Merge 4.14.56 into android-4.14

[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / fs / inode.c

diff --git a/fs/inode.c b/fs/inode.c
index 2ab80655dc1989679093a42c0ac1ca99949e7a0d..602e28f0c762b28514dcae9fd704c6b277a8fbce 100644 (file)
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2006,8 +2006,14 @@ 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;