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: Thu, 23 Oct 2014 15:26:36 -0400 From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> To: Rusty Russell <rusty@...tcorp.com.au> Cc: Lucas De Marchi <lucas.demarchi@...el.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Josh Poimboeuf <jpoimboe@...hat.com> Subject: [PATCH v2 0/5] module: Remove stop_machine from module unloading Hi, Here is the second version of removing stop_machine() from module unloading patchset. Currently, each module unloading calls stop_machine()s 2 times. One is for safely removing module from lists and one is to check the reference counter. However, both are not necessary for those purposes (required by current implementation). First, we can use RCU for the list operation, we just need a synchronize_rcu right before cleaning up. Second, the reference counter can be checked atomically by using atomic_t, instead of per-cpu module_ref. In v2, the series updated as below; - Fix to initialize return value in 1/5. - Remove module LOCKUP code(v1 4/5). - Split v1 5/5 into replacing module_ref with atomic_t and removing stop_machine patches. - Also, add BUG_ON and WARN_ON for the cases if the reference counter becomes a negative value. Thank you, --- Masami Hiramatsu (5): module: Wait for RCU synchronizing before releasing a module module: Unlink module with RCU synchronizing instead of stop_machine lib/bug: Use RCU list ops for module_bug_list module: Replace module_ref with atomic_t refcnt module: Remove stop_machine from module unloading include/linux/module.h | 16 ------ include/trace/events/module.h | 2 - kernel/module.c | 117 ++++++++++++++++------------------------- lib/bug.c | 20 +++++-- 4 files changed, 63 insertions(+), 92 deletions(-) -- Masami HIRAMATSU Software Platform Research Dpt. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu.pt@...achi.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists