* Issue in man page PR_SET_MDWE.2const
@ 2025-12-24 14:38 Helge Kreutzmann
2025-12-25 20:54 ` Alejandro Colomar
0 siblings, 1 reply; 5+ messages in thread
From: Helge Kreutzmann @ 2025-12-24 14:38 UTC (permalink / raw)
To: alx; +Cc: mario.blaettermann, linux-man
Without further ado, the following was found:
Issue: mapping protections → mapping ?
"New memory mapping protections can't be writable and executable. Non-"
"executable mappings can't become executable."
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Issue in man page PR_SET_MDWE.2const
2025-12-24 14:38 Issue in man page PR_SET_MDWE.2const Helge Kreutzmann
@ 2025-12-25 20:54 ` Alejandro Colomar
2026-01-16 10:11 ` Catalin Marinas
0 siblings, 1 reply; 5+ messages in thread
From: Alejandro Colomar @ 2025-12-25 20:54 UTC (permalink / raw)
To: Florent Revest, Catalin Marinas, Helge Kreutzmann
Cc: mario.blaettermann, linux-man
[-- Attachment #1: Type: text/plain, Size: 1908 bytes --]
Hi Helge, Florent, Catalin,
On Wed, Dec 24, 2025 at 02:38:23PM +0000, Helge Kreutzmann wrote:
> Without further ado, the following was found:
>
> Issue: mapping protections → mapping ?
>
> "New memory mapping protections can't be writable and executable. Non-"
> "executable mappings can't become executable."
That text was added in
commit 457ca4a9ae3eae9835a5c011851c4eb88b49d322
Author: Florent Revest <revest@chromium.org>
Date: Wed Oct 11 13:47:44 2023 +0200
prctl.2: Document PR_SET_MDWE and PR_GET_MDWE
Memory-Deny-Write-Execute is a W^X process control originally introduced
by Joey Gouly. I'm the author of the PR_MDWE_NO_INHERIT flag.
Signed-off-by: Florent Revest <revest@chromium.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
So let's ask the author and reviewer. The manual page says:
$ mansect DESCRIPTION man/man2const/PR_SET_MDWE.2const \
| MANWIDTH=64 man /dev/stdin \
| cat;
PR_SET_MDWE(2const) PR_SET_MDWE(2const)
DESCRIPTION
Set the calling process’ Memory‐Deny‐Write‐Execute protec‐
tion mask. Once protection bits are set, they can not be
changed.
mask must be a bit mask of:
PR_MDWE_REFUSE_EXEC_GAIN
New memory mapping protections can’t be writable
and executable. Non‐executable mappings can’t be‐
come executable.
PR_MDWE_NO_INHERIT (since Linux 6.6)
Do not propagate MDWE protection to child processes
on fork(2). Setting this bit requires setting
PR_MDWE_REFUSE_EXEC_GAIN too.
Linux man‐pages (unreleased) (date) PR_SET_MDWE(2const)
Do you agree with the wording fix proposal?
Have a lovely night!
Alex
--
<https://www.alejandro-colomar.es>
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Issue in man page PR_SET_MDWE.2const
2025-12-25 20:54 ` Alejandro Colomar
@ 2026-01-16 10:11 ` Catalin Marinas
2026-01-16 12:39 ` Alejandro Colomar
0 siblings, 1 reply; 5+ messages in thread
From: Catalin Marinas @ 2026-01-16 10:11 UTC (permalink / raw)
To: Alejandro Colomar
Cc: Florent Revest, Helge Kreutzmann, mario.blaettermann, linux-man
Hi Alejandro,
On Thu, Dec 25, 2025 at 09:54:46PM +0100, Alejandro Colomar wrote:
> On Wed, Dec 24, 2025 at 02:38:23PM +0000, Helge Kreutzmann wrote:
> > Without further ado, the following was found:
> >
> > Issue: mapping protections → mapping ?
> >
> > "New memory mapping protections can't be writable and executable. Non-"
> > "executable mappings can't become executable."
