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pstore: Honor dmesg_restrict sysctl on dmesg dumps

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When the kernel.dmesg_restrict restriction is in place, only users with
CAP_SYSLOG should be able to access crash dumps (like: attacker is
trying to exploit a bug, watchdog reboots, attacker can happily read
crash dumps and logs).

This puts the restriction on console-* types as well as sensitive
information could have been leaked there.

Other log types are unaffected.

Signed-off-by: Sebastian Schmidt <[email protected]>
Acked-by: Kees Cook <[email protected]>
Signed-off-by: Tony Luck <[email protected]>
This commit is contained in:
Sebastian Schmidt 2014-10-19 20:05:15 +02:00 • committed by Tony Luck
commit 68c4a4f8ab
3 changed files with 24 additions and 1 deletions
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2
kernel/printk/printk.c
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@ -480,7 +480,7 @@ static int syslog_action_restricted(int type)
type != SYSLOG_ACTION_SIZE_BUFFER;
}
static int check_syslog_permissions(int type, bool from_file)
int check_syslog_permissions(int type, bool from_file)
{
/*
* If this is from /proc/kmsg and we've already opened it, then we've