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printk: introduce CONSOLE_LOG_MAX 

Instead of using "LOG_LINE_MAX + PREFIX_MAX" for temporary buffer
sizes, introduce CONSOLE_LOG_MAX. This represents the maximum size
that is allowed to be printed to the console for a single record.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20210303101528.29901-8-john.ogness@linutronix.de
This commit is contained in:
John Ogness 2021-03-03 11:15:20 +01:00 committed by Petr Mladek
parent 4260e0e551
commit cf5b0208fd
1 changed files with 12 additions and 8 deletions
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20
kernel/printk/printk.c
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@ -410,7 +410,12 @@ static u64 clear_seq;
#else
#define PREFIX_MAX 32
#endif
#define LOG_LINE_MAX (1024 - PREFIX_MAX)
/* the maximum size of a formatted record (i.e. with prefix added per line) */
#define CONSOLE_LOG_MAX 1024
/* the maximum size allowed to be reserved for a record */
#define LOG_LINE_MAX (CONSOLE_LOG_MAX - PREFIX_MAX)
#define LOG_LEVEL(v) ((v) & 0x07)
#define LOG_FACILITY(v) ((v) >> 3 & 0xff)
@ -1472,11 +1477,11 @@ static int syslog_print(char __user *buf, int size)
char *text;
int len = 0;
text = kmalloc(LOG_LINE_MAX + PREFIX_MAX, GFP_KERNEL);
text = kmalloc(CONSOLE_LOG_MAX, GFP_KERNEL);
if (!text)
return -ENOMEM;
prb_rec_init_rd(&r, &info, text, LOG_LINE_MAX + PREFIX_MAX);
prb_rec_init_rd(&r, &info, text, CONSOLE_LOG_MAX);
while (size > 0) {
size_t n;
@ -1542,7 +1547,7 @@ static int syslog_print_all(char __user *buf, int size, bool clear)
u64 seq;
bool time;
text = kmalloc(LOG_LINE_MAX + PREFIX_MAX, GFP_KERNEL);
text = kmalloc(CONSOLE_LOG_MAX, GFP_KERNEL);
if (!text)
return -ENOMEM;
@ -1554,7 +1559,7 @@ static int syslog_print_all(char __user *buf, int size, bool clear)
*/
seq = find_first_fitting_seq(clear_seq, -1, size, true, time);
prb_rec_init_rd(&r, &info, text, LOG_LINE_MAX + PREFIX_MAX);
prb_rec_init_rd(&r, &info, text, CONSOLE_LOG_MAX);
len = 0;
prb_for_each_record(seq, prb, seq, &r) {
@ -2187,8 +2192,7 @@ EXPORT_SYMBOL(printk);
#else /* CONFIG_PRINTK */
#define LOG_LINE_MAX 0
#define PREFIX_MAX 0
#define CONSOLE_LOG_MAX 0
#define printk_time false
#define prb_read_valid(rb, seq, r) false
@ -2506,7 +2510,7 @@ static inline int can_use_console(void)
void console_unlock(void)
{
static char ext_text[CONSOLE_EXT_LOG_MAX];
static char text[LOG_LINE_MAX + PREFIX_MAX];
static char text[CONSOLE_LOG_MAX];
unsigned long flags;
bool do_cond_resched, retry;
struct printk_info info;