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* [RFC PATCH 0/2] livepatch: Clear relocation targets on a module removal
@ 2019-07-19 12:28 Miroslav Benes
  2019-07-19 12:28 ` [PATCH 1/2] livepatch: Nullify obj->mod in klp_module_coming()'s error path Miroslav Benes
  2019-07-19 12:28 ` [RFC PATCH 2/2] livepatch: Clear relocation targets on a module removal Miroslav Benes
  0 siblings, 2 replies; 44+ messages in thread
From: Miroslav Benes @ 2019-07-19 12:28 UTC (permalink / raw)
  To: jikos, jpoimboe, pmladek
  Cc: joe.lawrence, live-patching, linux-kernel, Miroslav Benes

The second attempt to resolve the issue reported by Josh last year [1]
and also reported earlier this year again [2]. The first attempt [3]
tried to deny the patched modules to be removed. It did not solve the
issue completely. It would be possible, but we decided to try the
arch-specific approach first, which I am sending now.

Sending early as RFC, because I am leaving on holiday tomorrow and it
would be great if you took a look meanwhile.

- I decided not to CC the arch maintainers yet. If we decide that the
  approach is feasible first on our livepatch side, I will split the
  second patch and resend properly.
- the first patch could go in regardless the rest, I guess.
- I am not sure about the placement in
  klp_cleanup_module_patches_limited(). I think it is the best possible,
  but I would really appreciate double-checking.
- I am also not sure about the naming, so ideas also welcome

Lightly tested on both x86_64 and ppc64le and it looked ok.

[1] 20180602161151.apuhs2dygsexmcg2@treble
[2] 1561019068-132672-1-git-send-email-cj.chengjian@huawei.com
[3] 20180607092949.1706-1-mbenes@suse.cz

Miroslav Benes (2):
  livepatch: Nullify obj->mod in klp_module_coming()'s error path
  livepatch: Clear relocation targets on a module removal

 arch/powerpc/kernel/Makefile    |  1 +
 arch/powerpc/kernel/livepatch.c | 75 +++++++++++++++++++++++++++++++++
 arch/powerpc/kernel/module.h    | 15 +++++++
 arch/powerpc/kernel/module_64.c |  7 +--
 arch/x86/kernel/livepatch.c     | 67 +++++++++++++++++++++++++++++
 include/linux/livepatch.h       |  5 +++
 kernel/livepatch/core.c         | 18 +++++---
 7 files changed, 177 insertions(+), 11 deletions(-)
 create mode 100644 arch/powerpc/kernel/livepatch.c
 create mode 100644 arch/powerpc/kernel/module.h

-- 
2.22.0


^ permalink raw reply	[flat|nested] 44+ messages in thread

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Thread overview: 44+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-07-19 12:28 [RFC PATCH 0/2] livepatch: Clear relocation targets on a module removal Miroslav Benes
2019-07-19 12:28 ` [PATCH 1/2] livepatch: Nullify obj->mod in klp_module_coming()'s error path Miroslav Benes
2019-07-28 19:45   ` Josh Poimboeuf
2019-08-19 11:26     ` Petr Mladek
2019-07-19 12:28 ` [RFC PATCH 2/2] livepatch: Clear relocation targets on a module removal Miroslav Benes
2019-07-22  9:33   ` Petr Mladek
2019-08-14 12:33     ` Miroslav Benes
2019-07-28 20:04   ` Josh Poimboeuf
2019-08-14 11:06     ` Miroslav Benes
2019-08-14 15:12       ` Josh Poimboeuf
2019-08-16  9:46         ` Petr Mladek
2019-08-22 22:36           ` Josh Poimboeuf
2019-08-23  8:13             ` Petr Mladek
2019-08-26 14:54               ` Josh Poimboeuf
2019-08-27 15:05                 ` Joe Lawrence
2019-08-27 15:37                   ` Josh Poimboeuf
2019-09-02 16:13                 ` Miroslav Benes
2019-09-02 17:05                   ` Joe Lawrence
2019-09-03 13:02                     ` Miroslav Benes
2019-09-04  8:49                       ` Petr Mladek
2019-09-04 16:26                         ` Joe Lawrence
2019-09-05  2:50                         ` Josh Poimboeuf
2019-09-05 11:09                           ` Petr Mladek
2019-09-05 11:19                             ` Jiri Kosina
2019-09-05 13:23                               ` Josh Poimboeuf
2019-09-05 13:31                                 ` Jiri Kosina
2019-09-05 13:42                                   ` Josh Poimboeuf
2019-09-05 11:39                             ` Joe Lawrence
2019-09-05 13:08                             ` Josh Poimboeuf
2019-09-05 13:15                               ` Josh Poimboeuf
2019-09-05 13:52                                 ` Petr Mladek
2019-09-05 14:28                                   ` Josh Poimboeuf
2019-09-05 12:03                           ` Miroslav Benes
2019-09-05 12:35                             ` Josh Poimboeuf
2019-09-05 12:49                               ` Miroslav Benes
2019-09-05 11:52                         ` Miroslav Benes
2019-09-05  2:32                       ` Josh Poimboeuf
2019-09-05 12:16                         ` Miroslav Benes
2019-09-05 12:54                           ` Josh Poimboeuf
2019-09-06 12:51                             ` Miroslav Benes
2019-09-06 15:38                               ` Joe Lawrence
2019-09-06 16:45                               ` Josh Poimboeuf
2019-08-26 13:44         ` Nicolai Stange
2019-08-26 15:02           ` Josh Poimboeuf

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