From: Josh Poimboeuf <jpoimboe@redhat.com>
Date: Wed, 28 Feb 2018 07:19:21 -0600
Subject: objtool: Fix another switch table detection issue
Git-commit: 1402fd8ed7e5bda1b3e7613b70780b0db392d1e6
Patch-mainline: v4.16-rc4
References: bsc#1058115
Continue the switch table detection whack-a-mole. Add a check to
distinguish KASAN data reads from switch data reads. The switch jump
tables in .rodata have relocations associated with them.
This fixes the following warning:
crypto/asymmetric_keys/x509_cert_parser.o: warning: objtool: x509_note_pkey_algo()+0xa4: sibling call from callable instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Arnd Bergmann <arnd@arndb.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/d7c8853022ad47d158cb81e953a40469fc08a95e.1519784382.git.jpoimboe@redhat.com
Acked-by: Miroslav Benes <mbenes@suse.cz>
---
tools/objtool/check.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 472e64e95891..46c1d239cc1b 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -925,7 +925,11 @@ static struct rela *find_switch_table(struct objtool_file *file,
if (find_symbol_containing(file->rodata, text_rela->addend))
continue;
- return find_rela_by_dest(file->rodata, text_rela->addend);
+ rodata_rela = find_rela_by_dest(file->rodata, text_rela->addend);
+ if (!rodata_rela)
+ continue;
+
+ return rodata_rela;
}
return NULL;