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authorVasily Averin <vvs@virtuozzo.com>2015-06-25 15:01:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-25 17:00:39 -0700
commit3ea4331c60be3eee4c97e5ddabad95399f879b76 (patch)
tree6977f3c7a8a72003f3b324de5ce4bb490274ff53
parentd194e5d666225b04c7754471df0948f645b6ab3a (diff)
check_syslog_permissions() cleanup
Patch fixes drawbacks in heck_syslog_permissions() noticed by AKPM: "from_file handling makes me cry. That's not a boolean - it's an enumerated value with two values currently defined. But the code in check_syslog_permissions() treats it as a boolean and also hardwires the knowledge that SYSLOG_FROM_PROC == 1 (or == `true`). And the name is wrong: it should be called from_proc to match SYSLOG_FROM_PROC." Signed-off-by: Vasily Averin <vvs@virtuozzo.com> Cc: Kees Cook <keescook@chromium.org> Cc: Josh Boyer <jwboyer@redhat.com> Cc: Eric Paris <eparis@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/syslog.h6
-rw-r--r--kernel/printk/printk.c10
2 files changed, 8 insertions, 8 deletions
diff --git a/include/linux/syslog.h b/include/linux/syslog.h
index 4b7b875a7ce1..c3a7f0cc3a27 100644
--- a/include/linux/syslog.h
+++ b/include/linux/syslog.h
@@ -47,12 +47,12 @@
#define SYSLOG_FROM_READER 0
#define SYSLOG_FROM_PROC 1
-int do_syslog(int type, char __user *buf, int count, bool from_file);
+int do_syslog(int type, char __user *buf, int count, int source);
#ifdef CONFIG_PRINTK
-int check_syslog_permissions(int type, bool from_file);
+int check_syslog_permissions(int type, int source);
#else
-static inline int check_syslog_permissions(int type, bool from_file)
+static inline int check_syslog_permissions(int type, int source)
{
return 0;
}
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 45fa8c88ac47..de553849f3ac 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -489,13 +489,13 @@ static int syslog_action_restricted(int type)
type != SYSLOG_ACTION_SIZE_BUFFER;
}
-int check_syslog_permissions(int type, bool from_file)
+int check_syslog_permissions(int type, int source)
{
/*
* If this is from /proc/kmsg and we've already opened it, then we've
* already done the capabilities checks at open time.
*/
- if (from_file && type != SYSLOG_ACTION_OPEN)
+ if (source == SYSLOG_FROM_PROC && type != SYSLOG_ACTION_OPEN)
goto ok;
if (syslog_action_restricted(type)) {
@@ -1290,13 +1290,13 @@ static int syslog_print_all(char __user *buf, int size, bool clear)
return len;
}
-int do_syslog(int type, char __user *buf, int len, bool from_file)
+int do_syslog(int type, char __user *buf, int len, int source)
{
bool clear = false;
static int saved_console_loglevel = LOGLEVEL_DEFAULT;
int error;
- error = check_syslog_permissions(type, from_file);
+ error = check_syslog_permissions(type, source);
if (error)
goto out;
@@ -1379,7 +1379,7 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
syslog_prev = 0;
syslog_partial = 0;
}
- if (from_file) {
+ if (source == SYSLOG_FROM_PROC) {
/*
* Short-cut for poll(/"proc/kmsg") which simply checks
* for pending data, not the size; return the count of