linux-kernel - [tip: objtool/core] objtool: Add stackleak instrumentation to uaccess safe list

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Date:   Fri, 14 Apr 2023 14:47:56 -0000
From:   "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Josh Poimboeuf <jpoimboe@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] objtool: Add stackleak instrumentation to uaccess
 safe list

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     7f530fba1123edcad00d59e1a73019814935f0c1
Gitweb:        https://git.kernel.org/tip/7f530fba1123edcad00d59e1a73019814935f0c1
Author:        Josh Poimboeuf <jpoimboe@...nel.org>
AuthorDate:    Wed, 12 Apr 2023 10:29:35 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 14 Apr 2023 16:08:27 +02:00

objtool: Add stackleak instrumentation to uaccess safe list

If a function has a large stack frame, the stackleak plugin adds a call
to stackleak_track_stack() after the prologue.

This function may be called in uaccess-enabled code.  Add it to the
uaccess safe list.

Fixes the following warning:

  vmlinux.o: warning: objtool: kasan_report+0x12: call to stackleak_track_stack() with UACCESS enabled

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/42e9b487ef89e9b237fd5220ad1c7cf1a2ad7eb8.1681320562.git.jpoimboe@kernel.org
---
 tools/objtool/check.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 9440b07..4c8ef81 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1279,6 +1279,8 @@ static const char *uaccess_safe_builtin[] = {
 	"__ubsan_handle_type_mismatch_v1",
 	"__ubsan_handle_shift_out_of_bounds",
 	"__ubsan_handle_load_invalid_value",
+	/* STACKLEAK */
+	"stackleak_track_stack",
 	/* misc */
 	"csum_partial_copy_generic",
 	"copy_mc_fragile",