6:30 p.m.
I've been working off of Richard Guy Brigs git repo on branch
audit-for-next prepping my patch and I noticed a build warning:
kernel/audit.c:832:8: warning: format ‘%A’ expects argument of type
‘double’, but argument 3 has type ‘char *’ [-Wformat]
Looking at the code, it looks wrong:
--
Respectfully,
William C Roberts
6:31 p.m.
On Mon, Oct 28, 2013 at 4:30 PM, William Roberts
<bill.c.roberts(a)gmail.com>wrote:
--
Respectfully,
William C Roberts
I've been working off of Richard Guy Brigs git repo on branch
audit-for-next prepping my patch and I noticed a build warning:
kernel/audit.c:832:8: warning: format ‘%A’ expects argument of type
‘double’, but argument 3 has type ‘char *’ [-Wformat]
Looking at the code, it looks wrong:
audit_log_format(ab,
"
msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
(char *)data);
The issue appears on the % specifier in there, it picks it up as %.A, which
is of type double. Is this what was intended?
<snip
8:35 p.m.
On Mon, Oct 28, 2013 at 04:31:30PM -0700, William Roberts wrote:
On Mon, Oct 28, 2013 at 4:30 PM, William Roberts
<bill.c.roberts(a)gmail.com>wrote:
> I've been working off of Richard Guy Brigs git repo on branch
> audit-for-next prepping my patch and I noticed a build warning:
>
> kernel/audit.c:832:8: warning: format ‘%A’ expects argument of type
> ‘double’, but argument 3 has type ‘char *’ [-Wformat]
>
> Looking at the code, it looks wrong:
>
> audit_log_format(ab,
"
msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
(char *)data);
The issue appears on the % specifier in there, it picks it up as %.A, which
is of type double. Is this what was intended?
Hmmm, that should have picked up a macro from 06051fbe in
audit-for-next. It should be pre-processed to "%.8560s".
William C Roberts
- RGB
--
Richard Guy Briggs <rbriggs(a)redhat.com>
Senior Software Engineer
Kernel Security
AMER ENG Base Operating Systems
Remote, Ottawa, Canada
Voice: +1.647.777.2635
Internal: (81) 32635
Alt: +1.613.693.0684x3545
8:43 p.m.
On Mon, Oct 28, 2013 at 6:35 PM, Richard Guy Briggs <rgb(a)redhat.com> wrote:
On Mon, Oct 28, 2013 at 04:31:30PM -0700, William Roberts wrote:
> On Mon, Oct 28, 2013 at 4:30 PM, William Roberts
> <bill.c.roberts(a)gmail.com>wrote:
>
> > I've been working off of Richard Guy Brigs git repo on branch
> > audit-for-next prepping my patch and I noticed a build warning:
> >
> > kernel/audit.c:832:8: warning: format ‘%A’ expects argument of type
> > ‘double’, but argument 3 has type ‘char *’ [-Wformat]
> >
> > Looking at the code, it looks wrong:
> >
> > audit_log_format(ab,
> "
> msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
> (char *)data);
>
> The issue appears on the % specifier in there, it picks it up as %.A,
which
> is of type double. Is this what was intended?
Hmmm, that should have picked up a macro from 06051fbe in
audit-for-next. It should be pre-processed to "%.8560s".
> William C Roberts
- RGB
The qoutes are wrong for that.
--
Richard Guy Briggs <rbriggs(a)redhat.com>
Senior Software Engineer
Kernel Security
AMER ENG Base Operating Systems
Remote, Ottawa, Canada
Voice: +1.647.777.2635
Internal: (81) 32635
Alt: +1.613.693.0684x3545
--
Respectfully,
William C Roberts
10:55 p.m.
On Mon, Oct 28, 2013 at 6:43 PM, William Roberts
<bill.c.roberts(a)gmail.com>wrote:
On Mon, Oct 28, 2013 at 6:35 PM, Richard Guy Briggs <rgb(a)redhat.com>wrote:
> On Mon, Oct 28, 2013 at 04:31:30PM -0700, William Roberts wrote:
> > On Mon, Oct 28, 2013 at 4:30 PM, William Roberts
> > <bill.c.roberts(a)gmail.com>wrote:
> >
> > > I've been working off of Richard Guy Brigs git repo on branch
> > > audit-for-next prepping my patch and I noticed a build warning:
> > >
> > > kernel/audit.c:832:8: warning: format ‘%A’ expects argument of type
> > > ‘double’, but argument 3 has type ‘char *’ [-Wformat]
> > >
> > > Looking at the code, it looks wrong:
> > >
> > > audit_log_format(ab,
> > "
> > msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
> > (char *)data);
> >
> > The issue appears on the % specifier in there, it picks it up as %.A,
> which
> > is of type double. Is this what was intended?
