From: Peter Zijlstra peterz@infradead.org
stable inclusion from stable-v5.10.133 commit e87c18c4a951bba1d69c7acaf401d613cf9a828c category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5PTAS CVE: CVE-2022-29900,CVE-2022-23816,CVE-2022-29901
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 7bd2a600f3e9d27286bbf23c83d599e9cc7cf245 upstream.
Track the reloc of instructions in the new instruction->reloc field to avoid having to look them up again later.
( Technically x86 instructions can have two relocations, but not jumps and calls, for which we're using this. )
Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Signed-off-by: Borislav Petkov bp@suse.de Signed-off-by: Ingo Molnar mingo@kernel.org Reviewed-by: Miroslav Benes mbenes@suse.cz Link: https://lkml.kernel.org/r/20210326151300.195441549@infradead.org Signed-off-by: Ben Hutchings ben@decadent.org.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Lin Yujun linyujun809@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- tools/objtool/check.c | 28 ++++++++++++++++++++++------ tools/objtool/check.h | 1 + 2 files changed, 23 insertions(+), 6 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index f87a8782c817..6d62ad940fce 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -754,6 +754,25 @@ __weak bool arch_is_retpoline(struct symbol *sym) return false; }
+#define NEGATIVE_RELOC ((void *)-1L) + +static struct reloc *insn_reloc(struct objtool_file *file, struct instruction *insn) +{ + if (insn->reloc == NEGATIVE_RELOC) + return NULL; + + if (!insn->reloc) { + insn->reloc = find_reloc_by_dest_range(file->elf, insn->sec, + insn->offset, insn->len); + if (!insn->reloc) { + insn->reloc = NEGATIVE_RELOC; + return NULL; + } + } + + return insn->reloc; +} + /* * Find the destination instructions for all jumps. */ @@ -768,8 +787,7 @@ static int add_jump_destinations(struct objtool_file *file) if (!is_static_jump(insn)) continue;
- reloc = find_reloc_by_dest_range(file->elf, insn->sec, - insn->offset, insn->len); + reloc = insn_reloc(file, insn); if (!reloc) { dest_sec = insn->sec; dest_off = arch_jump_destination(insn); @@ -901,8 +919,7 @@ static int add_call_destinations(struct objtool_file *file) if (insn->type != INSN_CALL) continue;
- reloc = find_reloc_by_dest_range(file->elf, insn->sec, - insn->offset, insn->len); + reloc = insn_reloc(file, insn); if (!reloc) { dest_off = arch_jump_destination(insn); insn->call_dest = find_call_destination(insn->sec, dest_off); @@ -1085,8 +1102,7 @@ static int handle_group_alt(struct objtool_file *file, * alternatives code can adjust the relative offsets * accordingly. */ - alt_reloc = find_reloc_by_dest_range(file->elf, insn->sec, - insn->offset, insn->len); + alt_reloc = insn_reloc(file, insn); if (alt_reloc && !arch_support_alt_relocation(special_alt, insn, alt_reloc)) {
diff --git a/tools/objtool/check.h b/tools/objtool/check.h index e0ae2fc13e67..ca3259eebac8 100644 --- a/tools/objtool/check.h +++ b/tools/objtool/check.h @@ -55,6 +55,7 @@ struct instruction { struct instruction *jump_dest; struct instruction *first_jump_src; struct reloc *jump_table; + struct reloc *reloc; struct list_head alts; struct symbol *func; struct list_head stack_ops;