From: Etienne CHAMPETIER <champetier.etienne@gmail.com>
Date: Fri, 27 Nov 2015 16:27:16 +0000 (+0000)
Subject: ujail: add ELF interpreter (DT_INTERP) to the jail
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=6ffa138d4424dc1f1e05e8923a8d67c8394ac896;p=project%2Fprocd.git

ujail: add ELF interpreter (DT_INTERP) to the jail

this is needed by musl (openwrt DD)
uClibc/glibc is working without this

this partly fixes
https://dev.openwrt.org/ticket/20785

we still don't handle DT_RPATH, DT_RUNPATH, nodeflib, ...
see http://man7.org/linux/man-pages/man8/ld.so.8.html

Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>
---

diff --git a/jail/elf.c b/jail/elf.c
index 136789e..b8f2cc5 100644
--- a/jail/elf.c
+++ b/jail/elf.c
@@ -234,6 +234,7 @@ int elf_load_deps(const char *path, const char *map)
 {
 	unsigned int dyn_offset, dyn_size;
 	unsigned int load_offset, load_vaddr;
+	unsigned int interp_offset;
 
 	if (elf_find_section(map, PT_LOAD, &load_offset, NULL, &load_vaddr)) {
 		ERROR("failed to load the .load section from %s\n", path);
@@ -245,6 +246,10 @@ int elf_load_deps(const char *path, const char *map)
 		return -1;
 	}
 
+	if (elf_find_section(map, PT_INTERP, &interp_offset, NULL, NULL) == 0) {
+		add_path_and_deps(map+interp_offset, 1, -1, 0);
+	}
+
 	int clazz = map[EI_CLASS];
 
 	if (clazz == ELFCLASS32)