursor = (attrlist_cursor_kern_t *)&al_hreq.pos; + error = xfs_attr_list(XFS_I(inode), kbuf, al_hreq.buflen, + al_hreq.flags, cursor); + if (error) + goto out_kfree; + + if (copy_to_user(compat_ptr(al_hreq.buffer), kbuf, al_hreq.buflen)) + error = -EFAULT; + + out_kfree: + kfree(kbuf); + out_vn_rele: + iput(inode); + out: + return -error; +} + STATIC long xfs_compat_ioctl( xfs_inode_t *ip, @@ -368,7 +501,6 @@ xfs_compat_ioctl( case XFS_IOC_GETBMAPX: /* not handled case XFS_IOC_FSSETDM_BY_HANDLE: - case XFS_IOC_ATTRLIST_BY_HANDLE: case XFS_IOC_ATTRMULTI_BY_HANDLE: */ case XFS_IOC_FSCOUNTS: @@ -476,6 +608,8 @@ xfs_compat_ioctl( return -XFS_ERROR(EFAULT); return xfs_readlink_by_handle(mp, &hreq, inode); } + case XFS_IOC_ATTRLIST_BY_HANDLE_32: + return xfs_compat_attrlist_by_handle(mp, arg, inode); default: return -XFS_ERROR(ENOIOCTLCMD); } diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.h b/fs/xfs/linux-2.6/xfs_ioctl32.h index 8b2a12a8e96..bbf3a2cd8a7 100644 --- a/fs/xfs/linux-2.6/xfs_ioctl32.h +++ b/fs/xfs/linux-2.6/xfs_ioctl32.h @@ -123,6 +123,18 @@ typedef struct compat_xfs_swapext { #define XFS_IOC_SWAPEXT_32 _IOWR('X', 109, struct compat_xfs_swapext) +typedef struct compat_xfs_fsop_attrlist_handlereq { + struct compat_xfs_fsop_handlereq hreq; /* handle interface structure */ + struct xfs_attrlist_cursor pos; /* opaque cookie, list offset */ + __u32 flags; /* which namespace to use */ + __u32 buflen; /* length of buffer supplied */ + compat_uptr_t buffer; /* returned names */ +} __compat_packed compat_xfs_fsop_attrlist_handlereq_t; + +/* Note: actually this is read/write */ +#define XFS_IOC_ATTRLIST_BY_HANDLE_32 \ + _IOW('X', 122, struct compat_xfs_fsop_attrlist_handlereq) + #ifdef BROKEN_X86_ALIGNMENT /* on ia32 l_start is on a 32-bit boundary */ typedef struct compat_xfs_flock64 { |