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LibC: Use uintptr_t for __stack_chk_guard

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We used size_t, which is a type that is guarenteed to be large
enough to hold an array index, but uintptr_t is designed to be used
to hold pointer values, which is the case of stack guards.
This commit is contained in:
Keegan Saunders 2022-11-26 13:17:32 -05:00 committed by Andreas Kling
parent 675e5bfdce
commit 89b23c473a
Notes: sideshowbarker 2024-07-19 17:01:48 +09:00 
Author: https://github.com/meme 🔰
Commit: https://github.com/SerenityOS/serenity/commit/89b23c473a5
Pull-request: https://github.com/SerenityOS/serenity/pull/16230
6 changed files with 11 additions and 11 deletions
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4
Kernel/Arch/aarch64/init.cpp
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@ -65,8 +65,8 @@ extern ctor_func_t start_ctors[];
extern ctor_func_t end_ctors[];
// FIXME: Share this with the Intel Prekernel.
extern size_t __stack_chk_guard;
size_t __stack_chk_guard;
extern uintptr_t __stack_chk_guard;
uintptr_t __stack_chk_guard;
READONLY_AFTER_INIT bool g_in_early_boot;

6
Kernel/Arch/x86/init.cpp
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@ -68,8 +68,8 @@ extern ctor_func_t end_heap_ctors[];
extern ctor_func_t start_ctors[];
extern ctor_func_t end_ctors[];
extern size_t __stack_chk_guard;
READONLY_AFTER_INIT size_t __stack_chk_guard __attribute__((used));
extern uintptr_t __stack_chk_guard;
READONLY_AFTER_INIT uintptr_t __stack_chk_guard __attribute__((used));
extern "C" u8 start_of_safemem_text[];
extern "C" u8 end_of_safemem_text[];
@ -234,7 +234,7 @@ extern "C" [[noreturn]] UNMAP_AFTER_INIT void init(BootInfo const& boot_info)
// Initialize TimeManagement before using randomness!
TimeManagement::initialize(0);
__stack_chk_guard = get_fast_random<size_t>();
__stack_chk_guard = get_fast_random<uintptr_t>();
ProcFSComponentRegistry::initialize();
JailManagement::the();

4
Kernel/Prekernel/init.cpp
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@ -20,8 +20,8 @@
#endif
// Defined in the linker script
extern size_t __stack_chk_guard;
size_t __stack_chk_guard __attribute__((used));
extern uintptr_t __stack_chk_guard;
uintptr_t __stack_chk_guard __attribute__((used));
extern "C" [[noreturn]] void __stack_chk_fail();
extern "C" u8 start_of_prekernel_image[];

2
Userland/Libraries/LibC/crt0.cpp
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@ -14,7 +14,7 @@
#ifndef _DYNAMIC_LOADER
extern "C" {
extern size_t __stack_chk_guard;
extern uintptr_t __stack_chk_guard;
extern bool s_global_initializers_ran;
int main(int, char**, char**);

4
Userland/Libraries/LibC/ssp.cpp
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@ -17,8 +17,8 @@
extern "C" {
extern size_t __stack_chk_guard;
__attribute__((used)) size_t __stack_chk_guard = (size_t)0xc6c7c8c9;
extern uintptr_t __stack_chk_guard;
__attribute__((used)) uintptr_t __stack_chk_guard = (uintptr_t)0xc6c7c8c9;
__attribute__((noreturn)) void __stack_chk_fail()
{

2
Userland/Libraries/LibELF/DynamicLinker.cpp
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@ -258,7 +258,7 @@ static void initialize_libc(DynamicObject& libc)
// This is not done in __libc_init, as we definitely have to return from that, and it might affect Loader as well.
res = libc.lookup_symbol("__stack_chk_guard"sv);
VERIFY(res.has_value());
arc4random_buf(res.value().address.as_ptr(), sizeof(size_t));
arc4random_buf(res.value().address.as_ptr(), sizeof(uintptr_t));
res = libc.lookup_symbol("__environ_is_malloced"sv);
VERIFY(res.has_value());