linux-kernel - [RFC] [PATCH] Improve the remove sysctl warnings.

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Date:	Wed, 18 Oct 2006 22:41:29 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andrew Morton <akpm@...l.org>
Cc:	Cal Peake <cp@...olutedigital.net>,
	Linus Torvalds <torvalds@...l.org>,
	Albert Cahalan <acahalan@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	ebiederm@...ssion.com
Subject: [RFC] [PATCH] Improve the remove sysctl warnings.


Andrew how does this look?

Don't warn about libpthread's access to kernel.version.
When it receives -ENOSYS it will read /proc/sys/kernel/version.

If anything else shows up print the sysctl number string.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 kernel/sysctl.c |   22 +++++++++++++++++++++-
 1 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 8020fb2..19124ee 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2676,13 +2676,33 @@ #else /* CONFIG_SYSCTL_SYSCALL */
 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
 {
 	static int msg_count;
+	struct __sysctl_args tmp;
+	int name[CTL_MAXNAME];
+	int i;
+
+	/* Read in the sysctl name for better debug message logging */
+	if (copy_from_user(&tmp, args, sizeof(tmp)))
+		return -EFAULT;
+	if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
+		return -ENOTDIR;
+	for (i = 0; i < tmp.nlen; i++)
+		if (get_user(name[i], tmp.name + i))
+			return -EFAULT;
 
+	/* Ignore accesses to kernel.version */
+	if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
+		goto out;
+	
 	if (msg_count < 5) {
 		msg_count++;
 		printk(KERN_INFO
 			"warning: process `%s' used the removed sysctl "
-			"system call\n", current->comm);
+			"system call with ", current->comm);
+		for (i = 0; i < tmp.nlen; i++)
+			printk("%d.", name[i]);
+		printk("\n");
 	}
+out:
 	return -ENOSYS;
 }
 
-- 
1.4.2.rc3.g7e18e-dirty

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