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Make pstore permissions more versatile by removing CAP_SYSLOG requirement

Browse source 
and defining more restrictive root directory DAC permissions default
 (0750, which can be adjust after boot unlike the CAP_SYSLOG check).
 Suggested by Nick Kralevich.
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 Comment: Kees Cook <kees@outflux.net>
 
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Merge tag 'pstore-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull pstore update from Kees Cook:
 "Make pstore permissions more versatile by removing CAP_SYSLOG
  requirement and defining more restrictive root directory DAC
  permissions default (0750, which can be adjust after boot unlike the
  CAP_SYSLOG check).

  Suggested by Nick Kralevich"

* tag 'pstore-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  Revert "pstore: Honor dmesg_restrict sysctl on dmesg dumps"
  pstore: Make default pstorefs root dir perms 0750
This commit is contained in:
Linus Torvalds 2017-09-07 19:58:56 -07:00
commit 21d236bf2b
3 changed files with 2 additions and 34 deletions
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3
kernel/printk/printk.c
View file

@ -649,7 +649,7 @@ static int syslog_action_restricted(int type)
type != SYSLOG_ACTION_SIZE_BUFFER;
}
int check_syslog_permissions(int type, int source)
static int check_syslog_permissions(int type, int source)
{
/*
* If this is from /proc/kmsg and we've already opened it, then we've
@ -677,7 +677,6 @@ int check_syslog_permissions(int type, int source)
ok:
return security_syslog(type);
}
EXPORT_SYMBOL_GPL(check_syslog_permissions);
static void append_char(char **pp, char *e, char c)
{