lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 29 Mar 2017 18:25:09 +0900 From: Sergey Senozhatsky <sergey.senozhatsky@...il.com> To: Steven Rostedt <rostedt@...dmis.org>, Petr Mladek <pmladek@...e.com> Cc: Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Peter Zijlstra <peterz@...radead.org>, "Rafael J . Wysocki" <rjw@...ysocki.net>, Eric Biederman <ebiederm@...ssion.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jslaby@...e.com>, Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>, linux-kernel@...r.kernel.org, Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>, Sergey Senozhatsky <sergey.senozhatsky@...il.com> Subject: [RFC][PATCHv2 6/8] kexec: switch to printk.emergency mode in unsafe places Switch to printk emergency mode in kernel_kexec(), this lets us to immediately flush pending kernel message to the console and to avoid potentially unsafe calls into the scheduler. Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com> --- kernel/kexec_core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index bfe62d5b3872..5684ba36ec15 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -1496,6 +1496,8 @@ int kernel_kexec(void) goto Unlock; } + printk_emergency_begin(); + #ifdef CONFIG_KEXEC_JUMP if (kexec_image->preserve_context) { lock_system_sleep(); @@ -1565,6 +1567,8 @@ int kernel_kexec(void) } #endif + printk_emergency_end(); + Unlock: mutex_unlock(&kexec_mutex); return error; -- 2.12.2
Powered by blists - more mailing lists