The Tor Browser: build/unix/elfhack/inject.c@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #include <stdint.h>

     6 #include <elf.h>

     8 /* The Android NDK headers define those */

     9 #undef Elf_Ehdr

    10 #undef Elf_Addr

    12 #if defined(__LP64__)

    13 #define Elf_Ehdr Elf64_Ehdr

    14 #define Elf_Addr Elf64_Addr

    15 #else

    16 #define Elf_Ehdr Elf32_Ehdr

    17 #define Elf_Addr Elf32_Addr

    18 #endif

    20 extern __attribute__((visibility("hidden"))) void original_init(int argc, char **argv, char **env);

    22 extern __attribute__((visibility("hidden"))) Elf32_Rel relhack[];

    23 extern __attribute__((visibility("hidden"))) Elf_Ehdr elf_header;

    25 static inline __attribute__((always_inline))

    26 void do_relocations(void)

    27 {

    28     Elf32_Rel *rel;

    29     Elf_Addr *ptr, *start;

    30     for (rel = relhack; rel->r_offset; rel++) {

    31         start = (Elf_Addr *)((intptr_t)&elf_header + rel->r_offset);

    32         for (ptr = start; ptr < &start[rel->r_info]; ptr++)

    33             *ptr += (intptr_t)&elf_header;

    34     }

    35 }

    37 __attribute__((section(".text._init_noinit")))

    38 int init_noinit(int argc, char **argv, char **env)

    39 {

    40     do_relocations();

    41     return 0;

    42 }

    44 __attribute__((section(".text._init")))

    45 int init(int argc, char **argv, char **env)

    46 {

    47     do_relocations();

    48     original_init(argc, argv, env);

    49     // Ensure there is no tail-call optimization, avoiding the use of the

    50     // B.W instruction in Thumb for the call above.

    51     return 0;

    52 }

The Tor Browser / file revision