[libc-commits] [libc] [libc] move __stack_chk_fail to src/ from startup/ (PR #75863)
via libc-commits
libc-commits at lists.llvm.org
Mon Dec 18 13:55:09 PST 2023
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-libc
Author: Nick Desaulniers (nickdesaulniers)
<details>
<summary>Changes</summary>
__stack_chk_fail should be provided by libc.a, not startup files.
Add __stack_chk_fail to existing linux and arm entrypoints. On Windows (when
not targeting MinGW), it seems that the corresponding function identifier is
__security_check_cookie, so no entrypoint is added for Windows. Baremetal
targets also ought to be compileable with `-fstack-protector*`
There is no common header for this prototype, since calls to __stack_chk_fail
are meant to be inserted by the compiler upon function return when compiled
`-fstack-protector*`.
---
Full diff: https://github.com/llvm/llvm-project/pull/75863.diff
11 Files Affected:
- (modified) libc/config/baremetal/arm/entrypoints.txt (+4-1)
- (modified) libc/config/baremetal/riscv/entrypoints.txt (+3)
- (modified) libc/config/linux/aarch64/entrypoints.txt (+5-2)
- (modified) libc/config/linux/arm/entrypoints.txt (+2-2)
- (modified) libc/config/linux/riscv/entrypoints.txt (+3)
- (modified) libc/config/linux/x86_64/entrypoints.txt (+3)
- (modified) libc/src/CMakeLists.txt (+2-1)
- (added) libc/src/compiler/CMakeLists.txt (+18)
- (added) libc/src/compiler/generic/CMakeLists.txt (+11)
- (added) libc/src/compiler/generic/__stack_chk_fail.cpp (+21)
- (modified) libc/startup/linux/x86_64/start.cpp (-5)
``````````diff
diff --git a/libc/config/baremetal/arm/entrypoints.txt b/libc/config/baremetal/arm/entrypoints.txt
index a88b7aa749e565..a0779c41652aeb 100644
--- a/libc/config/baremetal/arm/entrypoints.txt
+++ b/libc/config/baremetal/arm/entrypoints.txt
@@ -17,6 +17,9 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.ctype.tolower
libc.src.ctype.toupper
+ # compiler entrypoints (no corresponding header)
+ libc.src.compiler.__stack_chk_fail
+
# errno.h entrypoints
libc.src.errno.errno
@@ -69,7 +72,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.stdio.snprintf
libc.src.stdio.vsprintf
libc.src.stdio.vsnprintf
-
+
# stdlib.h entrypoints
libc.src.stdlib.abs
libc.src.stdlib.atoi
diff --git a/libc/config/baremetal/riscv/entrypoints.txt b/libc/config/baremetal/riscv/entrypoints.txt
index 3b7ca513eb0965..3e15cc8901bddf 100644
--- a/libc/config/baremetal/riscv/entrypoints.txt
+++ b/libc/config/baremetal/riscv/entrypoints.txt
@@ -17,6 +17,9 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.ctype.tolower
libc.src.ctype.toupper
+ # compiler entrypoints (no corresponding header)
+ libc.src.compiler.__stack_chk_fail
+
# errno.h entrypoints
libc.src.errno.errno
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 60e0e2b29aed36..77c9a50b8b7e5d 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -16,7 +16,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.ctype.toascii
libc.src.ctype.tolower
libc.src.ctype.toupper
-
+
# errno.h entrypoints
libc.src.errno.errno
@@ -239,7 +239,7 @@ set(TARGET_LIBM_ENTRYPOINTS
libc.src.math.asinf
libc.src.math.asinhf
libc.src.math.atanf
- libc.src.math.atanhf
+ libc.src.math.atanhf
libc.src.math.copysign
libc.src.math.copysignf
libc.src.math.copysignl
@@ -353,6 +353,9 @@ set(TARGET_LIBM_ENTRYPOINTS
if(LLVM_LIBC_FULL_BUILD)
list(APPEND TARGET_LIBC_ENTRYPOINTS
+ # compiler entrypoints (no corresponding header)
+ libc.src.compiler.__stack_chk_fail
+
# network.h entrypoints
libc.src.network.htonl
libc.src.network.htons
diff --git a/libc/config/linux/arm/entrypoints.txt b/libc/config/linux/arm/entrypoints.txt
index 123c7e33377ad1..274d5aa5a0057d 100644
--- a/libc/config/linux/arm/entrypoints.txt
+++ b/libc/config/linux/arm/entrypoints.txt
@@ -66,7 +66,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.inttypes.imaxdiv
libc.src.inttypes.strtoimax
libc.src.inttypes.strtoumax
-