>
> Hmmm, that should have picked up a macro from 06051fbe in
> audit-for-next. It should be pre-processed to "%.8560s".
>
> > William C Roberts
>
>
> - RGB
>
>
The qoutes are wrong for that.
Ok I see the value is not a string, but a numeric constant. Dont you need
to do something like this:
diff --git a/kernel/audit.c b/kernel/audit.c
index bf4b1af..81dde3d 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -825,10 +825,12 @@ static int audit_receive_msg(struct sk_buff *skb,
struct nlmsghdr *nlh)
if (err)
break;
}
+#define STR_HELPER(x) #x
+#define STR(x) STR_HELPER(x)
audit_log_common_recv_msg(&ab, msg_type);
if (msg_type != AUDIT_USER_TTY)
audit_log_format(ab,
- "
msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
+ "
msg='%."STR(AUDIT_MESSAGE_TEXT_MAX)"s'",
(char *)data);
else {
int size;
Unless their is some gnu-magic I don't know about.
<snip>
--
Respectfully,
William C Roberts
1:45 p.m.
On Mon, Oct 28, 2013 at 08:55:08PM -0700, William Roberts wrote:
On Mon, Oct 28, 2013 at 6:43 PM, William Roberts
<bill.c.roberts(a)gmail.com>wrote:
> On Mon, Oct 28, 2013 at 6:35 PM, Richard Guy Briggs <rgb(a)redhat.com>wrote:
>> On Mon, Oct 28, 2013 at 04:31:30PM -0700, William Roberts wrote:
>> > On Mon, Oct 28, 2013 at 4:30 PM, William Roberts
>> > <bill.c.roberts(a)gmail.com>wrote:
>> > > I've been working off of Richard Guy Brigs git repo on branch
>> > > audit-for-next prepping my patch and I noticed a build warning:
>> > >
>> > > kernel/audit.c:832:8: warning: format ‘%A’ expects argument of type
>> > > ‘double’, but argument 3 has type ‘char *’ [-Wformat]
>> > >
>> > > Looking at the code, it looks wrong:
>> > >
>> > > audit_log_format(ab,
>> > "
>> > msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
>> > (char *)data);
>> >
>> > The issue appears on the % specifier in there, it picks it up as
>> > %.A, which is of type double. Is this what was intended?
>>
>> Hmmm, that should have picked up a macro from 06051fbe in
>> audit-for-next. It should be pre-processed to "%.8560s".
>>
>> > William C Roberts
>>
>> - RGB
>
> The qoutes are wrong for that.
Ok I see the value is not a string, but a numeric constant. Dont you need
to do something like this:
diff --git a/kernel/audit.c b/kernel/audit.c
index bf4b1af..81dde3d 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -825,10 +825,12 @@ static int audit_receive_msg(struct sk_buff *skb,
struct nlmsghdr *nlh)
if (err)
break;
}
+#define STR_HELPER(x) #x
+#define STR(x) STR_HELPER(x)
audit_log_common_recv_msg(&ab, msg_type);
if (msg_type != AUDIT_USER_TTY)
audit_log_format(ab,
- "
msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
+ "
msg='%."STR(AUDIT_MESSAGE_TEXT_MAX)"s'",
(char *)data);
else {
int size;
Ugh. That's not so easy to read... Slightly longer, how about this?
diff --git a/kernel/audit.c b/kernel/audit.c
index 8378c5e..3f569d1 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -824,11 +824,13 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr
*nlh)
break;
}
audit_log_common_recv_msg(&ab, msg_type);
- if (msg_type != AUDIT_USER_TTY)
- audit_log_format(ab,
- " msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
- (char *)data);
- else {
+ if (msg_type != AUDIT_USER_TTY) {
+ char fmt[64];
+ strcat(fmt, " msg='%.");
+ strcat(fmt, "AUDIT_MESSAGE_TEXT_MAX");
+ strcat(fmt, "s'");
+ audit_log_format(ab, fmt, (char *)data);
+ } else {
int size;
audit_log_format(ab, " data=");
Unless their is some gnu-magic I don't know about.
