linux-kernel - [tip: objtool/urgent] iov_iter: Mark copy_iovec_from

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Message-ID: <168897683354.404.11598434533900577662.tip-bot2@tip-bot2>
Date:   Mon, 10 Jul 2023 08:13:53 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "Borislav Petkov (AMD)" <bp@...en8.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/urgent] iov_iter: Mark copy_iovec_from_user() noclone

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

Commit-ID:     719a937b7003933de1298ffa4b881dd6a234e244
Gitweb:        https://git.kernel.org/tip/719a937b7003933de1298ffa4b881dd6a234e244
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Fri, 16 Jun 2023 14:43:55 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 10 Jul 2023 09:52:28 +02:00

iov_iter: Mark copy_iovec_from_user() noclone

Extend commit 50f9a76ef127 ("iov_iter: Mark
copy_compat_iovec_from_user() noinline") to also cover
copy_iovec_from_user(). Different compiler versions cause the same
problem on different functions.

lib/iov_iter.o: warning: objtool: .altinstr_replacement+0x1f: redundant UACCESS disable
lib/iov_iter.o: warning: objtool: iovec_from_user+0x84: call to copy_iovec_from_user.part.0() with UACCESS enabled
lib/iov_iter.o: warning: objtool: __import_iovec+0x143: call to copy_iovec_from_user.part.0() with UACCESS enabled

Fixes: 50f9a76ef127 ("iov_iter: Mark copy_compat_iovec_from_user() noinline")
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Tested-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lkml.kernel.org/r/20230616124354.GD4253@hirez.programming.kicks-ass.net
---
 lib/iov_iter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index b667b1e..e4dc809 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1349,7 +1349,7 @@ uaccess_end:
 	return ret;
 }
 
-static int copy_iovec_from_user(struct iovec *iov,
+static __noclone int copy_iovec_from_user(struct iovec *iov,
 		const struct iovec __user *uiov, unsigned long nr_segs)
 {
 	int ret = -EFAULT;