]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
objtool: Teach get_alt_entry() about more relocation types
authorPeter Zijlstra <peterz@infradead.org>
Thu, 30 Sep 2021 10:43:10 +0000 (12:43 +0200)
committerPeter Zijlstra <peterz@infradead.org>
Fri, 1 Oct 2021 11:57:47 +0000 (13:57 +0200)
commit24ff652573754fe4c03213ebd26b17e86842feb3
treee50930aa185cfdae8dffb8d4e2fde79a14c1b5bc
parente4e737bb5c170df6135a127739a9e6148ee3da82
objtool: Teach get_alt_entry() about more relocation types

Occasionally objtool encounters symbol (as opposed to section)
relocations in .altinstructions. Typically they are the alternatives
written by elf_add_alternative() as encountered on a noinstr
validation run on vmlinux after having already ran objtool on the
individual .o files.

Basically this is the counterpart of commit 44f6a7c0755d ("objtool:
Fix seg fault with Clang non-section symbols"), because when these new
assemblers (binutils now also does this) strip the section symbols,
elf_add_reloc_to_insn() is forced to emit symbol based relocations.

As such, teach get_alt_entry() about different relocation types.

Fixes: 9bc0bb50727c ("objtool/x86: Rewrite retpoline thunk calls")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/YVWUvknIEVNkPvnP@hirez.programming.kicks-ass.net
tools/objtool/special.c