vfs: open() with O_CREAT should not create inodes with unknown ids
[ Upstream commit1328c72700
] may_create() rejects creation of inodes with ids which lack a mapping into s_user_ns. However for O_CREAT may_o_create() is is used instead. Add a similar check there. Fixes:036d523641
("vfs: Don't create inodes with a uid or gid unknown to the vfs") Signed-off-by: Seth Forshee <seth.forshee@canonical.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -2971,10 +2971,16 @@ static inline int open_to_namei_flags(int flag)
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static int may_o_create(const struct path *dir, struct dentry *dentry, umode_t mode)
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{
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struct user_namespace *s_user_ns;
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int error = security_path_mknod(dir, dentry, mode, 0);
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if (error)
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return error;
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s_user_ns = dir->dentry->d_sb->s_user_ns;
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if (!kuid_has_mapping(s_user_ns, current_fsuid()) ||
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!kgid_has_mapping(s_user_ns, current_fsgid()))
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return -EOVERFLOW;
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error = inode_permission(dir->dentry->d_inode, MAY_WRITE | MAY_EXEC);
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if (error)
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return error;
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