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
26 lines
913 B
ArmAsm
26 lines
913 B
ArmAsm
# REQUIRES: x86
|
|
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
|
|
# RUN: echo "SECTIONS { \
|
|
# RUN: .sec1 (NOLOAD) : { . += 1; } \
|
|
# RUN: .bss : { *(.bss) } \
|
|
# RUN: };" > %t.script
|
|
# RUN: ld.lld %t.o -T %t.script -o %t
|
|
# RUN: llvm-readelf -S -l %t | FileCheck %s
|
|
|
|
## If a SHT_NOBITS section is the only section of a PT_LOAD segment,
|
|
## p_offset will be set to the sh_offset field of the section. Check we align
|
|
## sh_offset to sh_addr modulo max-page-size, so that p_vaddr=p_offset (mod
|
|
## p_align).
|
|
|
|
# CHECK: Name Type Address Off Size ES Flg Lk Inf Al
|
|
# CHECK: .bss NOBITS 0000000000000400 001400 000001 00 WA 0 0 1024
|
|
|
|
# CHECK: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
|
|
# CHECK: LOAD 0x001400 0x0000000000000400 0x0000000000000400 0x000000 0x000001 RW 0x1000
|
|
|
|
# CHECK: 00 .bss
|
|
|
|
.bss
|
|
.p2align 10
|
|
.byte 0
|