https://sourceware.org/bugzilla/show_bug.cgi?id=27412
Bug ID: 27412
Summary: Suspicious "setting incorrect section attributes for
.note.Linux" warnings on linux kernel
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: slyfox at inbox dot ru
CC: amodra at gmail dot com, hjl.tools at gmail dot com
Target Milestone: ---
When building current linux-5.10 (or master) with gcc-11/binutins-2.36 gas
complains about incorrect (used) section flags. Minimal reproducer:
$ cat bug.c
static const int _note_55 __attribute__((__used__))
__attribute__((section(".note.Linux"))) = 42;
$ gcc-11.0.0 -c bug.c -o bug-11.o -fno-ident
/tmp/ccJ9p7TD.s: Assembler messages:
/tmp/ccJ9p7TD.s:3: Warning: setting incorrect section attributes for
.note.Linux
$ gcc-10.2.0 -c bug.c -o bug-11.o -fno-ident
<ok>
gcc-11 generates the following code:
$ gcc-11.0.0 -S bug.c -o bug-11.s -fno-ident && cat bug-11.s
.file "bug.c"
.text
.section .note.Linux,"aR"
.align 4
.type _note_55, @object
.size _note_55, 4
_note_55:
.long 42
.section .note.GNU-stack,"",@progbits
gcc-10 for completeness:
$ gcc-10.2.0 -S bug.c -o bug-11.s -fno-ident && cat bug-11.s
.file "bug.c"
.text
.section .note.Linux,"a"
.align 4
.type _note_55, @object
.size _note_55, 4
_note_55:
.long 42
.section .note.GNU-stack,"",@progbits
Original code comes from:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/elfnote.h#n71
Is it a real problem or a false positive warning? Currently
gcc-11/binutils-2.36 generates kernels that can't load some modules and
complain about a bunch of orphan sections. I wonder if this warhing is related
and somehow affects future linking.
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