From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Thomas Lamprecht <t.lamprecht@proxmox.com>
Date: Mon, 6 Nov 2023 10:17:02 +0100
Subject: [PATCH] revert "memfd: improve userspace warnings for missing
 exec-related flags".

This warning is telling userspace developers to pass MFD_EXEC and
MFD_NOEXEC_SEAL to memfd_create().  Commit 434ed3350f57 ("memfd: improve
userspace warnings for missing exec-related flags") made the warning more
frequent and visible in the hope that this would accelerate the fixing of
errant userspace.

But the overall effect is to generate far too much dmesg noise.

Fixes: 434ed3350f57 ("memfd: improve userspace warnings for missing exec-related flags")
Reported-by: Damian Tometzki <dtometzki@fedoraproject.org>
Closes: https://lkml.kernel.org/r/ZPFzCSIgZ4QuHsSC@fedora.fritz.box
Cc: Aleksa Sarai <cyphar@cyphar.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Daniel Verkamp <dverkamp@chromium.org>
Cc: Jeff Xu <jeffxu@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 (cherry picked from commit 2562d67b1bdf91c7395b0225d60fdeb26b4bc5a0)
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
---
 mm/memfd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memfd.c b/mm/memfd.c
index d3a1ba4208c9..6a9de5d9105e 100644
--- a/mm/memfd.c
+++ b/mm/memfd.c
@@ -282,7 +282,7 @@ static int check_sysctl_memfd_noexec(unsigned int *flags)
 	}
 
 	if (!(*flags & MFD_NOEXEC_SEAL) && sysctl >= MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED) {
-		pr_err_ratelimited(
+		pr_warn_once(
 			"%s[%d]: memfd_create() requires MFD_NOEXEC_SEAL with vm.memfd_noexec=%d\n",
 			current->comm, task_pid_nr(current), sysctl);
 		return -EACCES;