[PATCH 01/10] sysctl: Update sysctl_check_table

[Eric W. Biederman]

Well it turns out after I dug into the problems a
little more I was returning a few false positives
so this patch updates my logic to remove them.

- Don't complain about 0 ctl_names in sysctl_check_binary_path
  It is valid for someone to remove the sysctl binary interface
  and still keep the same sysctl proc interface.

- Count ctl_names and procnames as matching if they both don't
  exist.

- Only warn about missing min&max when the generic functions care.

Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
---
 kernel/sysctl_check.c |   30 ++++++++++++++++--------------
 1 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/kernel/sysctl_check.c b/kernel/sysctl_check.c
index 389c4ba..930a514 100644
--- a/kernel/sysctl_check.c
+++ b/kernel/sysctl_check.c
@@ -1420,12 +1420,14 @@ static int sysctl_check_dir(struct ctl_table *table)
 	ref = sysctl_check_lookup(table);
 	if (ref) {
 		int match = 0;
-		if (table->procname && ref->procname &&
-		    (strcmp(table->procname, ref->procname) == 0))
+		if ((!table->procname && !ref->procname) ||
+		    (table->procname && ref->procname &&
+		     (strcmp(table->procname, ref->procname) == 0)))
 			match++;
 
-		if (table->ctl_name && ref->ctl_name &&
-		    (table->ctl_name == ref->ctl_name))
+		if ((!table->ctl_name && !ref->ctl_name) ||
+		    (table->ctl_name && ref->ctl_name &&
+		     (table->ctl_name == ref->ctl_name)))
 			match++;
 
 		if (match != 2) {
@@ -1462,8 +1464,8 @@ static void sysctl_check_bin_path(struct ctl_table *table, const char **fail)
 		     (strcmp(table->procname, ref->procname) != 0)))
 			set_fail(fail, table, "procname does not match binary path procname");
 
-		if (ref->ctl_name &&
-		    (!table->ctl_name || table->ctl_name != ref->ctl_name))
+		if (ref->ctl_name && table->ctl_name &&
+		    (table->ctl_name != ref->ctl_name))
 			set_fail(fail, table, "ctl_name does not match binary path ctl_name");
 	}
 }
@@ -1499,7 +1501,7 @@ int sysctl_check_table(struct ctl_table *table)
 			if (table->extra2)
 				set_fail(&fail, table, "Directory with extra2");
 			if (sysctl_check_dir(table))
-				set_fail(&fail, table, "Inconsistent directory");
+				set_fail(&fail, table, "Inconsistent directory names");
 		} else {
 			if ((table->strategy == sysctl_data) ||
 			    (table->strategy == sysctl_string) ||
@@ -1520,14 +1522,14 @@ int sysctl_check_table(struct ctl_table *table)
 				if (!table->maxlen)
 					set_fail(&fail, table, "No maxlen");
 			}
-			if ((table->strategy == sysctl_intvec) ||
-			    (table->proc_handler == proc_dointvec_minmax) ||
-			    (table->proc_handler == proc_doulongvec_minmax) ||
+			if ((table->proc_handler == proc_doulongvec_minmax) ||
 			    (table->proc_handler == proc_doulongvec_ms_jiffies_minmax)) {
-				if (!table->extra1)
-					set_fail(&fail, table, "No min");
-				if (!table->extra2)
-					set_fail(&fail, table, "No max");
+				if (table->maxlen > sizeof (unsigned long)) {
+					if (!table->extra1)
+						set_fail(&fail, table, "No min");
+					if (!table->extra2)
+						set_fail(&fail, table, "No max");
+				}
 			}
 			if (table->ctl_name && !table->strategy)
 				set_fail(&fail, table, "Missing strategy");
-- 
1.5.1.1.181.g2de0

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