linux-kernel - [PATCH] kernel/sys.c: Fix UNAME26 for 5.0

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Message-Id: <20190107180306.16602-1-j.neuschaefer@gmx.net>
Date:   Mon,  7 Jan 2019 19:03:05 +0100
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     linux-kernel@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        YueHaibing <yuehaibing@...wei.com>,
        Arnd Bergmann <arnd@...db.de>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Jann Horn <jannh@...gle.com>, Kees Cook <keescook@...omium.org>
Subject: [PATCH] kernel/sys.c: Fix UNAME26 for 5.0

UNAME26 is a mechanism to report Linux's version as 2.6.x, for
compatibility with old/broken software. Because of the way it is
implemented, it needs to be adjusted to handle version 5.0.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>
---
 kernel/sys.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index a48cbf1414b8..479f4ecdb405 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1208,6 +1208,7 @@ DECLARE_RWSEM(uts_sem);
  * Work around broken programs that cannot handle "Linux 3.0".
  * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40
  * And we map 4.x to 2.6.60+x, so 4.0 would be 2.6.60.
+ * We map 5.x to 2.6.81+x, so 5.0 would be 2.6.81.
  */
 static int override_release(char __user *release, size_t len)
 {
@@ -1227,7 +1228,7 @@ static int override_release(char __user *release, size_t len)
 				break;
 			rest++;
 		}
-		v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 60;
+		v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 81;
 		copy = clamp_t(size_t, len, 1, sizeof(buf));
 		copy = scnprintf(buf, copy, "2.6.%u%s", v, rest);
 		ret = copy_to_user(release, buf, copy + 1);
-- 
2.20.1