From 7ffc14e8a8b81a2dcda67ac7106edfd1bd93c486 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Mon, 10 Sep 2012 20:17:44 -0700 Subject: [PATCH] userns: Pass a userns parameter into posix_acl_to_xattr and posix_acl_from_xattr - Pass the user namespace the uid and gid values in the xattr are stored in into posix_acl_from_xattr. - Pass the user namespace kuid and kgid values should be converted into when storing uid and gid values in an xattr in posix_acl_to_xattr. - Modify all callers of posix_acl_from_xattr and posix_acl_to_xattr to pass in &init_user_ns. In the short term this change is not strictly needed but it makes the code clearer. In the longer term this change is necessary to be able to mount filesystems outside of the initial user namespace that natively store posix acls in the linux xattr format. Change-Id: I7c2b18f16ec9d7ded49135cedc2e91a71e078087 Cc: Theodore Tso Cc: Andrew Morton Cc: Andreas Dilger Cc: Jan Kara Cc: Al Viro Signed-off-by: "Eric W. Biederman" --- fs/9p/acl.c | 8 ++++---- fs/btrfs/acl.c | 8 ++++---- fs/ext2/acl.c | 4 ++-- fs/ext3/acl.c | 4 ++-- fs/ext4/acl.c | 4 ++-- fs/f2fs/acl.c | 4 ++-- fs/generic_acl.c | 4 ++-- fs/gfs2/acl.c | 14 +++++++------- fs/jffs2/acl.c | 4 ++-- fs/jfs/acl.c | 4 ++-- fs/jfs/xattr.c | 4 ++-- fs/nfs/nfs3acl.c | 4 ++-- fs/nfsd/vfs.c | 8 ++++---- fs/ocfs2/acl.c | 4 ++-- fs/reiserfs/xattr_acl.c | 4 ++-- fs/xattr_acl.c | 14 ++++++++------ fs/xfs/xfs_acl.c | 4 ++-- include/linux/posix_acl_xattr.h | 6 ++++-- 18 files changed, 55 insertions(+), 51 deletions(-) diff --git a/fs/9p/acl.c b/fs/9p/acl.c index a4188cfcc9f..27886efe87f 100644 --- a/fs/9p/acl.c +++ b/fs/9p/acl.c @@ -37,7 +37,7 @@ static struct posix_acl *__v9fs_get_acl(struct p9_fid *fid, char *name) return ERR_PTR(-ENOMEM); size = v9fs_fid_xattr_get(fid, name, value, size); if (size > 0) { - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) goto err_out; } @@ -131,7 +131,7 @@ static int v9fs_set_acl(struct dentry *dentry, int type, struct posix_acl *acl) buffer = kmalloc(size, GFP_KERNEL); if (!buffer) return -ENOMEM; - retval = posix_acl_to_xattr(acl, buffer, size); + retval = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); if (retval < 0) goto err_free_out; switch (type) { @@ -251,7 +251,7 @@ static int v9fs_xattr_get_acl(struct dentry *dentry, const char *name, return PTR_ERR(acl); if (acl == NULL) return -ENODATA; - error = posix_acl_to_xattr(acl, buffer, size); + error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); posix_acl_release(acl); return error; @@ -304,7 +304,7 @@ static int v9fs_xattr_set_acl(struct dentry *dentry, const char *name, return -EPERM; if (value) { /* update the cached acl value */ - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) return PTR_ERR(acl); else if (acl) { diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c index 9f55b545ea4..0b537ad2f70 100644 --- a/fs/btrfs/acl.c +++ b/fs/btrfs/acl.c @@ -61,7 +61,7 @@ struct posix_acl *btrfs_get_acl(struct inode *inode, int type) size = __btrfs_getxattr(inode, name, value, size); } if (size > 0) { - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); } else if (size == -ENOENT || size == -ENODATA || size == 0) { /* FIXME, who returns -ENOENT? I think nobody */ acl = NULL; @@ -91,7 +91,7 @@ static int btrfs_xattr_acl_get(struct dentry *dentry, const char *name, return PTR_ERR(acl); if (acl == NULL) return -ENODATA; - ret = posix_acl_to_xattr(acl, value, size); + ret = posix_acl_to_xattr(&init_user_ns, acl, value, size); posix_acl_release(acl); return