[PATCH 4.11 10/58] fs/exec.c: account for argv/envp pointers

4.11-stable review patch. If anyone has any objections, please let me know. -- From: Kees Cook commit 98da7d08850fb8bdeb395d6368ed15753304aa0c upstream. When limiting the argv/envp strings during exec to 1/4 of the stack limit, the storage of the

[PATCH 4.11 10/58] fs/exec.c: account for argv/envp pointers

4.11-stable review patch. If anyone has any objections, please let me know. -- From: Kees Cook commit 98da7d08850fb8bdeb395d6368ed15753304aa0c upstream. When limiting the argv/envp strings during exec to 1/4 of the stack limit, the storage of the pointers to the strings was