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Subject[tip: objtool/core] objtool: Add check_kcov_mode() to the uaccess safelist
The following commit has been merged into the objtool/core branch of tip:

Commit-ID: ae033f088f277efd5b3c6d681ce9e7682380efff
Gitweb: https://git.kernel.org/tip/ae033f088f277efd5b3c6d681ce9e7682380efff
Author: Josh Poimboeuf <jpoimboe@redhat.com>
AuthorDate: Wed, 29 Apr 2020 14:09:04 -05:00
Committer: Josh Poimboeuf <jpoimboe@redhat.com>
CommitterDate: Wed, 20 May 2020 08:30:43 -05:00

objtool: Add check_kcov_mode() to the uaccess safelist

check_kcov_mode() is called by write_comp_data() and
__sanitizer_cov_trace_pc(), which are already on the uaccess safe list.
It's notrace and doesn't call out to anything else, so add it to the
list too.

This fixes the following warnings:

kernel/kcov.o: warning: objtool: __sanitizer_cov_trace_pc()+0x15: call to check_kcov_mode() with UACCESS enabled
kernel/kcov.o: warning: objtool: write_comp_data()+0x1b: call to check_kcov_mode() with UACCESS enabled

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
tools/objtool/check.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index e36a818..7a47ff9 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -507,6 +507,7 @@ static const char *uaccess_safe_builtin[] = {
"__asan_report_store16_noabort",
/* KCOV */
"write_comp_data",
+ "check_kcov_mode",
"__sanitizer_cov_trace_pc",
"__sanitizer_cov_trace_const_cmp1",
"__sanitizer_cov_trace_const_cmp2",
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