af47d0021c
Reported at https://reviews.llvm.org/D64930#1642223 If the only section of a PT_LOAD is a SHT_NOBITS section (e.g. .bss), we may not align its sh_offset. p_offset of the PT_LOAD will be set to sh_offset, and we will get p_offset!=p_vaddr (mod p_align). If such executable is mapped by the Linux kernel, it will segfault. After D64906, this may happen the non-linker script case. The linker script case has had this issue for a long time. This was fixed by rL321657 (but the test linkerscript/nobits-offset.s failed to test a SHT_NOBITS section), but broken by rL345154. Reviewed By: peter.smith Differential Revision: https://reviews.llvm.org/D66658 llvm-svn: 369828
22 lines
750 B
ArmAsm
22 lines
750 B
ArmAsm
# REQUIRES: aarch64
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# RUN: llvm-mc -filetype=obj -triple=aarch64 %s -o %t.o
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# RUN: ld.lld %t.o -o %t
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# RUN: llvm-readelf -S -l %t | FileCheck %s
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## If a SHT_NOBITS section is the only section of a PT_LOAD segment,
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## p_offset will be set to the sh_offset field of the section. Check we align
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## sh_offset to sh_addr modulo max-page-size, so that p_vaddr=p_offset (mod
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## p_align).
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# CHECK: Name Type Address Off Size ES Flg Lk Inf Al
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# CHECK: .bss NOBITS 0000000000221000 001000 000001 00 WA 0 0 4096
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# CHECK: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
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# CHECK: LOAD 0x001000 0x0000000000221000 0x0000000000221000 0x000000 0x000001 RW 0x10000
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# CHECK: 02 .bss
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.bss
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.p2align 12
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.byte 0
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