[hackers] [sbase] which: check AT_EACCESS || Mattias Andrée

[git]

commit 7315b8686f3fcbf213113247bea980b0548ec66a
Author:     Mattias Andrée <maand...@kth.se>
AuthorDate: Sat Jul 27 22:29:10 2019 +0200
Commit:     Michael Forney <mfor...@mforney.org>
CommitDate: Tue Jul 30 07:40:35 2019 -0700

    which: check AT_EACCESS
    
    A file is executable only if the effective user
    have permission to execute it. The real user's
    permissions do not matter.
    
    Signed-off-by: Mattias Andrée <maand...@kth.se>

diff --git a/which.c b/which.c
index 3f9af6e..abd030e 100644
--- a/which.c
+++ b/which.c
@@ -20,7 +20,7 @@ canexec(int fd, const char *name)
 
        if (fstatat(fd, name, &st, 0) < 0 || !S_ISREG(st.st_mode))
                return 0;
-       return faccessat(fd, name, X_OK, 0) == 0;
+       return faccessat(fd, name, X_OK, AT_EACCESS) == 0;
 }
 
 static int