openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

Printk urgent fixup for 5.11-rc6 

-----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCAAdFiEESH4wyp42V4tXvYsjUqAMR0iAlPIFAmAOyaUACgkQUqAMR0iA
 lPJmKw//cBHluHINQnKgGMfbdjyJilIm2Atd5jm95ysmblXjgAzbB8AJqnKFqhmH
 hC+YiTCa7t84tw2Vh2NpTnosRFjdq8jtjjFpGlqLuLoREprSSRRmKyOob15XIm5d
 5aio1Vh9ks+VoWwHUFfc6zyJuTNGfwRPWgIxA9KdQvt4C8+M3IiQjT3UcdXYzWOB
 Of74rBLZzlImRasL9SFW06oLxZN02CSsA3I49D37WezHFRJ0LlptVPAOVbmTsPXa
 WnX7Q8xOe70WsFH23so7+4H4mieSpkBqNz/+WHFBAekohae0BW5nnK84Nl9+uuUh
 3FF28fXZW3xyGd5JmmBD70tVCV/nUKTSOrkc6Eo0dcrwpwxq+R1wPAojgSUgru8L
 1em015/kRC1DRejCr1mdT3muySQF9gQ7/nEa+7cpo4bqmUb36TNN1pS9OjJMg4/7
 4ZgoKB2lQ1UfueDqiPMgDz/JJ91jRcUCkB86MotyaOGO7FI8oaRSuSp8rvorQ13n
 5LEHV8sX1ENIcu9jTcqN4oxEBg8dXVkxHwLFqWB283Rugk21L0f1IYbUbRPH4RF1
 L5AVoaWBxA6ftXDI/OywszrWtr93sDqcmdebmqT0CTXOiHtTqt2cad8InjWHDh4h
 wtIdV22ak7glMLR0DdMAPKjggjzHsXJLMy9SsowEKVzDN52jVcs=
 =pBad
 -----END PGP SIGNATURE-----

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

Pull printk fix from Petr Mladek:
 "The fix of a potential buffer overflow in 5.11-rc5 introduced another
  one. The trailing '\0' might be written up to the message "len" past
  the buffer. Fortunately, it is not that easy to hit.

  Most readers use 1kB buffers for a single message. Typical messages
  fit into the temporary buffer with enough reserve.

  Also readers do not rely on the '\0'. It is related to the previous
  fix. Some readers required the space for the trailing '\0'. We decided
  to write it there to avoid such regressions in the future.

  The most realistic victims are dumpers using kmsg_dump_get_buffer().
  They are filling the entire buffer with as many messages as possible.
  They are typically used when handling panic()"

* tag 'printk-for-5.11-urgent-fixup' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  printk: fix string termination for record_print_text()
This commit is contained in:
Linus Torvalds 2021-01-25 10:19:40 -08:00
parent 6ee1d745b7 61bb17da44
commit 007ad27d7b
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/printk/printk.c
View File

@ -1398,7 +1398,7 @@ static size_t record_print_text(struct printk_record *r, bool syslog,
* not counted in the return value.
*/
if (buf_size > 0)
text[len] = 0;
r->text_buf[len] = 0;
return len;
}