linux-kernel - [PATCH] fs: Amended coredump-related sysctl functions

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Message-Id: <1346051279-4282-1-git-send-email-alex.page.kelly@gmail.com>
Date:	Mon, 27 Aug 2012 00:07:56 -0700
From:	Alex Kelly <alex.page.kelly@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Kees Cook <keescook@...omium.org>,
	David Howells <dhowells@...hat.com>,
	Josh Triplett <josh@...htriplett.org>,
	linux-kernel@...r.kernel.org
Cc:	Alex Kelly <alex.page.kelly@...il.com>
Subject: [PATCH] fs: Amended coredump-related sysctl functions

This fixes an error introduced in the coredump-header patch in
the coredump removal patch I submitted earlier. It should be squashed
into that patch series so that the Kconfig option to remove coredump
doesn't cause compile-time errors.

Signed-off-by: Alex Kelly <alex.page.kelly@...il.com>
Reviewed-by: Josh Triplett <josh@...htriplett.org>
---
Note to Andrew Morton: This is a small fix of an oversight in the coredump
patch I submitted earlier. Could this be squashed into the others in -mm?

 kernel/sysctl.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index af57e84..e28542d 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -179,8 +179,10 @@ static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 
 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 		void __user *buffer, size_t *lenp, loff_t *ppos);
+#ifdef CONFIG_COREDUMP
 static int proc_dostring_coredump(struct ctl_table *table, int write,
 		void __user *buffer, size_t *lenp, loff_t *ppos);
+#endif
 
 #ifdef CONFIG_MAGIC_SYSRQ
 /* Note: sysrq code uses it's own private copy */
@@ -2040,12 +2042,14 @@ int proc_dointvec_minmax(struct ctl_table *table, int write,
 
 static void validate_coredump_safety(void)
 {
+#ifdef CONFIG_COREDUMP
 	if (suid_dumpable == SUID_DUMPABLE_SAFE &&
 	    core_pattern[0] != '/' && core_pattern[0] != '|') {
 		printk(KERN_WARNING "Unsafe core_pattern used with "\
 			"suid_dumpable=2. Pipe handler or fully qualified "\
 			"core dump path required.\n");
 	}
+#endif
 }
 
 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
@@ -2057,6 +2061,7 @@ static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 	return error;
 }
 
+#ifdef CONFIG_COREDUMP
 static int proc_dostring_coredump(struct ctl_table *table, int write,
 		  void __user *buffer, size_t *lenp, loff_t *ppos)
 {
@@ -2064,7 +2069,9 @@ static int proc_dostring_coredump(struct ctl_table *table, int write,
 	if (!error)
 		validate_coredump_safety();
 	return error;
+	return 0;
 }
+#endif
 
 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
 				     void __user *buffer,
-- 
1.7.11.4

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