[PATCH 2/4] audit: uninitialize global variable audit_sig_sid

[PATCH 2/4] audit: uninitialize global variable audit_sig_sid

[Jules Irenge]

Checkpatch tool reports an error at variable audit_sig_sid declaration

"ERROR: do not initialise globals to 0"

To fix this, the global variable has been uninitialized.

Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
---
 kernel/audit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 8c201f414226..7b1a38a211a9 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -125,7 +125,7 @@ static u32	audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
 /* The identity of the user shutting down the audit system. */
 kuid_t		audit_sig_uid = INVALID_UID;
 pid_t		audit_sig_pid = -1;
-u32		audit_sig_sid = 0;
+u32		audit_sig_sid;
 
 /* Records can be lost in several ways:
    0) [suppressed in audit_alloc]
-- 
2.26.2

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[PATCH 3/4] audit: uninitialize static variables

[Jules Irenge]

Checkpatch tool reports an error at variable declaration

"ERROR: do not initialise statics to 0"

This is due to the fact that these variables are stored in the buffer
In the .bss section, one can not set an initial value
Here we can trust the compiler to automatically set them to zero.
The variable has since been uninitialized.

Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
---
 kernel/audit.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 7b1a38a211a9..7d79ecb58b01 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -311,8 +311,8 @@ void audit_panic(const char *message)
 
 static inline int audit_rate_check(void)
 {
-	static unsigned long	last_check = 0;
-	static int		messages   = 0;
+	static unsigned long	last_check;
+	static int		messages;
 	static DEFINE_SPINLOCK(lock);
 	unsigned long		flags;
 	unsigned long		now;
@@ -348,7 +348,7 @@ static inline int audit_rate_check(void)
 */
 void audit_log_lost(const char *message)
 {
-	static unsigned long	last_msg = 0;
+	static unsigned long	last_msg;
 	static DEFINE_SPINLOCK(lock);
 	unsigned long		flags;
 	unsigned long		now;
@@ -713,7 +713,7 @@ static int kauditd_send_queue(struct sock *sk, u32 portid,
 {
 	int rc = 0;
 	struct sk_buff *skb;
-	static unsigned int failed = 0;
+	static unsigned int failed;
 
 	/* NOTE: kauditd_thread takes care of all our locking, we just use
 	 *       the netlink info passed to us (e.g. sk and portid) */
-- 
2.26.2

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Re: [PATCH 2/4] audit: uninitialize global variable audit_sig_sid

[Joe Perches]

On Sat, 2020-08-01 at 19:46 +0100, Jules Irenge wrote:
> Checkpatch tool reports an error at variable audit_sig_sid declaration
[]
> diff --git a/kernel/audit.c b/kernel/audit.c
[]
> @@ -125,7 +125,7 @@ static u32	audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
>  /* The identity of the user shutting down the audit system. */
>  kuid_t		audit_sig_uid = INVALID_UID;
>  pid_t		audit_sig_pid = -1;
> -u32		audit_sig_sid = 0;
> +u32		audit_sig_sid;

All of these are unused outside of audit.c and might as
well be static and removed from the .h file.


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Re: [PATCH 3/4] audit: uninitialize static variables

[Paul Moore]

On Sat, Aug 1, 2020 at 2:46 PM Jules Irenge <jbi.octave@gmail.com> wrote:
>
> Checkpatch tool reports an error at variable declaration
>
> "ERROR: do not initialise statics to 0"
>
> This is due to the fact that these variables are stored in the buffer
> In the .bss section, one can not set an initial value
> Here we can trust the compiler to automatically set them to zero.
> The variable has since been uninitialized.
>
> Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
> ---
>  kernel/audit.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

In general this is fine, but it will have to wait until after the
merge window closes.

> diff --git a/kernel/audit.c b/kernel/audit.c
> index 7b1a38a211a9..7d79ecb58b01 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -311,8 +311,8 @@ void audit_panic(const char *message)
>
>  static inline int audit_rate_check(void)
>  {
> -       static unsigned long    last_check = 0;
> -       static int              messages   = 0;
> +       static unsigned long    last_check;
> +       static int              messages;
>         static DEFINE_SPINLOCK(lock);
>         unsigned long           flags;
>         unsigned long           now;
> @@ -348,7 +348,7 @@ static inline int audit_rate_check(void)
>  */
>  void audit_log_lost(const char *message)
>  {
> -       static unsigned long    last_msg = 0;
> +       static unsigned long    last_msg;
>         static DEFINE_SPINLOCK(lock);
>         unsigned long           flags;
>         unsigned long           now;
> @@ -713,7 +713,7 @@ static int kauditd_send_queue(struct sock *sk, u32 portid,
>  {
>         int rc = 0;
>         struct sk_buff *skb;
> -       static unsigned int failed = 0;
> +       static unsigned int failed;
>
>         /* NOTE: kauditd_thread takes care of all our locking, we just use
>          *       the netlink info passed to us (e.g. sk and portid) */
> --
> 2.26.2

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Re: [PATCH 2/4] audit: uninitialize global variable audit_sig_sid

[Paul Moore]

On Sat, Aug 1, 2020 at 2:55 PM Joe Perches <joe@perches.com> wrote:
> On Sat, 2020-08-01 at 19:46 +0100, Jules Irenge wrote:
> > Checkpatch tool reports an error at variable audit_sig_sid declaration
> []
> > diff --git a/kernel/audit.c b/kernel/audit.c
> []
> > @@ -125,7 +125,7 @@ static u32        audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
> >  /* The identity of the user shutting down the audit system. */
> >  kuid_t               audit_sig_uid = INVALID_UID;
> >  pid_t                audit_sig_pid = -1;
> > -u32          audit_sig_sid = 0;
> > +u32          audit_sig_sid;
>
> All of these are unused outside of audit.c and might as
> well be static and removed from the .h file.

There's plenty of time before the merge window closes, doing this
would definitely make this patch much more useful than the typical
checkpatch noise.

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Re: [PATCH 2/4] audit: uninitialize global variable audit_sig_sid

[Jules Irenge]

On Sat, 1 Aug 2020, Joe Perches wrote:

> On Sat, 2020-08-01 at 19:46 +0100, Jules Irenge wrote:
> > Checkpatch tool reports an error at variable audit_sig_sid declaration
> []
> > diff --git a/kernel/audit.c b/kernel/audit.c
> []
> > @@ -125,7 +125,7 @@ static u32	audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
> >  /* The identity of the user shutting down the audit system. */
> >  kuid_t		audit_sig_uid = INVALID_UID;
> >  pid_t		audit_sig_pid = -1;
> > -u32		audit_sig_sid = 0;
> > +u32		audit_sig_sid;
> 
> All of these are unused outside of audit.c and might as
> well be static and removed from the .h file.
> 

Thanks for reply, I will resend a second version with the recommendation,  
namely make the above static and remove them from the .h file.

Jules

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