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/*!A cross-platform build utility based on Lua
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright (C) 2015-present, Xmake Open Source Community.
*
* @author ruki
* @file rpath.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "rpath_elf"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* private implementation
*/
static tb_void_t xm_binutils_elf_add_rpaths(lua_State *lua, tb_char_t const* rpath, tb_size_t* pcount) {
if (!rpath || !*rpath) return;
tb_char_t path[TB_PATH_MAXN];
tb_char_t const* p = rpath;
tb_char_t const* e = tb_null;
while (*p) {
e = tb_strchr(p, ':');
tb_size_t n = e ? (tb_size_t)(e - p) : tb_strlen(p);
if (n > 0) {
if (n > sizeof(path) - 1) n = sizeof(path) - 1;
tb_strncpy(path, p, n);
path[n] = '\0';
lua_pushinteger(lua, *pcount + 1);
lua_pushstring(lua, path);
lua_settable(lua, -3);
(*pcount)++;
}
if (e) p = e + 1;
else break;
}
}
// parse .dynamic section and read DT_RPATH/DT_RUNPATH to build rpath list
static tb_bool_t xm_binutils_elf_rpath_list_impl(tb_stream_ref_t istream, tb_hize_t base_offset, xm_elf_context_t* ctx, lua_State *lua) {
tb_bool_t ok = tb_false;
do {
tb_uint32_t count = (tb_uint32_t)(ctx->dynamic_size / (ctx->is64 ? sizeof(xm_elf64_dynamic_t) : sizeof(xm_elf32_dynamic_t)));
if (!tb_stream_seek(istream, base_offset + ctx->dynamic_offset)) break;
tb_char_t rpath[8192] = {0};
tb_char_t runpath[8192] = {0};
// scan dynamic entries
for (tb_uint32_t i = 0; i < count; i++) {
tb_hize_t val = 0;
tb_hize_t tag = 0;
if (ctx->is64) {
xm_elf64_dynamic_t dyn;
if (!tb_stream_bread(istream, (tb_byte_t*)&dyn, sizeof(dyn))) break;
tag = dyn.d_tag;
val = dyn.d_un.d_val;
} else {
xm_elf32_dynamic_t dyn;
if (!tb_stream_bread(istream, (tb_byte_t*)&dyn, sizeof(dyn))) break;
tag = dyn.d_tag;
val = dyn.d_un.d_val;
}
if (tag == XM_ELF_DT_NULL) break;
// read rpath/runpath string from strtab
if (tag == XM_ELF_DT_RPATH) {
xm_binutils_read_string(istream, base_offset + ctx->strtab_offset + val, rpath, sizeof(rpath));
} else if (tag == XM_ELF_DT_RUNPATH) {
xm_binutils_read_string(istream, base_offset + ctx->strtab_offset + val, runpath, sizeof(runpath));
}
}
// split rpath(s) and push into Lua table
tb_size_t result_count = 0;
if (runpath[0]) {
xm_binutils_elf_add_rpaths(lua, runpath, &result_count);
} else if (rpath[0]) {
xm_binutils_elf_add_rpaths(lua, rpath, &result_count);
}
ok = tb_true;
} while (0);
return ok;
}
// remove DT_RPATH/DT_RUNPATH entries from .dynamic and write back
static tb_bool_t xm_binutils_elf_rpath_clean_impl(tb_stream_ref_t istream, tb_hize_t base_offset, xm_elf_context_t* ctx) {
tb_bool_t ok = tb_false;
tb_byte_t* buffer = tb_null;
do {
tb_uint32_t count = (tb_uint32_t)(ctx->dynamic_size / (ctx->is64 ? sizeof(xm_elf64_dynamic_t) : sizeof(xm_elf32_dynamic_t)));
// allocate buffer for all dynamic entries
tb_size_t dyn_size = (tb_size_t)ctx->dynamic_size;
buffer = (tb_byte_t*)tb_malloc(dyn_size);
if (!buffer) break;
if (!tb_stream_seek(istream, base_offset + ctx->dynamic_offset)) break;
if (!tb_stream_bread(istream, buffer, dyn_size)) break;
