https://sourceware.org/bugzilla/show_bug.cgi?id=23561
Bug ID: 23561
Summary: linux x86_64: ELF PHDR not mapped
Product: binutils
Version: 2.31
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: felix-glibc at fefe dot de
Target Milestone: ---
I'm using gcc 8.2.0 with binutils 2.31.1 to build my dietlibc
(www.fefe.de/dietlibc/, use CVS version to reproduce).
Part of the startup code of my libc goes through auxvec to find PT_TLS and then
initialize the thread local storage.
Now, this code worked fine for years. When I make clean and build with the
above mentioned versions, I get a segfault in the AT_PHDR traversal, because
AT_PHDR points to 0x400040 but /proc/pid/maps says:
00401000-00404000 r-xp 00001000 08:12 19664433
And indeed, readelf on the binary shows that:
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000001000 0x0000000000401000 0x0000000000401000
0x00000000000021e7 0x00000000000021e7 R E 0x1000
So the kernel did as it was told and loaded starting from 1000.
My current understanding is that I did it right and this is a bug in binutils
to put the wrong value in the ELF header. Am I wrong? How else am I supposed to
access the PHDR? Or maybe I am supposed to find the thread local storage data
some other way?
Please advise.
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