https://sourceware.org/bugzilla/show_bug.cgi?id=28743
Bug ID: 28743
Summary: BFD ld: ELF LOAD segments creating holes in the
process image on GNU/Linux
Product: binutils
Version: 2.37
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: fweimer at redhat dot com
CC: hjl.tools at gmail dot com
Target Milestone: ---
Flags: security-
BFD ld sometimes creates executables that have holes between PT_LOAD segments.
An example is /usr/bin/psql in postgresql-13.4-2.fc35.x86_64 (Fedora 35).
The kernel creates an actual hole, as can be seen from /proc/self/maps:
5591bcaa6000-5591bcab9000 r--p 00000000 103:02 271992
/usr/bin/psql
5591bcab9000-5591bcb0b000 r-xp 00013000 103:02 271992
/usr/bin/psql
5591bcb0b000-5591bcb49000 r--p 00065000 103:02 271992
/usr/bin/psql
[49096 byte hole here]
5591bcb4a000-5591bcb52000 r--p 000a3000 103:02 271992
/usr/bin/psql
5591bcb52000-5591bcb53000 rw-p 000ab000 103:02 271992
/usr/bin/psql
I assume this position-independent executable was linked with -z separate-code
(our toolchain default). binutils-2.37-10.fc35.x86_64 was used for this build.
This does not happen for all executables. I do not know the triggering
conditions.
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