>
> That text was added in
>
> commit 457ca4a9ae3eae9835a5c011851c4eb88b49d322
> Author: Florent Revest <revest@chromium.org>
> Date: Wed Oct 11 13:47:44 2023 +0200
>
> prctl.2: Document PR_SET_MDWE and PR_GET_MDWE
>
> Memory-Deny-Write-Execute is a W^X process control originally introduced
> by Joey Gouly. I'm the author of the PR_MDWE_NO_INHERIT flag.
>
> Signed-off-by: Florent Revest <revest@chromium.org>
> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
> Signed-off-by: Alejandro Colomar <alx@kernel.org>
>
> So let's ask the author and reviewer. The manual page says:
>
> $ mansect DESCRIPTION man/man2const/PR_SET_MDWE.2const \
> | MANWIDTH=64 man /dev/stdin \
> | cat;
> PR_SET_MDWE(2const) PR_SET_MDWE(2const)
>
> DESCRIPTION
> Set the calling process’ Memory‐Deny‐Write‐Execute protec‐
> tion mask. Once protection bits are set, they can not be
> changed.
>
> mask must be a bit mask of:
>
> PR_MDWE_REFUSE_EXEC_GAIN
> New memory mapping protections can’t be writable
> and executable. Non‐executable mappings can’t be‐
> come executable.
>
> PR_MDWE_NO_INHERIT (since Linux 6.6)
> Do not propagate MDWE protection to child processes
> on fork(2). Setting this bit requires setting
> PR_MDWE_REFUSE_EXEC_GAIN too.
>
> Linux man‐pages (unreleased) (date) PR_SET_MDWE(2const)
>
> Do you agree with the wording fix proposal?
Just to make sure I understand, do you want to change "mapping
protections" to "mapping" in the PR_MDWE_REFUSE_EXEC_GAIN description?
Fine by me but I would use "mappings" (plural) instead. It matches the
following sentence.
--
Catalin
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Issue in man page PR_SET_MDWE.2const
2026-01-16 10:11 ` Catalin Marinas
@ 2026-01-16 12:39 ` Alejandro Colomar
2026-01-16 13:38 ` Catalin Marinas
0 siblings, 1 reply; 5+ messages in thread
From: Alejandro Colomar @ 2026-01-16 12:39 UTC (permalink / raw)
To: Catalin Marinas
Cc: Florent Revest, Helge Kreutzmann, mario.blaettermann, linux-man
[-- Attachment #1: Type: text/plain, Size: 3666 bytes --]
Hi Catalin,
On Fri, Jan 16, 2026 at 10:11:03AM +0000, Catalin Marinas wrote:
> Hi Alejandro,
>
> On Thu, Dec 25, 2025 at 09:54:46PM +0100, Alejandro Colomar wrote:
> > On Wed, Dec 24, 2025 at 02:38:23PM +0000, Helge Kreutzmann wrote:
> > > Without further ado, the following was found:
> > >
> > > Issue: mapping protections → mapping ?
> > >
> > > "New memory mapping protections can't be writable and executable. Non-"
> > > "executable mappings can't become executable."
> >
> > That text was added in
> >
> > commit 457ca4a9ae3eae9835a5c011851c4eb88b49d322
> > Author: Florent Revest <revest@chromium.org>
> > Date: Wed Oct 11 13:47:44 2023 +0200
> >
> > prctl.2: Document PR_SET_MDWE and PR_GET_MDWE
> >
> > Memory-Deny-Write-Execute is a W^X process control originally introduced
> > by Joey Gouly. I'm the author of the PR_MDWE_NO_INHERIT flag.
> >
> > Signed-off-by: Florent Revest <revest@chromium.org>
> > Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
> > Signed-off-by: Alejandro Colomar <alx@kernel.org>
> >
> > So let's ask the author and reviewer. The manual page says:
> >
> > $ mansect DESCRIPTION man/man2const/PR_SET_MDWE.2const \
> > | MANWIDTH=64 man /dev/stdin \
> > | cat;
> > PR_SET_MDWE(2const) PR_SET_MDWE(2const)
> >
> > DESCRIPTION
> > Set the calling process’ Memory‐Deny‐Write‐Execute protec‐
> > tion mask. Once protection bits are set, they can not be
> > changed.
> >
> > mask must be a bit mask of:
> >
> > PR_MDWE_REFUSE_EXEC_GAIN
> > New memory mapping protections can’t be writable
> > and executable. Non‐executable mappings can’t be‐
> > come executable.
