[uClibc] [PATCH] ld.so mprotect rwx .dyanmic segment for mips DT_DEBUG
Bradley D. LaRonde
brad at laronde.org
Wed May 12 22:56:39 UTC 2004
--- uClibc/ldso/ldso/dl-startup.c.orig 2004-05-11 07:14:58.000000000 -0400
+++ uClibc/ldso/ldso/dl-startup.c 2004-05-12 18:50:43.000000000 -0400
@@ -377,13 +377,18 @@
}
app_tpnt->dynamic_info[dpnt->d_tag] = dpnt->d_un.d_val;
-#warning "Debugging threads on mips won't work till someone fixes this..."
-#if 0
if (dpnt->d_tag == DT_DEBUG) {
+ /* Allow writing debug_addr into the .dynamic segment.
+ * Even though the program header is marked RWE, the kernel gives
+ * it to us rx.
+ */
+ Elf32_Addr mpa = (ppnt->p_vaddr + app_tpnt->loadaddr) & ~(_dl_pagesize - 1);
+ if(_dl_mprotect(mpa, ppnt->p_memsz, PROT_READ | PROT_WRITE | PROT_EXEC)) {
+ SEND_STDERR("Couldn't mprotect .dynamic segment to rwx.\n");
+ _dl_exit(0);
+ }
dpnt->d_un.d_val = (unsigned long) debug_addr;
}
-#endif
-
#else
if (dpnt->d_tag > DT_JMPREL) {
dpnt++;
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