William C Roberts
- RGB
--
Richard Guy Briggs <rbriggs(a)redhat.com>
Senior Software Engineer
Kernel Security
AMER ENG Base Operating Systems
Remote, Ottawa, Canada
Voice: +1.647.777.2635
Internal: (81) 32635
Alt: +1.613.693.0684x3545
2:25 p.m.
<snip>
Ugh. That's not so easy to read... Slightly longer, how about this?
diff --git a/kernel/audit.c b/kernel/audit.c
index 8378c5e..3f569d1 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -824,11 +824,13 @@ static int audit_receive_msg(struct sk_buff *skb,
struct nlmsghdr *nlh)
break;
}
audit_log_common_recv_msg(&ab, msg_type);
- if (msg_type != AUDIT_USER_TTY)
- audit_log_format(ab,
- "
msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
- (char *)data);
- else {
+ if (msg_type != AUDIT_USER_TTY) {
+ char fmt[64];
+ strcat(fmt, " msg='%.");
+ strcat(fmt, "AUDIT_MESSAGE_TEXT_MAX");
+ strcat(fmt, "s'");
+ audit_log_format(ab, fmt, (char *)data);
+ } else {
int size;
audit_log_format(ab, " data=");
I am ok with this. In fact I was going to do this the first time, but I
thought their would be some explicit reason to avoid the additional
run time overhead as the concat could be made at compile time.
<snip>
11:24 a.m.
On Thu, Oct 31, 2013 at 12:25:55PM -0700, William Roberts wrote:
> + if (msg_type != AUDIT_USER_TTY) {
> + char fmt[64];
> + strcat(fmt, " msg='%.");
> + strcat(fmt, "AUDIT_MESSAGE_TEXT_MAX");
> + strcat(fmt, "s'");
> + audit_log_format(ab, fmt, (char *)data);
> + } else {
I am ok with this. In fact I was going to do this the first time, but I
thought their would be some explicit reason to avoid the additional
run time overhead as the concat could be made at compile time.
Ok, this was in danger of starting with fmt in an unknown state. Latest
patch:
diff --git a/kernel/audit.c b/kernel/audit.c
@@ -148,6 +148,8 @@ DEFINE_MUTEX(audit_cmd_mutex);
* should be at least that large. */
#define AUDIT_BUFSIZ 1024
+char usermsg_format[64] = "";
+
/* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
* audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
#define AUDIT_MAXFREE (2*NR_CPUS)
@@ -714,11 +716,15 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr
*nlh)
break;
}
audit_log_common_recv_msg(&ab, msg_type);
- if (msg_type != AUDIT_USER_TTY)
- audit_log_format(ab,
- " msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
+ if (msg_type != AUDIT_USER_TTY) {
+ if (unlikely(usermsg_format[0] == 0))
+ snprintf(usermsg_format,
+ sizeof(usermsg_format),
+ " msg=\'%%.%ds\'",
+ AUDIT_MESSAGE_TEXT_MAX);
+ audit_log_format(ab, usermsg_format,
(char *)data);
- else {
+ } else {
int size;
audit_log_format(ab, " data=");
- RGB
--
Richard Guy Briggs <rbriggs(a)redhat.com>
Senior Software Engineer
Kernel Security
AMER ENG Base Operating Systems
Remote, Ottawa, Canada
Voice: +1.647.777.2635
Internal: (81) 32635
Alt: +1.613.693.0684x3545
11:34 a.m.
On Friday, November 01, 2013 12:24:55 PM Richard Guy Briggs wrote:
On Thu, Oct 31, 2013 at 12:25:55PM -0700, William Roberts wrote:
> > + if (msg_type != AUDIT_USER_TTY) {
> > + char fmt[64];
> > + strcat(fmt, " msg='%.");
> > + strcat(fmt,
"AUDIT_MESSAGE_TEXT_MAX");
> > + strcat(fmt, "s'");
> > + audit_log_format(ab, fmt, (char *)data);
> > + } else {
>
> I am ok with this. In fact I was going to do this the first time, but I
> thought their would be some explicit reason to avoid the additional
> run time overhead as the concat could be made at compile time.
