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x86,objtool: Create .return_sites

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commit d9e9d2300681d68a775c28de6aa6e5290ae17796 upstream.

Find all the return-thunk sites and record them in a .return_sites
section such that the kernel can undo this.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
[cascardo: conflict fixup because of functions added to support IBT]
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
[bwh: Backported to 5.10: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Zijlstra
2022-06-14 23:15:38 +02:00
committed by Greg Kroah-Hartman
parent 716410960b
commit 8bdb25f7ae
6 changed files with 84 additions and 0 deletions
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5
tools/objtool/arch/x86/decode.c
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@@ -649,3 +649,8 @@ bool arch_is_retpoline(struct symbol *sym)
{
return !strncmp(sym->name, "__x86_indirect_", 15);
}
bool arch_is_rethunk(struct symbol *sym)
{
return !strcmp(sym->name, "__x86_return_thunk");
}