ret; @@ -141,7 +141,7 @@ static int btrfs_set_acl(struct btrfs_trans_handle *trans, goto out; } - ret = posix_acl_to_xattr(acl, value, size); + ret = posix_acl_to_xattr(&init_user_ns, acl, value, size); if (ret < 0) goto out; } @@ -169,7 +169,7 @@ static int btrfs_xattr_acl_set(struct dentry *dentry, const char *name, return -EOPNOTSUPP; if (value) { - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) return PTR_ERR(acl); diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c index e38a9b61af3..3b067882ae9 100644 --- a/fs/ext2/acl.c +++ b/fs/ext2/acl.c @@ -346,7 +346,7 @@ ext2_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer, return PTR_ERR(acl); if (acl == NULL) return -ENODATA; - error = posix_acl_to_xattr(acl, buffer, size); + error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); posix_acl_release(acl); return error; @@ -367,7 +367,7 @@ ext2_xattr_set_acl(struct dentry *dentry, const char *name, const void *value, return -EPERM; if (value) { - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) return PTR_ERR(acl); else if (acl) { diff --git a/fs/ext3/acl.c b/fs/ext3/acl.c index f3326ca3415..e8190c21dab 100644 --- a/fs/ext3/acl.c +++ b/fs/ext3/acl.c @@ -365,7 +365,7 @@ ext3_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer, return PTR_ERR(acl); if (acl == NULL) return -ENODATA; - error = posix_acl_to_xattr(acl, buffer, size); + error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); posix_acl_release(acl); return error; @@ -388,7 +388,7 @@ ext3_xattr_set_acl(struct dentry *dentry, const char *name, const void *value, return -EPERM; if (value) { - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) return PTR_ERR(acl); else if (acl) { diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c index 5d419a496d9..1b24291b676 100644 --- a/fs/ext4/acl.c +++ b/fs/ext4/acl.c @@ -370,7 +370,7 @@ ext4_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer, return PTR_ERR(acl); if (acl == NULL) return -ENODATA; - error = posix_acl_to_xattr(acl, buffer, size); + error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); posix_acl_release(acl); return error; @@ -393,7 +393,7 @@ ext4_xattr_set_acl(struct dentry *dentry, const char *name, const void *value, return -EPERM; if (value) { - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) return PTR_ERR(acl); else if (acl) { diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c index 97b32bf9b5e..e4ca7554a79 100644 --- a/fs/f2fs/acl.c +++ b/fs/f2fs/acl.c @@ -346,7 +346,7 @@ static int f2fs_xattr_get_acl(struct dentry *dentry, const char *name, return PTR_ERR(acl); if (!acl) return -ENODATA; - error = posix_acl_to_xattr(acl, buffer, size); + error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); posix_acl_release(acl); return error; @@ -368,7 +368,7 @@ static int f2fs_xattr_set_acl(struct dentry *dentry, const char *name, return -EPERM; if (value) { - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) return PTR_ERR(acl); if (acl) { diff --git a/fs/generic_acl.c b/fs/generic_acl.c index e9c0746e820..21408084c3b 100644 --- a/fs/generic_acl.c +++ b/fs/generic_acl.c @@ -56,7 +56,7 @@ generic_acl_get(struct dentry *dentry, const char *name, void *buffer, acl = get_cached_acl(dentry->d_inode, type); if (!acl) return -ENODATA; - error = posix_acl_to_xattr(acl, buffer, size); + error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); posix_acl_release(acl); return error; @@ -77,7 +77,7 @@ generic_acl_set(struct