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llvm-project/lld/test/ELF/shuffle-sections-init-fini.s

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[ELF] Shuffle .init_array/.fini_array with --shuffle-sections= Useful for detecting static initialization order fiasco. Reviewed By: grimar Differential Revision: https://reviews.llvm.org/D74887
2020-02-20 15:14:49 +08:00
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
# RUN: ld.lld %t.o -o %t
# RUN: llvm-readelf -x .init -x .fini -x .init_array -x .fini_array %t | \
# RUN: FileCheck --check-prefixes=CHECK,ORDERED %s
# RUN: ld.lld %t.o --shuffle-sections=1 -o %t1
# RUN: llvm-readelf -x .init -x .fini -x .init_array -x .fini_array %t1 | \
# RUN: FileCheck --check-prefixes=CHECK,SHUFFLED %s
## .init and .fini rely on a particular order, e.g. crti.o crtbegin.o crtend.o crtn.o
## Don't shuffle them.
# CHECK: Hex dump of section '.init'
# CHECK-NEXT: 00010203 04050607 08090a0b
# CHECK: Hex dump of section '.fini'
# CHECK-NEXT: 00010203 04050607 08090a0b
## SHT_INIT_ARRAY/SHT_FINI_ARRAY with explicit priorities are still ordered.
# CHECK: Hex dump of section '.init_array'
# CHECK-NEXT: 0x{{[0-9a-f]+}} ff
# ORDERED-SAME: 000102 03040506 0708090a 0b
Add a llvm::shuffle and use it in lld With this --shuffle-sections=seed produces the same result in every host. Reviewed By: grimar, MaskRay Differential Revision: https://reviews.llvm.org/D74971
2020-02-23 01:51:02 +08:00
# SHUFFLED-SAME: 04000b 06010a08 09070203 05
[ELF] Shuffle .init_array/.fini_array with --shuffle-sections= Useful for detecting static initialization order fiasco. Reviewed By: grimar Differential Revision: https://reviews.llvm.org/D74887
2020-02-20 15:14:49 +08:00
# CHECK: Hex dump of section '.fini_array'
# CHECK-NEXT: 0x{{[0-9a-f]+}} ff
Add a llvm::shuffle and use it in lld With this --shuffle-sections=seed produces the same result in every host. Reviewed By: grimar, MaskRay Differential Revision: https://reviews.llvm.org/D74971
2020-02-23 01:51:02 +08:00
# ORDERED-SAME: 000102 03040506 0708090a 0b
# SHUFFLED-SAME: 090401 070b0003 080a0605 02
[ELF] Shuffle .init_array/.fini_array with --shuffle-sections= Useful for detecting static initialization order fiasco. Reviewed By: grimar Differential Revision: https://reviews.llvm.org/D74887
2020-02-20 15:14:49 +08:00
## With a SECTIONS command, SHT_INIT_ARRAY prirotities are ignored.
## All .init_array* are shuffled together.
[ELF] Keep orphan section names (.rodata.foo .text.foo) unchanged if !hasSectionsCommand This behavior matches GNU ld and seems reasonable. ``` // If a SECTIONS command is not specified .text.* -> .text .rodata.* -> .rodata .init_array.* -> .init_array ``` A proposed Linux feature CONFIG_FG_KASLR may depend on the GNU ld behavior. Reword a comment about -z keep-text-section-prefix and a comment about CommonSection (deleted by rL286234). Reviewed By: grimar Differential Revision: https://reviews.llvm.org/D75225
2020-02-26 10:00:13 +08:00
# RUN: echo 'SECTIONS { \
# RUN: .init_array : { *(.init_array*) } \
# RUN: .fini_array : { *(.fini_array*) }}' > %t.script
[ELF] Shuffle .init_array/.fini_array with --shuffle-sections= Useful for detecting static initialization order fiasco. Reviewed By: grimar Differential Revision: https://reviews.llvm.org/D74887
2020-02-20 15:14:49 +08:00
# RUN: ld.lld -T %t.script %t.o -o %t2
# RUN: llvm-readelf -x .init -x .fini -x .init_array -x .fini_array %t2 | \
# RUN: FileCheck --check-prefixes=CHECK2,ORDERED2 %s
# RUN: ld.lld -T %t.script %t.o --shuffle-sections=1 -o %t3
# RUN: llvm-readelf -x .init -x .fini -x .init_array -x .fini_array %t3 | \
# RUN: FileCheck --check-prefixes=CHECK2,SHUFFLED2 %s
# CHECK2: Hex dump of section '.init_array'
# ORDERED2-NEXT: 0x{{[0-9a-f]+}} 00010203 04050607 08090a0b ff
Add a llvm::shuffle and use it in lld With this --shuffle-sections=seed produces the same result in every host. Reviewed By: grimar, MaskRay Differential Revision: https://reviews.llvm.org/D74971
2020-02-23 01:51:02 +08:00
# SHUFFLED2-NEXT: 0x{{[0-9a-f]+}} 04000b06 010a0809 07ff0203 05
[ELF] Shuffle .init_array/.fini_array with --shuffle-sections= Useful for detecting static initialization order fiasco. Reviewed By: grimar Differential Revision: https://reviews.llvm.org/D74887
2020-02-20 15:14:49 +08:00
.irp i,0,1,2,3,4,5,6,7,8,9,10,11
.section .init,"ax",@progbits,unique,\i
.byte \i
.section .fini,"ax",@progbits,unique,\i
.byte \i
.section .init_array,"aw",@init_array,unique,\i
.byte \i
.section .fini_array,"aw",@fini_array,unique,\i
.byte \i
.endr
.section .init_array.1,"aw",@init_array
.byte 255
.section .fini_array.1,"aw",@fini_array
.byte 255