On Wed, 18 May 2016, Marc André Tanner <[email protected]> wrote:
> Independent of whether the functionality is desired, you probably want
> to implement it along the lines of:
>
> #ifndef __OpenBSD__
> int pledge(const char *promises, const char *paths[]) { return 0; }
> #endif
>
> This way you won't clutter all the call sites and they are at least
> compile tested on all platforms.
Excellent point, changed.
I can imagine most of pledge could be implemented on Linux using
SecComp... But that'd probably be bigger than dwm itself.
> Also because you always die upon failure you might want to introduce
> an xpledge(...) wrapper which could also print a more descriptive error
> message (pledging for which resource failed).
Like this is ok?
void
xpledge(const char *promises, const char *paths[])
{
if (pledge(promises, paths) < 0) {
perror("pledge");
die("dwm: tried to pledge: %s\n", promises);
}
}
Attached the new diff for dwm, I will modify the rest if this one looks
OK.
Thanks,
K.
diff --git a/dwm.c b/dwm.c
index ff7e096..950b813 100644
--- a/dwm.c
+++ b/dwm.c
@@ -57,6 +57,11 @@
#define TAGMASK ((1 << LENGTH(tags)) - 1)
#define TEXTW(X) (drw_text(drw, 0, 0, 0, 0, (X), 0) + drw->fonts[0]->h)
+/* portability */
+#ifndef __OpenBSD__
+int pledge(const char *promises, const char *paths[]) { return 0; }
+#endif
+
/* enums */
enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
enum { SchemeNorm, SchemeSel, SchemeLast }; /* color schemes */
@@ -232,6 +237,7 @@ static Monitor *wintomon(Window w);
static int xerror(Display *dpy, XErrorEvent *ee);
static int xerrordummy(Display *dpy, XErrorEvent *ee);
static int xerrorstart(Display *dpy, XErrorEvent *ee);
+static void xpledge(const char *promises, const char *paths[]);
static void zoom(const Arg *arg);
/* variables */
@@ -2112,6 +2118,15 @@ xerrorstart(Display *dpy, XErrorEvent *ee)
}
void
+xpledge(const char *promises, const char *paths[])
+{
+ if (pledge(promises, paths) < 0) {
+ perror("pledge");
+ die("dwm: tried to pledge: %s\n", promises);
+ }
+}
+
+void
zoom(const Arg *arg)
{
Client *c = selmon->sel;
@@ -2132,13 +2147,16 @@ main(int argc, char *argv[])
die("dwm-"VERSION "\n");
else if (argc != 1)
die("usage: dwm [-v]\n");
+ xpledge("stdio rpath dns unix prot_exec proc exec", NULL);
if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
fputs("warning: no locale support\n", stderr);
if (!(dpy = XOpenDisplay(NULL)))
die("dwm: cannot open display\n");
+ xpledge("stdio rpath prot_exec proc exec", NULL);
checkotherwm();
setup();
scan();
+ xpledge("stdio proc exec", NULL);
run();
cleanup();
XCloseDisplay(dpy);