dentry *dentry, const char *name, const void *value, if (!inode_owner_or_capable(inode)) return -EPERM; if (value) { - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) return PTR_ERR(acl); } diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c index 846611f2e41..ea4b4585ae1 100644 --- a/fs/gfs2/acl.c +++ b/fs/gfs2/acl.c @@ -63,7 +63,7 @@ struct posix_acl *gfs2_get_acl(struct inode *inode, int type) if (len == 0) return NULL; - acl = posix_acl_from_xattr(data, len); + acl = posix_acl_from_xattr(&init_user_ns, data, len); kfree(data); return acl; } @@ -92,13 +92,13 @@ static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl) const char *name = gfs2_acl_name(type); BUG_ON(name == NULL); - len = posix_acl_to_xattr(acl, NULL, 0); + len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0); if (len == 0) return 0; data = kmalloc(len, GFP_NOFS); if (data == NULL) return -ENOMEM; - error = posix_acl_to_xattr(acl, data, len); + error = posix_acl_to_xattr(&init_user_ns, acl, data, len); if (error < 0) goto out; error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS); @@ -172,12 +172,12 @@ int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr) if (error) return error; - len = posix_acl_to_xattr(acl, NULL, 0); + len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0); data = kmalloc(len, GFP_NOFS); error = -ENOMEM; if (data == NULL) goto out; - posix_acl_to_xattr(acl, data, len); + posix_acl_to_xattr(&init_user_ns, acl, data, len); error = gfs2_xattr_acl_chmod(ip, attr, data); kfree(data); set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl); @@ -218,7 +218,7 @@ static int gfs2_xattr_system_get(struct dentry *dentry, const char *name, if (acl == NULL) return -ENODATA; - error = posix_acl_to_xattr(acl, buffer, size); + error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); posix_acl_release(acl); return error; @@ -251,7 +251,7 @@ static int gfs2_xattr_system_set(struct dentry *dentry, const char *name, if (!value) goto set_acl; - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (!acl) { /* * acl_set_file(3) may request that we set default ACLs with diff --git a/fs/jffs2/acl.c b/fs/jffs2/acl.c index 398e5c71c50..85b3c4c0196 100644 --- a/fs/jffs2/acl.c +++ b/fs/jffs2/acl.c @@ -362,7 +362,7 @@ static int jffs2_acl_getxattr(struct dentry *dentry, const char *name, return PTR_ERR(acl); if (!acl) return -ENODATA; - rc = posix_acl_to_xattr(acl, buffer, size); + rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); posix_acl_release(acl); return rc; @@ -380,7 +380,7 @@ static int jffs2_acl_setxattr(struct dentry *dentry, const char *name, return -EPERM; if (value) { - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) return PTR_ERR(acl); if (acl) { diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c index 45559dc3ea2..d254d6d3599 100644 --- a/fs/jfs/acl.c +++ b/fs/jfs/acl.c @@ -64,7 +64,7 @@ struct posix_acl *jfs_get_acl(struct inode *inode, int type) else acl = ERR_PTR(size); } else { - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); } kfree(value); if (!IS_ERR(acl)) @@ -100,7 +100,7 @@ static int jfs_set_acl(tid_t tid, struct inode *inode, int type, value = kmalloc(size, GFP_KERNEL); if (!value) return -ENOMEM; - rc = posix_acl_to_xattr(acl, value, size); + rc = posix_acl_to_xattr(&init_user_ns, acl, value, size); if (rc < 0) goto out; } diff --git a/fs/jfs/xattr.c b/fs/jfs/xattr.c index 41a0735314f..c79b1d7a53e 100644 --- a/fs/jfs/xattr.c +++ b/fs/jfs/xattr.c @@ -685,7 +685,7 @@ static int can_set_system_xattr(struct inode *inode, const char *name, * POSIX_ACL_XATTR_ACCESS is tied to i_mode */ if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) { - acl = posix_acl_from_xattr(value, value_len); + acl = posix_acl_from_xattr(&init_user_ns, value, value_len); if (IS_ERR(acl)) { rc = PTR_ERR(acl); printk(KERN_ERR "posix_acl_from_xattr returned %d\n", @@ -710,7 +710,7 @@ static int can_set_system_xattr(struct inode *inode, const char *name, return 0; } else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) { - acl = posix_acl_from_xattr(value, value_len); + acl = posix_acl_from_xattr(&init_user_ns, value, value_len); if (IS_ERR(acl)) { rc = PTR_ERR(acl); printk(KERN_ERR "posix_acl_from_xattr returned %d\n", diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c index e4498dc351a..4a1aafba6a2 100644 --- a/fs/nfs/nfs3acl.c +++ b/fs/nfs/nfs3acl.c @@ -70,7 +70,7 @@ ssize_t nfs3_getxattr(struct dentry *dentry, const char *name, if (type == ACL_TYPE_ACCESS && acl->a_count == 0) error = -ENODATA; else - error = posix_acl_to_xattr(acl, buffer, size); + error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); posix_acl_release(acl); } else error = -ENODATA; @@ -92,7 +92,7 @@ int nfs3_setxattr(struct dentry *dentry, const char *name, else return -EOPNOTSUPP; - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) return PTR_ERR(acl); error = nfs3_proc_setacl(inode, type, acl); diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 36620e65158..caf3bab2409 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -517,7 +517,7 @@ set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) if (buf == NULL) goto out; - len = posix_acl_to_xattr(pacl, buf, buflen); + len = posix_acl_to_xattr(&init_user_ns, pacl, buf, buflen); if (len < 0) { error = len; goto out; @@ -586,7 +586,7 @@ _get_posix_acl(struct dentry *dentry, char *key) if (buflen <= 0) return ERR_PTR(buflen); - pacl = posix_acl_from_xattr(buf, buflen); + pacl = posix_acl_from_xattr(&init_user_ns, buf, buflen); kfree(buf); return pacl; } @@ -2299,7 +2299,7 @@ nfsd_get_posix_acl(struct svc_fh *fhp, int type) if (size < 0) return ERR_PTR(size); - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); kfree(value); return acl; } @@ -2332,7 +2332,7 @@ nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) value = kmalloc(size, GFP_KERNEL); if (!value) return -ENOMEM; - error = posix_acl_to_xattr(acl, value, size); + error = posix_acl_to_xattr(&init_user_ns, acl, value, size); if (error < 0) goto getout; size = error; diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c index eed868e9a89..3283555e470 100644 --- a/fs/ocfs2/acl.c +++ b/fs/ocfs2/acl.c @@ -446,7 +446,7 @@ static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name, return PTR_ERR(acl); if (acl == NULL) return -ENODATA; - ret = posix_acl_to_xattr(acl, buffer, size); + ret = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); posix_acl_release(acl); return ret; @@ -469,7 +469,7 @@ static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name, return -EPERM; if (value) { - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) return PTR_ERR(acl); else if (acl) { diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c index 502254b6432..690d5457af2 100644 --- a/fs/reiserfs/xattr_acl.c +++ b/fs/reiserfs/xattr_acl.c @@ -30,7 +30,7 @@ posix_acl_set(struct dentry *dentry, const char *name, const void *value, return -EPERM; if (value) { - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) { return