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authorPetr Mladek <pmladek@suse.com>2021-01-21 16:06:21 +0100
committerPetr Mladek <pmladek@suse.com>2021-01-21 16:06:21 +0100
commit535b6a122c6b43af5772ca39cbff7056749aae74 (patch)
tree9b2eda3b3c60581895bf862736b8c761f3325a59
parenta91bd6223ecd46addc71ee6fcd432206d39365d2 (diff)
parentf0e386ee0c0b71ea6f7238506a4d0965a2dbef11 (diff)
Merge branch 'printk-rework' into for-linus
-rw-r--r--kernel/printk/printk.c40
-rw-r--r--kernel/printk/printk_ringbuffer.c2
2 files changed, 30 insertions, 12 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index ffdd0dc7ec6d..6639a0cfe0ac 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1291,11 +1291,16 @@ static size_t info_print_prefix(const struct printk_info *info, bool syslog,
* done:
*
* - Add prefix for each line.
+ * - Drop truncated lines that no longer fit into the buffer.
* - Add the trailing newline that has been removed in vprintk_store().
- * - Drop truncated lines that do not longer fit into the buffer.
+ * - Add a string terminator.
+ *
+ * Since the produced string is always terminated, the maximum possible
+ * return value is @r->text_buf_size - 1;
*
* Return: The length of the updated/prepared text, including the added
- * prefixes and the newline. The dropped line(s) are not counted.
+ * prefixes and the newline. The terminator is not counted. The dropped
+ * line(s) are not counted.
*/
static size_t record_print_text(struct printk_record *r, bool syslog,
bool time)
@@ -1338,26 +1343,31 @@ static size_t record_print_text(struct printk_record *r, bool syslog,
/*
* Truncate the text if there is not enough space to add the
- * prefix and a trailing newline.
+ * prefix and a trailing newline and a terminator.
*/
- if (len + prefix_len + text_len + 1 > buf_size) {
+ if (len + prefix_len + text_len + 1 + 1 > buf_size) {
/* Drop even the current line if no space. */
- if (len + prefix_len + line_len + 1 > buf_size)
+ if (len + prefix_len + line_len + 1 + 1 > buf_size)
break;
- text_len = buf_size - len - prefix_len - 1;
+ text_len = buf_size - len - prefix_len - 1 - 1;
truncated = true;
}
memmove(text + prefix_len, text, text_len);
memcpy(text, prefix, prefix_len);
+ /*
+ * Increment the prepared length to include the text and
+ * prefix that were just moved+copied. Also increment for the
+ * newline at the end of this line. If this is the last line,
+ * there is no newline, but it will be added immediately below.
+ */
len += prefix_len + line_len + 1;
-
if (text_len == line_len) {
/*
- * Add the trailing newline removed in
- * vprintk_store().
+ * This is the last line. Add the trailing newline
+ * removed in vprintk_store().
*/
text[prefix_len + line_len] = '\n';
break;
@@ -1382,6 +1392,14 @@ static size_t record_print_text(struct printk_record *r, bool syslog,
text_len -= line_len + 1;
}
+ /*
+ * If a buffer was provided, it will be terminated. Space for the
+ * string terminator is guaranteed to be available. The terminator is
+ * not counted in the return value.
+ */
+ if (buf_size > 0)
+ text[len] = 0;
+
return len;
}
@@ -3427,7 +3445,7 @@ bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
while (prb_read_valid_info(prb, seq, &info, &line_count)) {
if (r.info->seq >= dumper->next_seq)
break;
- l += get_record_print_text_size(&info, line_count, true, time);
+ l += get_record_print_text_size(&info, line_count, syslog, time);
seq = r.info->seq + 1;
}
@@ -3437,7 +3455,7 @@ bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
&info, &line_count)) {
if (r.info->seq >= dumper->next_seq)
break;
- l -= get_record_print_text_size(&info, line_count, true, time);
+ l -= get_record_print_text_size(&info, line_count, syslog, time);
seq = r.info->seq + 1;
}
diff --git a/kernel/printk/printk_ringbuffer.c b/kernel/printk/printk_ringbuffer.c
index 6704f06e0417..8a7b7362c0dd 100644
--- a/kernel/printk/printk_ringbuffer.c
+++ b/kernel/printk/printk_ringbuffer.c
@@ -1718,7 +1718,7 @@ static bool copy_data(struct prb_data_ring *data_ring,
/* Caller interested in the line count? */
if (line_count)
- *line_count = count_lines(data, data_size);
+ *line_count = count_lines(data, len);
/* Caller interested in the data content? */
if (!buf || !buf_size)