// p: read pointer, w: write pointer after filtering
tb_byte_t* p = buffer;
tb_byte_t* w = buffer;
tb_size_t entry_size = ctx->is64 ? sizeof(xm_elf64_dynamic_t) : sizeof(xm_elf32_dynamic_t);
for (tb_uint32_t i = 0; i < count; i++) {
tb_hize_t tag = 0;
if (ctx->is64) {
tag = ((xm_elf64_dynamic_t*)p)->d_tag;
} else {
tag = ((xm_elf32_dynamic_t*)p)->d_tag;
}
if (tag == XM_ELF_DT_NULL) {
// copy NULL entry and stop
tb_memcpy(w, p, entry_size);
w += entry_size;
p += entry_size;
break;
}
// keep entries except rpath/runpath
if (tag != XM_ELF_DT_RPATH && tag != XM_ELF_DT_RUNPATH) {
if (w != p) tb_memcpy(w, p, entry_size);
w += entry_size;
}
p += entry_size;
}
// fill remaining with NULLs
if (w < buffer + dyn_size) {
tb_memset(w, 0, (buffer + dyn_size) - w);
}
// write back
if (tb_stream_seek(istream, base_offset + ctx->dynamic_offset)) {
tb_stream_bwrit(istream, buffer, dyn_size);
}
ok = tb_true;
} while (0);
if (buffer) tb_free(buffer);
return ok;
}
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
tb_bool_t xm_binutils_elf_rpath_list(tb_stream_ref_t istream, tb_hize_t base_offset, lua_State *lua) {
tb_assert_and_check_return_val(istream && lua, tb_false);
tb_bool_t ok = tb_false;
do {
// read ident
tb_byte_t ident[16];
if (!tb_stream_seek(istream, base_offset)) break;
if (!tb_stream_bread(istream, ident, sizeof(ident))) break;
// build ELF context (dynamic, strtab offsets)
xm_elf_context_t ctx;
if (ident[XM_ELF_EI_CLASS] == XM_ELF_CLASS32) {
if (xm_binutils_elf_get_context_32(istream, base_offset, &ctx)) {
if (xm_binutils_elf_rpath_list_impl(istream, base_offset, &ctx, lua)) ok = tb_true;
}
} else if (ident[XM_ELF_EI_CLASS] == XM_ELF_CLASS64) {
if (xm_binutils_elf_get_context_64(istream, base_offset, &ctx)) {
if (xm_binutils_elf_rpath_list_impl(istream, base_offset, &ctx, lua)) ok = tb_true;
}
}
} while (0);
return ok;
}
tb_bool_t xm_binutils_elf_rpath_clean(tb_stream_ref_t istream, tb_hize_t base_offset) {
tb_assert_and_check_return_val(istream, tb_false);
tb_bool_t ok = tb_false;
do {
// read ident
tb_byte_t ident[16];
if (!tb_stream_seek(istream, base_offset)) break;
if (!tb_stream_bread(istream, ident, sizeof(ident))) break;
/* build ELF context to locate the .dynamic section
*
* @note we only need dynamic_offset/dynamic_size here (strtab is not used
* when removing entries by tag), so we do not require get_context to fully succeed.
*/
xm_elf_context_t ctx;
tb_memset(&ctx, 0, sizeof(ctx));
if (ident[XM_ELF_EI_CLASS] == XM_ELF_CLASS32) {
xm_binutils_elf_get_context_32(istream, base_offset, &ctx);
} else if (ident[XM_ELF_EI_CLASS] == XM_ELF_CLASS64) {
xm_binutils_elf_get_context_64(istream, base_offset, &ctx);
} else {
break;
}
/* no .dynamic section? e.g. a fully static executable (-static),
* there is no rpath/runpath to clean, so just treat it as a no-op success.
*
* @see https://github.com/xmake-io/xmake/issues/7595
*/
if (ctx.dynamic_offset == 0 || ctx.dynamic_size == 0) {
ok = tb_true;
break;
}
// remove DT_RPATH/DT_RUNPATH entries
ok = xm_binutils_elf_rpath_clean_impl(istream, base_offset, &ctx);
} while (0);
return ok;
}
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