https://sourceware.org/bugzilla/show_bug.cgi?id=28494
Bug ID: 28494
Summary: gold combines different aligned/padded SHT_NOTE
sections in the same PT_NOTE segment
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: mark at klomp dot org
CC: ian at airs dot com, mliska at suse dot cz
Target Milestone: ---
Minimal reproducer:
$ echo 'main() { return 0; }' | gcc -x c - -fuse-ld=gold && ./elflint --gnu-ld
a.out
<stdin>:1:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
phdr[6]: unknown object file note type 32 with owner name '' at offset 48
phdr[6]: extra 72 bytes after last note
$ ld.gold --version
GNU gold (GNU Binutils; openSUSE Tumbleweed 2.37.20210803-1) 1.16
$ eu-readelf -l a.out
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz
Flg Align
PHDR 0x000040 0x0000000000400040 0x0000000000400040 0x000230
0x000230 R 0x8
INTERP 0x000270 0x0000000000400270 0x0000000000400270 0x00001c
0x00001c R 0x1
[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
LOAD 0x000000 0x0000000000400000 0x0000000000400000 0x000688
0x000688 R E 0x1000
LOAD 0x000e08 0x0000000000401e08 0x0000000000401e08 0x000208
0x000209 RW 0x1000
DYNAMIC 0x000e18 0x0000000000401e18 0x0000000000401e18 0x0001b0
0x0001b0 RW 0x8
NOTE 0x0002b0 0x00000000004002b0 0x00000000004002b0 0x000030
0x000030 R 0x8
NOTE 0x00028c 0x000000000040028c 0x000000000040028c 0x000078
0x000078 R 0x4
GNU_EH_FRAME 0x000664 0x0000000000400664 0x0000000000400664 0x000024
0x000024 R 0x4
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW 0x10
GNU_RELRO 0x000e08 0x0000000000401e08 0x0000000000401e08 0x0001f8
0x0001f8 RW 0x8
Section to Segment mapping:
Segment Sections...
00
01 [RO: .interp]
02 [RO: .interp .note.ABI-tag .note.gnu.property .note.gnu.build-id
.dynsym .dynstr .gnu.hash .hash .gnu.version .gnu.version_r .rela.dyn .init
.text .fini .rodata .eh_frame .eh_frame_hdr]
03 [RELRO: .fini_array .init_array .dynamic .got .got.plt] .data .bss
04 [RELRO: .dynamic]
05 [RO: .note.gnu.property]
06 [RO: .note.ABI-tag .note.gnu.property .note.gnu.build-id]
07 [RO: .eh_frame_hdr]
08
09 [RELRO: .fini_array .init_array .dynamic .got .got.plt]
Note:
05 [RO: .note.gnu.property]
06 [RO: .note.ABI-tag .note.gnu.property .note.gnu.build-id]
Both segment 05 and segment 06 cover .note.gnu.property, and segment 06 mixes
notes using alignment 8 (causing different padding) and alignment 4
(.note.gnu.property is sandwiched between .note.ABI-tag and
.note.gnu.build-id).
This makes it impossible to properly parse the second PT_NOTE segment.
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