I guess I can just put this up. Most of these have been sitting here forever.

memwr.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#define BUFSZ 8192
+
+int main( int argc, char** argv )
+{
+	if ( argc < 3 )
+	{
+		fputs("usage: memwrite <pid> <offset> <size>\n",stderr);
+		return 1;
+	}
+	char fn[256];
+	snprintf(fn,256,"/proc/%s/mem",argv[1]);
+	int fd = open(fn,O_WRONLY);
+	if ( !fd )
+	{
+		perror("could not open process");
+		return 2;
+	}
+	off_t memofs = 0;
+	off_t siz = 0, srd;
+	sscanf(argv[2],"%llx",&memofs);
+	sscanf(argv[3],"%lld",&siz);
+	lseek(fd,memofs,SEEK_SET);
+	unsigned char buf[BUFSZ];
+	while ( siz > 0 )
+	{
+		srd = read(0,buf,(siz>BUFSZ)?BUFSZ:siz);
+		write(fd,buf,srd);
+		siz -= srd;
+	}
+	close(fd);
+	return 0;
+}