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[Patch] Updated version of emutramp_enabled_check() for PaX kernels
- From: Magnus Granberg <zorry at gentoo dot org>
- To: libffi-discuss at sourceware dot org
- Date: Mon, 29 Apr 2013 23:44:27 +0200
- Subject: [Patch] Updated version of emutramp_enabled_check() for PaX kernels
Hi
This patch check the PaX status in /proc/self/status
and it will return true or fales depend on the status of
emulate trampolines in Pax.
/Magnus
2013-04-29 Magnus Granberg <zorry@gentoo.org>
* src/cloures.c (emutramp_enabled_check): Check /proc/self/status for PaX
status.
--- a/src/closures.c 2013-03-17 23:27:11.000000000 +0100
+++ b/src/closures.c 2013-04-29 23:26:02.279022022 +0200
@@ -181,10 +181,26 @@ static int emutramp_enabled = -1;
static int
emutramp_enabled_check (void)
{
- if (getenv ("FFI_DISABLE_EMUTRAMP") == NULL)
- return 1;
- else
+ char *buf = NULL;
+ size_t len = 0;
+ FILE *f;
+ int ret;
+ f = fopen ("/proc/self/status", "r");
+ if (f == NULL)
return 0;
+ ret = 0;
+
+ while (getline (&buf, &len, f) != -1)
+ if (!strncmp (buf, "PaX:", 4))
+ {
+ char emutramp;
+ if (sscanf (buf, "%*s %*c%c", &emutramp) == 1)
+ ret = (emutramp == 'E');
+ break;
+ }
+ free (buf);
+ fclose (f);
+ return ret;
}
#define is_emutramp_enabled() (emutramp_enabled >= 0 ? emutramp_enabled \