From: Collin Funk <collin.funk1@gmail.com>
Date: Tue, 25 Mar 2025 15:17:55 +0000 (-0400)
Subject: linux: Fix integer overflow warnings when including <sys/mount.h> [BZ #32708]
X-Git-Tag: glibc-2.42~356
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3263675250cbcbbcc76ede4f7c660418bd345a11;p=thirdparty%2Fglibc.git

linux: Fix integer overflow warnings when including <sys/mount.h> [BZ #32708]

Using gcc -Wshift-overflow=2 -Wsystem-headers to compile a file
including <sys/mount.h> will cause a warning since 1 << 31 is undefined
behavior on platforms where int is 32-bits.

Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
---

diff --git a/sysdeps/unix/sysv/linux/sys/mount.h b/sysdeps/unix/sysv/linux/sys/mount.h
index 7c6d0805d7..b549e75148 100644
--- a/sysdeps/unix/sysv/linux/sys/mount.h
+++ b/sysdeps/unix/sysv/linux/sys/mount.h
@@ -121,7 +121,7 @@ enum
   MS_ACTIVE = 1 << 30,
 #define MS_ACTIVE	MS_ACTIVE
 #undef MS_NOUSER
-  MS_NOUSER = 1 << 31
+  MS_NOUSER = 1U << 31
 #define MS_NOUSER	MS_NOUSER
 };