+
# stdlib.h entrypoints
libc.src.stdlib.abs
libc.src.stdlib.atoi
@@ -88,7 +88,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.stdlib.strtoll
libc.src.stdlib.strtoul
libc.src.stdlib.strtoull
-
+
# sys/mman.h entrypoints
libc.src.sys.mman.mmap
libc.src.sys.mman.munmap
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index 948708e35f45d2..e389936ffca1ef 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -362,6 +362,9 @@ set(TARGET_LIBM_ENTRYPOINTS
if(LLVM_LIBC_FULL_BUILD)
list(APPEND TARGET_LIBC_ENTRYPOINTS
+ # compiler entrypoints (no corresponding header)
+ libc.src.compiler.__stack_chk_fail
+
# assert.h entrypoints
libc.src.assert.__assert_fail
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 1c93063e25e90c..3adcd57d0c0849 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -375,6 +375,9 @@ if(LLVM_LIBC_FULL_BUILD)
# assert.h entrypoints
libc.src.assert.__assert_fail
+ # compiler entrypoints (no corresponding header)
+ libc.src.compiler.__stack_chk_fail
+
# dirent.h entrypoints
libc.src.dirent.closedir
libc.src.dirent.dirfd
diff --git a/libc/src/CMakeLists.txt b/libc/src/CMakeLists.txt
index 3ab62a4f667d26..492f9c5bd50f9b 100644
--- a/libc/src/CMakeLists.txt
+++ b/libc/src/CMakeLists.txt
@@ -29,10 +29,11 @@ if(NOT LLVM_LIBC_FULL_BUILD)
endif()
add_subdirectory(assert)
+add_subdirectory(compiler)
add_subdirectory(network)
+add_subdirectory(search)
add_subdirectory(setjmp)
add_subdirectory(signal)
add_subdirectory(spawn)
add_subdirectory(threads)
add_subdirectory(time)
-add_subdirectory(search)
diff --git a/libc/src/compiler/CMakeLists.txt b/libc/src/compiler/CMakeLists.txt
new file mode 100644
index 00000000000000..aa59d84e08d146
--- /dev/null
+++ b/libc/src/compiler/CMakeLists.txt
@@ -0,0 +1,18 @@
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
+ add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
+else()
+ add_subdirectory(generic)
+endif()
+
+if(TARGET libc.src.compiler.${LIBC_TARGET_OS}.__stack_chk_fail)
+ set(stack_chk_fail_dep libc.src.compiler.${LIBC_TARGET_OS}.__stack_chk_fail)
+else()
+ set(stack_chk_fail_dep libc.src.compiler.generic.__stack_chk_fail)
+endif()
+
+add_entrypoint_object(
+ __stack_chk_fail
+ ALIAS
+ DEPENDS
+ ${stack_chk_fail_dep}
+)
diff --git a/libc/src/compiler/generic/CMakeLists.txt b/libc/src/compiler/generic/CMakeLists.txt
new file mode 100644
index 00000000000000..0d869b72a12cf5
--- /dev/null
+++ b/libc/src/compiler/generic/CMakeLists.txt
@@ -0,0 +1,11 @@
+add_entrypoint_object(
+ __stack_chk_fail
+ SRCS
+ __stack_chk_fail.cpp
+ HDRS
+ ../__stack_chk_fail.h
+ DEPENDS
+ libc.include.assert
+ libc.src.__support.OSUtil.osutil
+ libc.src.stdlib.abort
+)
diff --git a/libc/src/compiler/generic/__stack_chk_fail.cpp b/libc/src/compiler/generic/__stack_chk_fail.cpp
new file mode 100644
index 00000000000000..076ed351e5fe0c
--- /dev/null
+++ b/libc/src/compiler/generic/__stack_chk_fail.cpp
@@ -0,0 +1,21 @@
+//===-- Implementation of __stack_chk_fail --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/compiler/__stack_chk_fail.h"
+#include "src/__support/OSUtil/io.h"
+#include "src/stdlib/abort.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(void, __stack_chk_fail, (void)) {
+ LIBC_NAMESPACE::write_to_stderr("stack smashing detected");
+ LIBC_NAMESPACE::abort();
+}
+
+} // namespace LIBC_NAMESPACE
+
diff --git a/libc/startup/linux/x86_64/start.cpp b/libc/startup/linux/x86_64/start.cpp
index 496105dfd0b43a..c7d931d763a46f 100644
--- a/libc/startup/linux/x86_64/start.cpp
+++ b/libc/startup/linux/x86_64/start.cpp
@@ -25,11 +25,6 @@
extern "C" int main(int, char **, char **);
-extern "C" void __stack_chk_fail() {
- LIBC_NAMESPACE::write_to_stderr("stack smashing detected");
- LIBC_NAMESPACE::abort();
-}
-
namespace LIBC_NAMESPACE {
#ifdef SYS_mmap2
``````````
</details>
https://github.com/llvm/llvm-project/pull/75863
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