linux-kernel - [tip: sched/core] objtool: mem*() are not uaccess safe

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Message-ID: <167611145523.4906.11994571404061961204.tip-bot2@tip-bot2>
Date:   Sat, 11 Feb 2023 10:30:55 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Paul E. McKenney" <paulmck@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] objtool: mem*() are not uaccess safe

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

Commit-ID:     443ed4c302fff6a26af980300463343a7adc9ee8
Gitweb:        https://git.kernel.org/tip/443ed4c302fff6a26af980300463343a7adc9ee8
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Mon, 30 Jan 2023 15:21:02 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Sat, 11 Feb 2023 11:18:08 +01:00

objtool: mem*() are not uaccess safe

For mysterious raisins I listed the new __asan_mem*() functions as
being uaccess safe, this is giving objtool fails on KASAN builds
because these functions call out to the actual __mem*() functions
which are not marked uaccess safe.

Removing it doesn't make the robots unhappy.

Fixes: 69d4c0d32186 ("entry, kasan, x86: Disallow overriding mem*() functions")
Reported-by: "Paul E. McKenney" <paulmck@...nel.org>
Bisected-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20230126182302.GA687063@paulmck-ThinkPad-P17-Gen-1
---
 tools/objtool/check.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 10b5bb4..b118f58 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1083,9 +1083,6 @@ static const char *uaccess_safe_builtin[] = {
 	"__asan_store16_noabort",
 	"__kasan_check_read",
 	"__kasan_check_write",
-	"__asan_memset",
-	"__asan_memmove",
-	"__asan_memcpy",
 	/* KASAN in-line */
 	"__asan_report_load_n_noabort",
 	"__asan_report_load1_noabort",