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llvm-project/clang/test/CodeGen/asan-globals-alias.cpp

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[ASan][Test] Split out global alias test Some platforms do not support aliases. Split the test, and pass explicit triple to avoid test failure. Reviewed By: thakis Tags: #clang Differential Revision: https://reviews.llvm.org/D81591
2020-06-11 01:55:51 +08:00
// RUN: %clang_cc1 -triple x86_64-linux -fsanitize=address -emit-llvm -o - %s | FileCheck %s --check-prefixes=CHECK,ASAN
[KernelAddressSanitizer] Fix globals exclusion for indirect aliases GlobalAlias::getAliasee() may not always point directly to a GlobalVariable. In such cases, try to find the canonical GlobalVariable that the alias refers to. Link: https://github.com/ClangBuiltLinux/linux/issues/1208 Reviewed By: dvyukov, nickdesaulniers Differential Revision: https://reviews.llvm.org/D92846
2020-12-11 19:20:40 +08:00
// RUN: %clang_cc1 -triple x86_64-linux -O2 -fsanitize=address -emit-llvm -o - %s | FileCheck %s --check-prefixes=CHECK,ASAN
[ASan][Test] Split out global alias test Some platforms do not support aliases. Split the test, and pass explicit triple to avoid test failure. Reviewed By: thakis Tags: #clang Differential Revision: https://reviews.llvm.org/D81591
2020-06-11 01:55:51 +08:00
// RUN: %clang_cc1 -triple x86_64-linux -fsanitize=kernel-address -emit-llvm -o - %s | FileCheck %s --check-prefixes=CHECK,KASAN
[KernelAddressSanitizer] Fix globals exclusion for indirect aliases GlobalAlias::getAliasee() may not always point directly to a GlobalVariable. In such cases, try to find the canonical GlobalVariable that the alias refers to. Link: https://github.com/ClangBuiltLinux/linux/issues/1208 Reviewed By: dvyukov, nickdesaulniers Differential Revision: https://reviews.llvm.org/D92846
2020-12-11 19:20:40 +08:00
// RUN: %clang_cc1 -triple x86_64-linux -O2 -fsanitize=kernel-address -emit-llvm -o - %s | FileCheck %s --check-prefixes=CHECK,KASAN
[ASan][Test] Split out global alias test Some platforms do not support aliases. Split the test, and pass explicit triple to avoid test failure. Reviewed By: thakis Tags: #clang Differential Revision: https://reviews.llvm.org/D81591
2020-06-11 01:55:51 +08:00
//
// Not all platforms support aliases - test for Linux only.
[KernelAddressSanitizer] Fix globals exclusion for indirect aliases GlobalAlias::getAliasee() may not always point directly to a GlobalVariable. In such cases, try to find the canonical GlobalVariable that the alias refers to. Link: https://github.com/ClangBuiltLinux/linux/issues/1208 Reviewed By: dvyukov, nickdesaulniers Differential Revision: https://reviews.llvm.org/D92846
2020-12-11 19:20:40 +08:00
int global; // generate ctor for at least 1 global
int aliased_global; // KASAN ignored
extern int __attribute__((alias("aliased_global"))) __global_alias;
// Recursive alias:
int aliased_global_2; // KASAN ignored
extern int __attribute__((alias("aliased_global_2"))) global_alias_2;
extern int __attribute__((alias("global_alias_2"))) __global_alias_2_alias;
// Potential indirect alias:
struct input_device_id {
unsigned long keybit[24];
unsigned long driver_info;
};
struct input_device_id joydev_ids[] = { { {1}, 1234 } }; // KASAN ignored
extern struct input_device_id __attribute__((alias("joydev_ids"))) __mod_joydev_ids_device_table;
[ASan][Test] Split out global alias test Some platforms do not support aliases. Split the test, and pass explicit triple to avoid test failure. Reviewed By: thakis Tags: #clang Differential Revision: https://reviews.llvm.org/D81591
2020-06-11 01:55:51 +08:00
[sanitizer] Reduce redzone size for small size global objects Currently 1 byte global object has a ridiculous 63 bytes redzone. This patch reduces the redzone size to be less than 32 if the size of global object is less than or equal to half of 32 (the minimal size of redzone). A 12 bytes object has a 20 bytes redzone, a 20 bytes object has a 44 bytes redzone. Reviewed By: MaskRay, #sanitizers, vitalybuka Differential Revision: https://reviews.llvm.org/D102469
2021-05-20 10:18:49 +08:00
// ASAN: @aliased_global{{.*}} global { i32, [28 x i8] }{{.*}}, align 32
// ASAN: @aliased_global_2{{.*}} global { i32, [28 x i8] }{{.*}}, align 32
[KernelAddressSanitizer] Fix globals exclusion for indirect aliases GlobalAlias::getAliasee() may not always point directly to a GlobalVariable. In such cases, try to find the canonical GlobalVariable that the alias refers to. Link: https://github.com/ClangBuiltLinux/linux/issues/1208 Reviewed By: dvyukov, nickdesaulniers Differential Revision: https://reviews.llvm.org/D92846
2020-12-11 19:20:40 +08:00
// ASAN: @joydev_ids{{.*}} global { {{.*}}[56 x i8] zeroinitializer }, align 32
[ASan][Test] Fix expected strings for globals test The expected strings would previously not catch bugs when redzones were added when they were not actually expected. Fix by adding "global " before the type.
