Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-14 08:02:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

Printk fixes for 5.11-rc5

Browse Source 
-----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCAAdFiEESH4wyp42V4tXvYsjUqAMR0iAlPIFAmAJmRwACgkQUqAMR0iA
 lPLxAxAAgBEj8XqRiQh51mDyGCFkHR0NJ2WqSRa50HHhw/mCipwl40jwTsOol2xs
 REodcmswBBvZVApqtWlN+U24j3VaU0gyjpt9ndfkkG9c5PeKlpryGnlABd4Zw3SP
 m8NHkO2rQtdAgVm6AaNd17mYXtZV9a820SNhiDrqxylNDHR1DJW31MoQTpyY4SqE
 zcFyOFabA/zAc869IEnbpiZ8AO6n1lQCJa0C+D+mI70jgy7YEmD0eGkxRTpjoMDS
 ms/iTjelxfWHsuNzQ+85q/931hdz53/Ri3a+HHjDVZSL/e/yxRyr9sOM0XLPVQDy
 2xoHbqTZo4YCYaWSj0ePuW9Sl2yzxuuDtovNEUyssjP+22YV9en9qiHgViZqW9HN
 saruWYZytnpGp4YMFChgen4rxd7jbdxZZzaYOJdJWy2aRn3MfDXrg7aO97MhU4HS
 TeHGee430VYrUc28Nzhnd+wGyAtPDVlGSnZdT+AIo+Uv4a4iK8ULv/58mTM2DvrJ
 Nzln/pwSBf7ddarO8pvdAggmsBAxyBEQ8NUPbeSwiZ2BEIRnO+hT7mDLZ/6TNY83
 jeBDZP7hxo5MfDMhUPkoTdxlZxETnHFrihopChcHjtw+Gz1mb27n1iFactWaLirg
 J+E+/dKbdmxtcKyT3NoqGvcEj08pk/ImtuCPK11b23CzUFTkLrk=
 =l1hI
 -----END PGP SIGNATURE-----

Merge tag 'printk-for-5.11-printk-rework-fixup' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

Pull printk fixes from Petr Mladek:

 - Fix line counting and buffer size calculation. Both regressions
   caused that a reader buffer might not get filled as much as possible.

 - Restore non-documented behavior of printk() reader API and make it
   official.

   It did not fill the last byte of the provided buffer before 5.10. Two
   architectures, powerpc and um, used it to add the trailing '\0'.
   There might theoretically be more callers depending on this behavior
   in userspace.

* tag 'printk-for-5.11-printk-rework-fixup' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  printk: fix buffer overflow potential for print_text()
  printk: fix kmsg_dump_get_buffer length calulations
  printk: ringbuffer: fix line counting
This commit is contained in:
Linus Torvalds 2021-01-21 11:37:22 -08:00
commit 2561bbbe2e
2 changed files with 30 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
kernel/printk/printk.c
View File

@ -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;
}

2
kernel/printk/printk_ringbuffer.c
View File

@ -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)