Ok, this was in danger of starting with fmt in an unknown state. Latest
patch:
diff --git a/kernel/audit.c b/kernel/audit.c
@@ -148,6 +148,8 @@ DEFINE_MUTEX(audit_cmd_mutex);
* should be at least that large. */
#define AUDIT_BUFSIZ 1024
+char usermsg_format[64] = "";
You might want this ^^^ to be static so its not global in scope.
-Steve
/* AUDIT_MAXFREE is the number of empty audit_buffers we keep on
the
* audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
#define AUDIT_MAXFREE (2*NR_CPUS)
@@ -714,11 +716,15 @@ static int audit_receive_msg(struct sk_buff *skb,
struct nlmsghdr *nlh) break;
}
audit_log_common_recv_msg(&ab, msg_type);
- if (msg_type != AUDIT_USER_TTY)
- audit_log_format(ab,
- " msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
+ if (msg_type != AUDIT_USER_TTY) {
+ if (unlikely(usermsg_format[0] == 0))
+ snprintf(usermsg_format,
+ sizeof(usermsg_format),
+ " msg=\'%%.%ds\'",
+ AUDIT_MESSAGE_TEXT_MAX);
+ audit_log_format(ab, usermsg_format,
(char *)data);
- else {
+ } else {
int size;
audit_log_format(ab, " data=");
- RGB
--
Richard Guy Briggs <rbriggs(a)redhat.com>
Senior Software Engineer
Kernel Security
AMER ENG Base Operating Systems
Remote, Ottawa, Canada
Voice: +1.647.777.2635
Internal: (81) 32635
Alt: +1.613.693.0684x3545
--
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Linux-audit(a)redhat.com
https://www.redhat.com/mailman/listinfo/linux-audit
11:38 a.m.
On Fri, Nov 01, 2013 at 12:34:55PM -0400, Steve Grubb wrote:
On Friday, November 01, 2013 12:24:55 PM Richard Guy Briggs wrote:
> On Thu, Oct 31, 2013 at 12:25:55PM -0700, William Roberts wrote:
> > > + if (msg_type != AUDIT_USER_TTY) {
> > > + char fmt[64];
> > > + strcat(fmt, " msg='%.");
> > > + strcat(fmt,
"AUDIT_MESSAGE_TEXT_MAX");
> > > + strcat(fmt, "s'");
> > > + audit_log_format(ab, fmt, (char *)data);
> > > + } else {
> >
> > I am ok with this. In fact I was going to do this the first time, but I
> > thought their would be some explicit reason to avoid the additional
> > run time overhead as the concat could be made at compile time.
>
> Ok, this was in danger of starting with fmt in an unknown state. Latest
> patch:
>
> diff --git a/kernel/audit.c b/kernel/audit.c
> @@ -148,6 +148,8 @@ DEFINE_MUTEX(audit_cmd_mutex);
> * should be at least that large. */
> #define AUDIT_BUFSIZ 1024
>
> +char usermsg_format[64] = "";
You might want this ^^^ to be static so its not global in scope.
Yup, good point. Thanks.
-Steve
> /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
> * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
> #define AUDIT_MAXFREE (2*NR_CPUS)
> @@ -714,11 +716,15 @@ static int audit_receive_msg(struct sk_buff *skb,
> struct nlmsghdr *nlh) break;
> }
> audit_log_common_recv_msg(&ab, msg_type);
> - if (msg_type != AUDIT_USER_TTY)
> - audit_log_format(ab,
> - " msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
> + if (msg_type != AUDIT_USER_TTY) {
> + if (unlikely(usermsg_format[0] == 0))
> + snprintf(usermsg_format,
> + sizeof(usermsg_format),
> + " msg=\'%%.%ds\'",
> + AUDIT_MESSAGE_TEXT_MAX);
> + audit_log_format(ab, usermsg_format,
> (char *)data);
> - else {
> + } else {
> int size;
>
> audit_log_format(ab, " data=");
>
> - RGB
>
> --
> Richard Guy Briggs <rbriggs(a)redhat.com>
> Senior Software Engineer
> Kernel Security
> AMER ENG Base Operating Systems
> Remote, Ottawa, Canada
> Voice: +1.647.777.2635
> Internal: (81) 32635
> Alt: +1.613.693.0684x3545
>
> --
> Linux-audit mailing list
> Linux-audit(a)redhat.com
> https://www.redhat.com/mailman/listinfo/linux-audit
- RGB
--
Richard Guy Briggs <rbriggs(a)redhat.com>
Senior Software Engineer
Kernel Security
AMER ENG Base Operating Systems
Remote, Ottawa, Canada
Voice: +1.647.777.2635
Internal: (81) 32635
Alt: +1.613.693.0684x3545
2:57 p.m.
