https://sourceware.org/bugzilla/show_bug.cgi?id=24769
Bug ID: 24769
Summary: [RISCV] partial RELRO doesn't work: .got is not in
PT_GNU_RELRO
Product: binutils
Version: 2.33 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: maskray at google dot com
Target Milestone: ---
% riscv64-linux-gnu-gcc -fuse-ld=bfd a.c -Wl,-z,relro -Wl,-Map,a.map -o a
% readelf -l a
....
07 .preinit_array .init_array .fini_array .dynamic
Note .got is not in PT_GNU_RELRO.
In the link map, we can see that .got.plt is placed before .got, which is
unusual (likely a bug).
% cat a.map
...
.got 0x0000000000002008 0x40
*(.got.plt)
.got.plt 0x0000000000002008 0x18
/path/to/riscv64-linux-gnu-gcc/usr/bin/../lib/gcc-cross/riscv64-linux-gnu/8/../../../../riscv64-linux-gnu/lib/Scrt1.o
*(.igot.plt)
*(.got)
.got 0x0000000000002020 0x28
/path/to/riscv64-linux-gnu-gcc/usr/bin/../lib/gcc-cross/riscv64-linux-gnu/8/../../../../riscv64-linux-gnu/lib/Scrt1.o
0x0000000000002020 _GLOBAL_OFFSET_TABLE_
*(.igot)
The presence of .preinit_array (from Scrt1.o) is also weird.
% readelf -x .preinit_array a
Hex dump of section '.preinit_array':
0x00001e08 00000000 00000000 ........
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