2020-06-11 02:20:23 +08:00
// KASAN: @aliased_global{{.*}} global i32
[KernelAddressSanitizer] Fix globals exclusion for indirect aliases GlobalAlias::getAliasee() may not always point directly to a GlobalVariable. In such cases, try to find the canonical GlobalVariable that the alias refers to. Link: https://github.com/ClangBuiltLinux/linux/issues/1208 Reviewed By: dvyukov, nickdesaulniers Differential Revision: https://reviews.llvm.org/D92846
2020-12-11 19:20:40 +08:00
// KASAN: @aliased_global_2{{.*}} global i32
// KASAN: @joydev_ids{{.*}} global [1 x {{.*}}i64 1234 }], align 16
// Check the aliases exist:
[test] Add {{.*}} to make ELF tests immune to dso_local/dso_preemptable/(none) differences For a default visibility external linkage definition, dso_local is set for ELF -fno-pic/-fpie and COFF and Mach-O. Since default clang -cc1 for ELF is similar to -fpic ("PIC Level" is not set), this nuance causes unneeded binary format differences. To make emitted IR similar, ELF -cc1 -fpic will default to -fno-semantic-interposition, which sets dso_local for default visibility external linkage definitions. To make this flip smooth and enable future (dso_local as definition default), this patch replaces (function) `define ` with `define{{.*}} `, (variable/constant/alias) `= ` with `={{.*}} `, or inserts appropriate `{{.*}} `.
2020-12-31 16:27:11 +08:00
// CHECK: @__global_alias ={{.*}} alias
// CHECK: @global_alias_2 ={{.*}} alias
// CHECK: @__global_alias_2_alias ={{.*}} alias
// CHECK: @__mod_joydev_ids_device_table ={{.*}} alias
[ASan][Test] Split out global alias test Some platforms do not support aliases. Split the test, and pass explicit triple to avoid test failure. Reviewed By: thakis Tags: #clang Differential Revision: https://reviews.llvm.org/D81591
2020-06-11 01:55:51 +08:00
// CHECK-LABEL: define internal void @asan.module_ctor
[KernelAddressSanitizer] Fix globals exclusion for indirect aliases GlobalAlias::getAliasee() may not always point directly to a GlobalVariable. In such cases, try to find the canonical GlobalVariable that the alias refers to. Link: https://github.com/ClangBuiltLinux/linux/issues/1208 Reviewed By: dvyukov, nickdesaulniers Differential Revision: https://reviews.llvm.org/D92846
2020-12-11 19:20:40 +08:00
// ASAN: call void @__asan_register_globals({{.*}}, i{{32|64}} 4)
[ASan][Test] Split out global alias test Some platforms do not support aliases. Split the test, and pass explicit triple to avoid test failure. Reviewed By: thakis Tags: #clang Differential Revision: https://reviews.llvm.org/D81591
2020-06-11 01:55:51 +08:00
// KASAN: call void @__asan_register_globals({{.*}}, i{{32|64}} 1)
// CHECK-NEXT: ret void
// CHECK-LABEL: define internal void @asan.module_dtor
// CHECK-NEXT: call void @__asan_unregister_globals
// CHECK-NEXT: ret void