From: Konrad Rzeszutek Wilk <konrad@kernel.org>
To: xen-devel@lists.xenproject.org, ross.lagerwall@citrix.com,
konrad.wilk@oracle.com, julien.grall@arm.com,
sstabellini@kernel.org
Cc: andrew.cooper3@citrix.com, jbeulich@suse.com
Subject: [PATCH v4 01/11] livepatch: Expand check for safe_for_reapply if livepatch has only .rodata.
Date: Wed, 20 Sep 2017 18:31:38 -0400 [thread overview]
Message-ID: <20170920223148.13137-2-konrad.wilk@oracle.com> (raw)
In-Reply-To: <20170920223148.13137-1-konrad.wilk@oracle.com>
If the livepatch has only .rodata sections then it is OK to also
apply/revert/apply the livepatch without having to worry about the
unforseen consequences.
See commit 98b728a7b235c67e210f67f789db5d9eb38ca00c
"livepatch: Disallow applying after an revert" for details.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
Cc: Ross Lagerwall <ross.lagerwall@citrix.com>
v3: First posting.
---
xen/common/livepatch.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/xen/common/livepatch.c b/xen/common/livepatch.c
index 66167a5573..b0dcd415ba 100644
--- a/xen/common/livepatch.c
+++ b/xen/common/livepatch.c
@@ -417,9 +417,12 @@ static int move_payload(struct payload *payload, struct livepatch_elf *elf)
}
}
- /* Only one RW section with non-zero size: .livepatch.funcs */
- if ( rw_buf_cnt == 1 &&
- !strcmp(elf->sec[rw_buf_sec].name, ELF_LIVEPATCH_FUNC) )
+ /*
+ * Only one RW section with non-zero size: .livepatch.funcs,
+ * or only RO sections.
+ */
+ if ( !rw_buf_cnt || (rw_buf_cnt == 1 &&
+ !strcmp(elf->sec[rw_buf_sec].name, ELF_LIVEPATCH_FUNC)) )
payload->safe_to_reapply = true;
out:
xfree(offset);
--
2.13.3
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
next prev parent reply other threads:[~2017-09-20 22:32 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-20 22:31 [PATCH v4] Livepatching patch set for 4.10 Konrad Rzeszutek Wilk
2017-09-20 22:31 ` Konrad Rzeszutek Wilk [this message]
2017-10-05 13:47 ` [PATCH v4 01/11] livepatch: Expand check for safe_for_reapply if livepatch has only .rodata Ross Lagerwall
2017-10-05 13:51 ` Konrad Rzeszutek Wilk
2017-10-05 14:08 ` Ross Lagerwall
2017-09-20 22:31 ` [PATCH v4 02/11] livepatch: Tighten alignment checks Konrad Rzeszutek Wilk
2017-09-20 22:31 ` [PATCH v4 03/11] livepatch: Include sizes when an mismatch occurs Konrad Rzeszutek Wilk
2017-09-21 11:58 ` Jan Beulich
2017-10-05 14:06 ` Ross Lagerwall
2017-09-20 22:31 ` [PATCH v4 04/11] livepatch/arm[32, 64]: Don't load and crash on livepatches loaded with wrong text alignment Konrad Rzeszutek Wilk
2017-09-22 14:05 ` Jan Beulich
2017-10-09 8:35 ` Ross Lagerwall
2017-09-20 22:31 ` [PATCH v4 05/11] alternative/x86/arm32: Align altinstructions (and altinstr_replacement) sections Konrad Rzeszutek Wilk
2017-09-21 12:01 ` Jan Beulich
2017-09-20 22:31 ` [PATCH v4 06/11] mkhex: Move it to tools/misc Konrad Rzeszutek Wilk
2017-09-21 8:56 ` Wei Liu
2017-09-20 22:31 ` [PATCH v4 07/11] livepatch/x86/arm[32, 64]: Force .livepatch.depends section to be uint32_t aligned Konrad Rzeszutek Wilk
2017-10-05 14:11 ` Ross Lagerwall
2017-09-20 22:31 ` [PATCH v4 08/11] livepatch/arm/x86: Rename note_depends symbol from test-cases Konrad Rzeszutek Wilk
2017-09-21 12:05 ` Jan Beulich
2017-09-20 22:31 ` [PATCH v4 09/11] livepatch/tests: Make sure all .livepatch.funcs sections are read-only Konrad Rzeszutek Wilk
2017-09-20 22:31 ` [PATCH v4 10/11] livepatch/arm[32, 64]: Modify .livepatch.funcs section to be RW when patching Konrad Rzeszutek Wilk
2017-09-21 12:16 ` Jan Beulich
2017-09-21 14:58 ` Julien Grall
2017-09-21 15:09 ` Jan Beulich
2017-09-20 22:31 ` [PATCH v4 11/11] livepatch: Declare live patching as a supported feature Konrad Rzeszutek Wilk
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170920223148.13137-2-konrad.wilk@oracle.com \
--to=konrad@kernel.org \
--cc=andrew.cooper3@citrix.com \
--cc=jbeulich@suse.com \
--cc=julien.grall@arm.com \
--cc=konrad.wilk@oracle.com \
--cc=ross.lagerwall@citrix.com \
--cc=sstabellini@kernel.org \
--cc=xen-devel@lists.xenproject.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).