On Fri, Nov 01, 2013 at 12:38:15PM -0400, Richard Guy Briggs wrote:
On Fri, Nov 01, 2013 at 12:34:55PM -0400, Steve Grubb wrote:
> On Friday, November 01, 2013 12:24:55 PM Richard Guy Briggs wrote:
> > On Thu, Oct 31, 2013 at 12:25:55PM -0700, William Roberts wrote:
> > +char usermsg_format[64] = "";
>
> You might want this ^^^ to be static so its not global in scope.
Yup, good point. Thanks.
Better yet, make it local to that if statement, but Eric Paris has a far
more readable and elegant solution:
diff --git a/kernel/audit.c b/kernel/audit.c
@@ -864,8 +864,8 @@ static int audit_receive_msg(struct sk_buff *skb,
struct nlmsghdr *nlh)
}
audit_log_common_recv_msg(&ab, msg_type);
if (msg_type != AUDIT_USER_TTY)
- audit_log_format(ab,
- "
msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
+ audit_log_format(ab, " msg='%.*s'",
+ AUDIT_MESSAGE_TEXT_MAX,
(char *)data);
else {
int size;
I forgot about the * format specifier...
> -Steve
>
> > - RGB
- RGB
- RGB
--
Richard Guy Briggs <rbriggs(a)redhat.com>
Senior Software Engineer
Kernel Security
AMER ENG Base Operating Systems
Remote, Ottawa, Canada
Voice: +1.647.777.2635
Internal: (81) 32635
Alt: +1.613.693.0684x3545
5:10 p.m.
On Nov 1, 2013 12:58 PM, "Richard Guy Briggs" <rgb(a)redhat.com> wrote:
On Fri, Nov 01, 2013 at 12:38:15PM -0400, Richard Guy Briggs wrote:
> On Fri, Nov 01, 2013 at 12:34:55PM -0400, Steve Grubb wrote:
> > On Friday, November 01, 2013 12:24:55 PM Richard Guy Briggs wrote:
> > > On Thu, Oct 31, 2013 at 12:25:55PM -0700, William Roberts wrote:
> > > +char usermsg_format[64] = "";
> >
> > You might want this ^^^ to be static so its not global in scope.
>
> Yup, good point. Thanks.
Better yet, make it local to that if statement, but Eric Paris has a far
more readable and elegant solution:
diff --git a/kernel/audit.c b/kernel/audit.c
@@ -864,8 +864,8 @@ static int audit_receive_msg(struct sk_buff *skb,
struct nlmsghdr *nlh)
}
audit_log_common_recv_msg(&ab, msg_type);
if (msg_type != AUDIT_USER_TTY)
- audit_log_format(ab,
- "
msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
+ audit_log_format(ab, "
msg='%.*s'",
+ AUDIT_MESSAGE_TEXT_MAX,
(char *)data);
else {
int size;
I forgot about the * format specifier...
Yeah me too... I think everyone does :-)
> > -Steve
> >
> > > - RGB
>
> - RGB
- RGB
--
Richard Guy Briggs <rbriggs(a)redhat.com>
Senior Software Engineer
Kernel Security
AMER ENG Base Operating Systems
Remote, Ottawa, Canada
Voice: +1.647.777.2635
Internal: (81) 32635
Alt: +1.613.693.0684x3545
--
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5:20 p.m.
unsubscribe
From: William Roberts
<bill.c.roberts@gmail.com<mailto:bill.c.roberts@gmail.com>>
Date: Friday, November 1, 2013 at 5:10 PM
To: Richard Guy Briggs <rgb@redhat.com<mailto:rgb@redhat.com>>
Cc: "linux-audit@redhat.com<mailto:linux-audit@redhat.com>"
<linux-audit@redhat.com<mailto:linux-audit@redhat.com>>
Subject: Re: Format specifier issue when building kernel
On Nov 1, 2013 12:58 PM, "Richard Guy Briggs"
<rgb@redhat.com<mailto:rgb@redhat.com>> wrote:
On Fri, Nov 01, 2013 at 12:38:15PM -0400, Richard Guy Briggs wrote:
> On Fri, Nov 01, 2013 at 12:34:55PM -0400, Steve Grubb wrote:
> > On Friday, November 01, 2013 12:24:55 PM Richard Guy Briggs wrote:
> > > On Thu, Oct 31, 2013 at 12:25:55PM -0700, William Roberts wrote:
> > > +char usermsg_format[64] = "";
> >
> > You might want this ^^^ to be static so its not global in scope.