PTR_ERR(acl); } else if (acl) { @@ -77,7 +77,7 @@ posix_acl_get(struct dentry *dentry, const char *name, void *buffer, return PTR_ERR(acl); if (acl == NULL) return -ENODATA; - error = posix_acl_to_xattr(acl, buffer, size); + error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); posix_acl_release(acl); return error; diff --git a/fs/xattr_acl.c b/fs/xattr_acl.c index bf472ca1b34..11efd830b5f 100644 --- a/fs/xattr_acl.c +++ b/fs/xattr_acl.c @@ -73,7 +73,8 @@ void posix_acl_fix_xattr_to_user(void *value, size_t size) * Convert from extended attribute to in-memory representation. */ struct posix_acl * -posix_acl_from_xattr(const void *value, size_t size) +posix_acl_from_xattr(struct user_namespace *user_ns, + const void *value, size_t size) { posix_acl_xattr_header *header = (posix_acl_xattr_header *)value; posix_acl_xattr_entry *entry = (posix_acl_xattr_entry *)(header+1), *end; @@ -112,14 +113,14 @@ posix_acl_from_xattr(const void *value, size_t size) case ACL_USER: acl_e->e_uid = - make_kuid(&init_user_ns, + make_kuid(user_ns, le32_to_cpu(entry->e_id)); if (!uid_valid(acl_e->e_uid)) goto fail; break; case ACL_GROUP: acl_e->e_gid = - make_kgid(&init_user_ns, + make_kgid(user_ns, le32_to_cpu(entry->e_id)); if (!gid_valid(acl_e->e_gid)) goto fail; @@ -141,7 +142,8 @@ EXPORT_SYMBOL (posix_acl_from_xattr); * Convert from in-memory to extended attribute representation. */ int -posix_acl_to_xattr(const struct posix_acl *acl, void *buffer, size_t size) +posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl, + void *buffer, size_t size) { posix_acl_xattr_header *ext_acl = (posix_acl_xattr_header *)buffer; posix_acl_xattr_entry *ext_entry = ext_acl->a_entries; @@ -162,11 +164,11 @@ posix_acl_to_xattr(const struct posix_acl *acl, void *buffer, size_t size) switch(acl_e->e_tag) { case ACL_USER: ext_entry->e_id = - cpu_to_le32(from_kuid(&init_user_ns, acl_e->e_uid)); + cpu_to_le32(from_kuid(user_ns, acl_e->e_uid)); break; case ACL_GROUP: ext_entry->e_id = - cpu_to_le32(from_kgid(&init_user_ns, acl_e->e_gid)); + cpu_to_le32(from_kgid(user_ns, acl_e->e_gid)); break; default: ext_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c index c0f97c319b7..fb853c7b2b7 100644 --- a/fs/xfs/xfs_acl.c +++ b/fs/xfs/xfs_acl.c @@ -337,7 +337,7 @@ xfs_xattr_acl_get(struct dentry *dentry, const char *name, if (acl == NULL) return -ENODATA; - error = posix_acl_to_xattr(acl, value, size); + error = posix_acl_to_xattr(&init_user_ns, acl, value, size); posix_acl_release(acl); return error; @@ -361,7 +361,7 @@ xfs_xattr_acl_set(struct dentry *dentry, const char *name, if (!value) goto set_acl; - acl = posix_acl_from_xattr(value, size); + acl = posix_acl_from_xattr(&init_user_ns, value, size); if (!acl) { /* * acl_set_file(3) may request that we set default ACLs with diff --git a/include/linux/posix_acl_xattr.h b/include/linux/posix_acl_xattr.h index 8bd5fcf0691..ad93ad0f1db 100644 --- a/include/linux/posix_acl_xattr.h +++ b/include/linux/posix_acl_xattr.h @@ -64,7 +64,9 @@ static inline void posix_acl_fix_xattr_to_user(void *value, size_t size) } #endif -struct posix_acl *posix_acl_from_xattr(const void *value, size_t size); -int posix_acl_to_xattr(const struct posix_acl *acl, void *buffer, size_t size); +struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, + const void *value, size_t size); +int posix_acl_to_xattr(struct user_namespace *user_ns, + const struct posix_acl *acl, void *buffer, size_t size); #endif /* _POSIX_ACL_XATTR_H */