glibc.git/scripts/localplt.awk, branch zack/remove-libcrypt

scripts/localplt.awk: Handle DT_JMPREL with empty PLT (for C-SKY)

2022-10-27T09:36:44+00:00

On csky-linux-gnuabiv2, binutils 2.33 produces a DT_JMPREL entry
for the dynamic loader if it does not contain any PLT relocations:

Dynamic section at offset 0x1df48 contains 19 entries:
  Tag        Type                         Name/Value
 0x0000000e (SONAME)                     Library soname: [ld-linux-cskyv2-hf.so.1]
 0x00000004 (HASH)                       0xd4
 0x6ffffef5 (GNU_HASH)                   0x1a8
 0x00000005 (STRTAB)                     0x4ac
 0x00000006 (SYMTAB)                     0x28c
 0x0000000a (STRSZ)                      527 (bytes)
 0x0000000b (SYMENT)                     16 (bytes)
 0x00000003 (PLTGOT)                     0x1f000
 0x00000002 (PLTRELSZ)                   0 (bytes)
 0x00000014 (PLTREL)                     RELA
 0x00000017 (JMPREL)                     0xaa4
 0x00000007 (RELA)                       0x75c
 0x00000008 (RELASZ)                     840 (bytes)
 0x00000009 (RELAENT)                    12 (bytes)
 0x6ffffffc (VERDEF)                     0x700
 0x6ffffffd (VERDEFNUM)                  3
 0x6ffffff0 (VERSYM)                     0x6bc
 0x6ffffff9 (RELACOUNT)                  68
 0x00000000 (NULL)                       0x0

This confuses the script:

Unexpected output from check-localplt: …/elf/ld.so.jmprel:
*** DT_JMPREL does not match any section's address

This commit changes the script to record the DT_PLTRELSZ value and
reject DT_JMPREL values not a section boundary only if DT_PLTRELSZ
is present with a non-zero value.

Reviewed-by: Siddhesh Poyarekar

Support PLT and GOT references in local PIC check

2015-10-14T13:00:02+00:00

Linker in binutils 2.26 and newer generate GOT references instead
PLT references when -z now is passed to linker.  We need to extend
scripts/localplt.awk to allow PLT or GOT references.

	[BZ #19007]
	* scripts/localplt.awk: Also allow GOT references.
	* sysdeps/unix/sysv/linux/i386/localplt.data: Mark
	_Unwind_Find_FDE, calloc, memalign, realloc and __libc_memalign
	with "+ REL R_386_GLOB_DAT".
	* sysdeps/x86_64/localplt.data: Mark calloc, memalign, realloc
	and __libc_memalign with "+ RELA R_X86_64_GLOB_DAT".

Extend local PLT reference check

2015-07-29T18:58:06+00:00

On x86, linker in binutils 2.26 and newer consolidates R_*_JUMP_SLOT with
R_*_GLOB_DAT relocation against the same symbol.  This patch extends
local PLT reference check to support alternate relocations.

	[BZ #18078]
	* scripts/check-localplt.awk: Support alternate relocations.
	* scripts/localplt.awk: Also check relocations in DT_RELA/DT_REL
	sections.
	* sysdeps/unix/sysv/linux/i386/localplt.data: Mark free and
	malloc entries with + REL R_386_GLOB_DAT.
	* sysdeps/x86_64/localplt.data: New file.

Fix localplt test breakage with new readelf

2015-03-03T13:13:18+00:00

Since 2014-11-24 binutils git commit bb4d2ac2, readelf has appended
the symbol version to symbols shown in reloc dumps.

	[BZ #16512]
	* scripts/localplt.awk: Strip off symbol version.
	* NEWS: Mention bug fix.

Fix localplt check for GNU_IFUNC

2014-03-25T19:15:35+00:00

GNU_IFUNC are shown by readelf in 'Relocation section' value as
"symbol()" instead of expected hexadecimal value. This causes the
check-localplt script to ignore potential PLT stub begin generated
by wrong IFUNC usage.  This patch changes the localplt script to
emit such PLT cases.

Do check-localplt test using readelf rather than a build-time C program.

2012-05-01T20:30:35+00:00