Hi
A while back when I upgraded to FreeBSD 12.2 (and thus to clang 10) I
got quite a new category of errors with Valgrind.
The problem is that the clang 10 toolchain produces two RW LOAD
segments, for instance see below. Valgrind assumes
that there is only one, and ignores the second one which results in
false positives when reading PLTs. I've added a hack
to make it seem like there is just one such segment, but it isn't 100%
reliable - there's at least one issue when loading
shared libraries.
I will carry on looking for a proper solution. In the meantime, are
there any flags to revert to the previous behaviour
and only generate a single RW LOAD segment?
A+
Paul
paulf> /usr/bin/readelf --segments bar_trivial
Elf file type is EXEC (Executable file)
Entry point 0x2018c0
There are 11 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flg Align
[snip]
LOAD 0x0000000000000f80 0x0000000000202f80 0x0000000000202f80
0x0000000000000158 0x0000000000000158 RW 0x1000
LOAD 0x00000000000010d8 0x00000000002040d8 0x00000000002040d8
0x0000000000000090 0x00000000000000a8 RW 0x1000
[snip]
Section to Segment mapping:
Segment Sections...
00
01 .interp
02 .interp .note.tag .dynsym .gnu.version .gnu.version_r
.gnu.hash .hash .dynstr .rela.plt .rodata .eh_frame_hdr .eh_frame
03 .text .init .fini .plt
04 .ctors .dtors .jcr .dynamic
05 .data .got.plt .bss
06 .dynamic
07 .ctors .dtors .jcr .dynamic
08 .eh_frame_hdr
09
10 .note.tag
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