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96 lines
3.3 KiB
Diff
96 lines
3.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Dmitry Muhomor <muhomor.dmitry@gmail.com>
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Date: Tue, 2 May 2023 16:45:26 +0300
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Subject: [PATCH] support assigning ID to path of current executable
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---
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libc/bionic/libc_init_dynamic.cpp | 27 ++++++++++++++++++++++++++-
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libc/include/stdlib.h | 3 +++
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libc/libc.map.txt | 1 +
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libc/private/bionic_globals.h | 1 +
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4 files changed, 31 insertions(+), 1 deletion(-)
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diff --git a/libc/bionic/libc_init_dynamic.cpp b/libc/bionic/libc_init_dynamic.cpp
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index c61810e34..804e586e2 100644
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--- a/libc/bionic/libc_init_dynamic.cpp
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+++ b/libc/bionic/libc_init_dynamic.cpp
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@@ -72,6 +72,28 @@ extern "C" __attribute__((weak)) void __hwasan_library_unloaded(ElfW(Addr) base,
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const ElfW(Phdr)* phdr,
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ElfW(Half) phnum);
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+static void init_prog_id(libc_globals* globals) {
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+ char exe_path[500];
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+ ssize_t readlink_res = readlink("/proc/self/exe", exe_path, sizeof(exe_path) - 1 /* space for NUL terminator */);
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+ if (readlink_res <= 0) {
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+ return;
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+ }
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+ exe_path[readlink_res] = '\0';
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+
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+ int prog_id = 0;
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+
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+#define IS(prog) (!strcmp(exe_path, prog))
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+
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+#undef IS
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+
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+ // libc_globals struct is write-protected
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+ globals->prog_id = prog_id;
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+}
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+
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+int get_prog_id() {
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+ return __libc_globals->prog_id;
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+}
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+
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// We need a helper function for __libc_preinit because compiling with LTO may
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// inline functions requiring a stack protector check, but __stack_chk_guard is
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// not initialized at the start of __libc_preinit. __libc_preinit_impl will run
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@@ -103,7 +125,10 @@ static void __libc_preinit_impl() {
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#endif
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// Hooks for various libraries to let them know that we're starting up.
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- __libc_globals.mutate(__libc_init_malloc);
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+ __libc_globals.mutate([](libc_globals* globals) {
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+ init_prog_id(globals);
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+ __libc_init_malloc(globals);
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+ });
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// Install reserved signal handlers for assisting the platform's profilers.
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__libc_init_profiling_handlers();
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diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
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index 2830a493d..5ce8f9103 100644
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--- a/libc/include/stdlib.h
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+++ b/libc/include/stdlib.h
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@@ -210,6 +210,9 @@ long strtol_l(const char* _Nonnull __s, char* _Nullable * _Nullable __end_ptr, i
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// Implemented as static inlines before 26.
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#endif
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+int get_prog_id();
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+#define is_prog(id) (get_prog_id() == id)
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+
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__END_DECLS
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#include <android/legacy_stdlib_inlines.h>
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diff --git a/libc/libc.map.txt b/libc/libc.map.txt
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index 156e9ee32..5d87cd8ef 100644
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--- a/libc/libc.map.txt
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+++ b/libc/libc.map.txt
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@@ -420,6 +420,7 @@ LIBC {
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get_nprocs; # introduced=23
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get_nprocs_conf; # introduced=23
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get_phys_pages; # introduced=23
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+ get_prog_id;
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getaddrinfo;
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getauxval; # introduced-arm=18 introduced-arm64=21 introduced-x86=18 introduced-x86_64=21
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getc;
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diff --git a/libc/private/bionic_globals.h b/libc/private/bionic_globals.h
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index 8ea7d4d66..66f8d84b0 100644
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--- a/libc/private/bionic_globals.h
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+++ b/libc/private/bionic_globals.h
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@@ -65,6 +65,7 @@ struct libc_globals {
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// limit is enabled and some other hook is enabled at the same time.
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_Atomic(const MallocDispatch*) default_dispatch_table;
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MallocDispatch malloc_dispatch_table;
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+ int prog_id;
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};
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struct memtag_dynamic_entries_t {
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