diff options
authorLinus Torvalds <torvalds@linux-foundation.org>2018-07-03 17:10:19 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-17 11:37:53 +0200
commitd2c7c52431819aa05d76fae77bb3f95dd0955da1 (patch)
parent16387eb51caa0828de1d78e605523a6d738a7f3f (diff)
Fix up non-directory creation in SGID directories
commit 0fa3ecd87848c9c93c2c828ef4c3a8ca36ce46c7 upstream. sgid directories have special semantics, making newly created files in the directory belong to the group of the directory, and newly created subdirectories will also become sgid. This is historically used for group-shared directories. But group directories writable by non-group members should not imply that such non-group members can magically join the group, so make sure to clear the sgid bit on non-directories for non-members (but remember that sgid without group execute means "mandatory locking", just to confuse things even more). Reported-by: Jann Horn <jannh@google.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/inode.c b/fs/inode.c
index 920aa0b1c6b0..2071ff5343c5 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2003,8 +2003,14 @@ void inode_init_owner(struct inode *inode, const struct inode *dir,
inode->i_uid = current_fsuid();
if (dir && dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
+ /* Directories are special, and always inherit S_ISGID */
if (S_ISDIR(mode))
mode |= S_ISGID;
+ else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
+ !in_group_p(inode->i_gid) &&
+ !capable_wrt_inode_uidgid(dir, CAP_FSETID))
+ mode &= ~S_ISGID;
} else
inode->i_gid = current_fsgid();
inode->i_mode = mode;