>
> Yup, good point. Thanks.
Better yet, make it local to that if statement, but Eric Paris has a far
more readable and elegant solution:
diff --git a/kernel/audit.c b/kernel/audit.c
@@ -864,8 +864,8 @@ static int audit_receive_msg(struct sk_buff *skb,
struct nlmsghdr *nlh)
}
audit_log_common_recv_msg(&ab, msg_type);
if (msg_type != AUDIT_USER_TTY)
- audit_log_format(ab,
- "
msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
+ audit_log_format(ab, " msg='%.*s'",
+ AUDIT_MESSAGE_TEXT_MAX,
(char *)data);
else {
int size;
I forgot about the * format specifier...
Yeah me too... I think everyone does :-)
> > -Steve
> >
> > > - RGB
>
> - RGB
- RGB
--
Richard Guy Briggs <rbriggs@redhat.com<mailto:rbriggs@redhat.com>>
Senior Software Engineer
Kernel Security
AMER ENG Base Operating Systems
Remote, Ottawa, Canada
Voice: +1.647.777.2635
Internal: (81) 32635
Alt: +1.613.693.0684x3545
--
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https://www.redhat.com/mailman/listinfo/linux-audit
5:22 p.m.
FYI... Sending unsubscribe to this list doest work.
On Nov 1, 2013 3:20 PM, "David Rebman" <drebman(a)nexuminc.com> wrote:
unsubscribe
From: William Roberts <bill.c.roberts(a)gmail.com>
Date: Friday, November 1, 2013 at 5:10 PM
To: Richard Guy Briggs <rgb(a)redhat.com>
Cc: "linux-audit(a)redhat.com" <linux-audit(a)redhat.com>
Subject: Re: Format specifier issue when building kernel
On Nov 1, 2013 12:58 PM, "Richard Guy Briggs" <rgb(a)redhat.com> wrote:
>
> On Fri, Nov 01, 2013 at 12:38:15PM -0400, Richard Guy Briggs wrote:
> > On Fri, Nov 01, 2013 at 12:34:55PM -0400, Steve Grubb wrote:
> > > On Friday, November 01, 2013 12:24:55 PM Richard Guy Briggs wrote:
> > > > On Thu, Oct 31, 2013 at 12:25:55PM -0700, William Roberts wrote:
> > > > +char usermsg_format[64] = "";
> > >
> > > You might want this ^^^ to be static so its not global in scope.
> >
> > Yup, good point. Thanks.
>
> Better yet, make it local to that if statement, but Eric Paris has a far
> more readable and elegant solution:
>
> diff --git a/kernel/audit.c b/kernel/audit.c
> @@ -864,8 +864,8 @@ static int audit_receive_msg(struct sk_buff *skb,
> struct nlmsghdr *nlh)
> }
> audit_log_common_recv_msg(&ab, msg_type);
> if (msg_type != AUDIT_USER_TTY)
> - audit_log_format(ab,
> - "
msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
> + audit_log_format(ab, "
msg='%.*s'",
> + AUDIT_MESSAGE_TEXT_MAX,
> (char *)data);
> else {
> int size;
>
> I forgot about the * format specifier...
Yeah me too... I think everyone does :-)
>
> > > -Steve
> > >
> > > > - RGB
> >
> > - RGB
>
> - RGB
>
> --
> Richard Guy Briggs <rbriggs(a)redhat.com>
> Senior Software Engineer
> Kernel Security
> AMER ENG Base Operating Systems
> Remote, Ottawa, Canada
> Voice: +1.647.777.2635
> Internal: (81) 32635
> Alt: +1.613.693.0684x3545
>
> --
> Linux-audit mailing list
> Linux-audit(a)redhat.com
> https://www.redhat.com/mailman/listinfo/linux-audit
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13 comments
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participants (4)
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David Rebman -
Richard Guy Briggs -
Steve Grubb -
William Roberts