https://sourceware.org/bugzilla/show_bug.cgi?id=24717
Bug ID: 24717
Summary: .note.gnu.property sections are not stored at an
offset equal to their VMA in debuginfo files
Product: binutils
Version: 2.33 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: nickc at redhat dot com
Target Milestone: ---
The file offset of the .note.gnu.property section in a debuginfo file does not
match its VMA. For example:
% readelf --wide -S /usr/lib/systemd/libsystemd-shared-239.so
[Nr] Name Type Address Off Size ES Flg Lk Inf
Al
[...]
[19] .note.gnu.property NOTE 00000000001fde88 1fde88 000020 00 A 0 0
8
Note that the offset matches the address. This matters because of how
sections are mapped to segments:
% readelf --wide -l /usr/lib/systemd/libsystemd-shared-239.so
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Al
[...]
NOTE 0x1fde88 0x00000000001fde88 0x00000000001fde88 0x000020 0x000020 R 0x8
[...]
06 .note.gnu.property
By contrast, in the debuginfo file for this shared library, the offset of the
.note.gnu.property section has been changed:
% readelf --wide -S
/usr/lib/debug/usr/lib/systemd/libsystemd-shared-239.so-239-11.git4dc7dce.fc29.x86_64.debug
[...]
[Nr] Name Type Address Off Size ES Flg Lk Inf Al
[...]
[19] .note.gnu.property NOTE 00000000001fcd18 0002e0 000020 00 A 0 0 8
So now the .note.gnu.property section is no longer mapped to segment 6:
readelf --wide -l
/usr/lib/debug/usr/lib/systemd/libsystemd-shared-239.so-239-11.git4dc7dce.fc29.x86_64.debug
[...]
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Al
NOTE 0x1fcd18 0x00000000001fcd18 0x00000000001fcd18 0x000020 0x000020 R
0x8
[...]
06
It is also worth pointing out that the same issue does not affect the
.note.build-id section...
This also means that when the debuginfo file is processed either by gdb or
objcopy, a warning is generated:
warning: allocated section `.note.gnu.property' not in segment
This PR is in response to Fedora BZ 1553086:
https://bugzilla.redhat.com/show_bug.cgi?id=1553086
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