From: Zach OKeefe <zokeefe@google.com>
To: Alejandro Colomar <alx.manpages@gmail.com>,
Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Yang Shi <shy828301@gmail.com>,
linux-mm@kvack.org, linux-man@vger.kernel.org,
"Zach O'Keefe" <zokeefe@google.com>,
Suren Baghdasaryan <surenb@google.com>,
Minchan Kim <minchan@kernel.org>
Subject: [PATCH man-pages v2 3/4] process_madvise.2: CAP_SYS_ADMIN cleanup
Date: Tue, 18 Oct 2022 16:50:50 -0700 [thread overview]
Message-ID: <20221018235051.152548-4-zokeefe@google.com> (raw)
In-Reply-To: <20221018235051.152548-1-zokeefe@google.com>
From: Zach O'Keefe <zokeefe@google.com>
The initial commit of process_madvise(2) to man-pages project included
an error, indicating that CAP_SYS_ADMIN capability was required when, in
fact, CAP_SYS_NICE was the required capability.
The initial commit of process_madvise(2) to Linux, commit ecb8ac8b1f14
("mm/madvise: introduce process_madvise() syscall: an external memory
hinting API"), relied on PTRACE_MODE_ATTACH_FSCREDS (see ptrace(2)),
but was amended by commit 96cfe2c0fd23 ("mm/madvise: replace ptrace
attach requirement for process_madvise") which replaced this with a
combination of PTRACE_MODE_READ and CAP_SYS_NICE (PTRACE_MODE_READ to
prevent leaking ASLR metadata and CAP_SYS_NICE for influencing process
performance).
Correct this in the man-page for process_madvise(2).
Fixes: a144f458b ("process_madvise.2: Document process_madvise(2)")
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Zach O'Keefe <zokeefe@google.com>
---
man2/process_madvise.2 | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/man2/process_madvise.2 b/man2/process_madvise.2
index 6208206e4..7bee1a098 100644
--- a/man2/process_madvise.2
+++ b/man2/process_madvise.2
@@ -113,7 +113,8 @@ check (see
in addition,
because of the performance implications of applying the advice,
the caller must have the
-.B CAP_SYS_ADMIN
+.\" commit 96cfe2c0fd23ea7c2368d14f769d287e7ae1082e
+.B CAP_SYS_NICE
capability.
.SH RETURN VALUE
On success,
--
2.38.0.413.g74048e4d9e-goog
next prev parent reply other threads:[~2022-10-18 23:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-18 23:50 [PATCH man-pages v2 0/4] Add MADV_COLLAPSE documentation Zach OKeefe
2022-10-18 23:50 ` [PATCH man-pages v2 1/4] madvise.2: update THP file/shmem documentation for +5.4 Zach OKeefe
2022-10-18 23:50 ` [PATCH man-pages v2 2/4] madvise.2: document reliable probe for advice support Zach OKeefe
2022-10-18 23:50 ` Zach OKeefe [this message]
2022-10-19 0:11 ` [PATCH man-pages v2 3/4] process_madvise.2: CAP_SYS_ADMIN cleanup Suren Baghdasaryan
2022-10-21 12:37 ` Alejandro Colomar
2022-10-21 12:41 ` Alejandro Colomar
2022-10-21 16:16 ` Zach O'Keefe
2022-10-21 16:30 ` Alejandro Colomar
2022-10-18 23:50 ` [PATCH man-pages v2 4/4] madvise.2: add documentation for MADV_COLLAPSE Zach OKeefe
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=20221018235051.152548-4-zokeefe@google.com \
--to=zokeefe@google.com \
--cc=alx.manpages@gmail.com \
--cc=linux-man@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=minchan@kernel.org \
--cc=mtk.manpages@gmail.com \
--cc=shy828301@gmail.com \
--cc=surenb@google.com \
/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