binutils-gdb/dt-relr-glibc-1b.rd at bbcab3366bc5269c2896e82ebd1b0f068ec9a50b - binutils-gdb - Collaboration & Inovation

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H.J. Lu 72aa81732b ld: Add glibc dependency for DT_RELR

When DT_RELR is enabled, to avoid random run-time crash with older glibc
binaries without DT_RELR support, add a GLIBC_ABI_DT_RELR symbol version,
which is provided by glibc with DT_RELR support, dependency on the shared
C library if it provides a GLIBC_2.XX symbol version.

bfd/

	* elflink.c (elf_link_add_dt_relr_dependency): New function.
	(bfd_elf_size_dynamic_sections): Call
	elf_link_add_dt_relr_dependency if DT_RELR is enabled.

ld/

	* ld.texi: Mention GLIBC_ABI_DT_RELR in -z pack-relative-relocs
	entry.
	* testsuite/ld-elf/dt-relr-glibc-1.c: New file.
	* testsuite/ld-elf/dt-relr-glibc-1a.rd: Likewise.
	* testsuite/ld-elf/dt-relr-glibc-1b.rd: Likewise.
	* testsuite/ld-elf/dt-relr.exp: Likewise.

2022-01-12 06:08:47 -08:00

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 #...
 Version needs section '.gnu.version_r' contains 1 entry:
  Addr: 0x[0-9a-f]+ +Offset: 0x[0-9a-f]+ +Link: +[0-9]+ +\(.dynstr\)
  +0+: Version: 1 +File: libc\.so\.6(|\.1) +Cnt: +[0-9]+
 #...
 x[a-f0-9]+:   Name: GLIBC_ABI_DT_RELR  Flags: none  Version: [0-9]+
 #pass