> >
> > PR_MDWE_NO_INHERIT (since Linux 6.6)
> > Do not propagate MDWE protection to child processes
> > on fork(2). Setting this bit requires setting
> > PR_MDWE_REFUSE_EXEC_GAIN too.
> >
> > Linux man‐pages (unreleased) (date) PR_SET_MDWE(2const)
> >
> > Do you agree with the wording fix proposal?
>
> Just to make sure I understand, do you want to change "mapping
> protections" to "mapping" in the PR_MDWE_REFUSE_EXEC_GAIN description?
I didn't have an opinion. Helge proposed this, and I have no idea
whether the proposal is good or not, which is why I forwarded it to you. :)
> Fine by me but I would use "mappings" (plural) instead. It matches the
> following sentence.
Yes, plural seems more correct. Thanks!
I've applied the following patch:
commit 6352d57d7324d8c6fee2d335f103d8755ea5a620
Author: Alejandro Colomar <alx@kernel.org>
Date: Fri Jan 16 13:37:28 2026 +0100
man/man2const/PR_SET_MDWE.2const: wfix
Reported-by: Helge Kreutzmann <debian@helgefjell.de>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Florent Revest <revest@chromium.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
diff --git a/man/man2const/PR_SET_MDWE.2const b/man/man2const/PR_SET_MDWE.2const
index db75b1873..4749ea5be 100644
--- a/man/man2const/PR_SET_MDWE.2const
+++ b/man/man2const/PR_SET_MDWE.2const
@@ -26,7 +26,7 @@ .SH DESCRIPTION
must be a bit mask of:
.TP
.B PR_MDWE_REFUSE_EXEC_GAIN
-New memory mapping protections can't be writable and executable.
+New memory mappings can't be writable and executable.
Non-executable mappings can't become executable.
.TP
.B PR_MDWE_NO_INHERIT " (since Linux 6.6)"
Have a lovely day!
Alex
--
<https://www.alejandro-colomar.es>
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Issue in man page PR_SET_MDWE.2const
2026-01-16 12:39 ` Alejandro Colomar
@ 2026-01-16 13:38 ` Catalin Marinas
0 siblings, 0 replies; 5+ messages in thread
From: Catalin Marinas @ 2026-01-16 13:38 UTC (permalink / raw)
To: Alejandro Colomar
Cc: Florent Revest, Helge Kreutzmann, mario.blaettermann, linux-man
On Fri, Jan 16, 2026 at 01:39:08PM +0100, Alejandro Colomar wrote:
> I've applied the following patch:
>
> commit 6352d57d7324d8c6fee2d335f103d8755ea5a620
> Author: Alejandro Colomar <alx@kernel.org>
> Date: Fri Jan 16 13:37:28 2026 +0100
>
> man/man2const/PR_SET_MDWE.2const: wfix
>
> Reported-by: Helge Kreutzmann <debian@helgefjell.de>
> Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Florent Revest <revest@chromium.org>
> Signed-off-by: Alejandro Colomar <alx@kernel.org>
>
> diff --git a/man/man2const/PR_SET_MDWE.2const b/man/man2const/PR_SET_MDWE.2const
> index db75b1873..4749ea5be 100644
> --- a/man/man2const/PR_SET_MDWE.2const
> +++ b/man/man2const/PR_SET_MDWE.2const
> @@ -26,7 +26,7 @@ .SH DESCRIPTION
> must be a bit mask of:
> .TP
> .B PR_MDWE_REFUSE_EXEC_GAIN
> -New memory mapping protections can't be writable and executable.
> +New memory mappings can't be writable and executable.
> Non-executable mappings can't become executable.
> .TP
> .B PR_MDWE_NO_INHERIT " (since Linux 6.6)"
Looks good. Thanks!
--
Catalin
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2026-01-16 13:38 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-12-24 14:38 Issue in man page PR_SET_MDWE.2const Helge Kreutzmann
2025-12-25 20:54 ` Alejandro Colomar
2026-01-16 10:11 ` Catalin Marinas
2026-01-16 12:39 ` Alejandro Colomar
2026-01-16 13:38 ` Catalin Marinas
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox