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Groups > linux.kernel > #1285965
| From | Seth Forshee <seth.forshee@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v2 09/18] fs: Refuse uid/gid changes which don't map into s_user_ns |
| Date | 2015-12-07 22:40 +0100 |
| Message-ID | <qDbFM-1D6-25@gated-at.bofh.it> (permalink) |
| References | <qDbw5-1y2-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Add checks to inode_change_ok to verify that uid and gid changes will map into the superblock's user namespace. If they do not fail with -EOVERFLOW. This cannot be overriden with ATTR_FORCE. Signed-off-by: Seth Forshee <seth.forshee@canonical.com> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> --- fs/attr.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/fs/attr.c b/fs/attr.c index 6530ced19697..55b46e3aa888 100644 --- a/fs/attr.c +++ b/fs/attr.c @@ -42,6 +42,17 @@ int inode_change_ok(const struct inode *inode, struct iattr *attr) return error; } + /* + * Verify that uid/gid changes are valid in the target namespace + * of the superblock. This cannot be overriden using ATTR_FORCE. + */ + if (ia_valid & ATTR_UID && + from_kuid(inode->i_sb->s_user_ns, attr->ia_uid) == (uid_t)-1) + return -EOVERFLOW; + if (ia_valid & ATTR_GID && + from_kgid(inode->i_sb->s_user_ns, attr->ia_gid) == (gid_t)-1) + return -EOVERFLOW; + /* If force is set do it anyway. */ if (ia_valid & ATTR_FORCE) return 0; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH v2 00/19] Support fuse mounts in user namespaces Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:30 +0100 [PATCH v2 15/18] fuse: Add support for pid namespaces Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:30 +0100 [PATCH v2 13/18] fs: Allow superblock owner to access do_remount_sb() Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:30 +0100 [PATCH v2 17/18] fuse: Restrict allow_other to the superblock's namespace or a descendant Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:30 +0100 [PATCH v2 10/18] fs: Update posix_acl support to handle user namespace mounts Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:30 +0100 [PATCH v2 04/18] selinux: Add support for unprivileged mounts from user namespaces Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:40 +0100 [PATCH v2 05/18] userns: Replace in_userns with current_in_userns Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:40 +0100 [PATCH v2 09/18] fs: Refuse uid/gid changes which don't map into s_user_ns Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:40 +0100 [PATCH v2 06/18] Smack: Handle labels consistently in untrusted mounts Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:40 +0100 [PATCH v2 01/18] block_dev: Support checking inode permissions in lookup_bdev() Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:40 +0100 [PATCH v2 02/18] block_dev: Check permissions towards block device inode when mounting Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:40 +0100
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