Joe Lawrence dc02368164 objtool: Make .altinstructions section entry size consistent ... Commit e31694e0a7 ("objtool: Don't make .altinstructions writable") aligned objtool-created and kernel-created .altinstructions section flags, but there remains a minor discrepency in their use of a section entry size: objtool sets one while the kernel build does not. While sh_entsize of sizeof(struct alt_instr) seems intuitive, this small deviation can cause failures with external tooling (kpatch-build). Fix this by creating new .altinstructions sections with sh_entsize of 0 and then later updating sec->sh_size as alternatives are added to the section. An added benefit is avoiding the data descriptor and buffer created by elf_create_section(), but previously unused by elf_add_alternative(). Fixes: 9bc0bb5072 ("objtool/x86: Rewrite retpoline thunk calls") Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com> Reviewed-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lore.kernel.org/r/20210822225037.54620-2-joe.lawrence@redhat.com Cc: Andy Lavr <andy.lavr@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org		2021-10-05 12:03:20 -07:00
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include/arch	objtool: Decode jump_entry::key addend	2021-05-12 14:54:55 +02:00
Build	objtool: Abstract alternative special case handling	2020-09-10 10:43:13 -05:00
decode.c	objtool: Make .altinstructions section entry size consistent	2021-10-05 12:03:20 -07:00
special.c	objtool: Fix retpoline detection in asm code	2021-01-26 11:11:59 -06:00