[PATCH v2] man/man2const/TIOCLINUX.2const: Document CAP_SYS_ADMIN requirement for TIOCL_SETSEL modes

[PATCH v2] man/man2const/TIOCLINUX.2const: Document CAP_SYS_ADMIN requirement for TIOCL_SETSEL modes

[Günther Noack]

CAP_SYS_ADMIN was previously required for the entire TIOCL_SETSEL
subcode, but is now only needed for a subset of the selection modes,
since linux.git 2f83e38a095f (2025-01-13; "tty: Permit some
TIOCL_SETSEL modes without CAP_SYS_ADMIN").

The CAP_SYS_ADMIN requirement for TIOCL_SELMOUSEREPORT was further
corrected in linux.git ee6a44da3c87 (2025-04-11; "tty: Require
CAP_SYS_ADMIN for all usages of TIOCL_SELMOUSEREPORT").

Admittedly, there are kernels where CAP_SYS_ADMIN was briefly not
required for TIOCL_SELMOUSEREPORT, even after Linux v6.7, but this was
a mistake which is now fixed in all up-to-date stable kernels.
Therefore, we still document CAP_SYS_ADMIN as required "since Linux
6.7" in this case.

Link: <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=2f83e38a095f8bf7c6029883d894668b03b9bd93>
Link: <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ee6a44da3c87cf64d67dd02be8c0127a5bf56175>
Signed-off-by: Günther Noack <gnoack3000@gmail.com>
---
 man/man2const/TIOCLINUX.2const | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/man/man2const/TIOCLINUX.2const b/man/man2const/TIOCLINUX.2const
index 61f1c596d..b98a0202b 100644
--- a/man/man2const/TIOCLINUX.2const
+++ b/man/man2const/TIOCLINUX.2const
@@ -72,18 +72,30 @@ may be one of the following operations:
 Select character-by-character.
 The indicated screen characters are highlighted
 and saved in a kernel buffer.
+.IP
+Since Linux 6.7, using this selection mode requires the
+.B CAP_SYS_ADMIN
+capability.
 .TP
 .B TIOCL_SELWORD
 Select word-by-word,
 expanding the selection outwards to align with word boundaries.
 The indicated screen characters are highlighted
 and saved in a kernel buffer.
+.IP
+Since Linux 6.7, using this selection mode requires the
+.B CAP_SYS_ADMIN
+capability.
 .TP
 .B TIOCL_SELLINE
 Select line-by-line,
 expanding the selection outwards to select full lines.
 The indicated screen characters are highlighted
 and saved in a kernel buffer.
+.IP
+Since Linux 6.7, using this selection mode requires the
+.B CAP_SYS_ADMIN
+capability.
 .TP
 .B TIOCL_SELPOINTER
 Show the pointer at position
@@ -118,11 +130,11 @@ If mouse reporting is not enabled for the terminal,
 this operation yields an
 .B EINVAL
 error.
-.RE
 .IP
-Since Linux 6.7, using this subcode requires the
+Since Linux 6.7, using this selection mode requires the
 .B CAP_SYS_ADMIN
 capability.
+.RE
 .TP
 .BR subcode = TIOCL_PASTESEL
 Paste selection.
-- 
2.49.0

Re: [PATCH v2] man/man2const/TIOCLINUX.2const: Document CAP_SYS_ADMIN requirement for TIOCL_SETSEL modes

[Alejandro Colomar]

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Hi Günther,

On Fri, May 02, 2025 at 12:24:03PM +0200, Günther Noack wrote:
> CAP_SYS_ADMIN was previously required for the entire TIOCL_SETSEL
> subcode, but is now only needed for a subset of the selection modes,
> since linux.git 2f83e38a095f (2025-01-13; "tty: Permit some
> TIOCL_SETSEL modes without CAP_SYS_ADMIN").
> 
> The CAP_SYS_ADMIN requirement for TIOCL_SELMOUSEREPORT was further
> corrected in linux.git ee6a44da3c87 (2025-04-11; "tty: Require
> CAP_SYS_ADMIN for all usages of TIOCL_SELMOUSEREPORT").
> 
> Admittedly, there are kernels where CAP_SYS_ADMIN was briefly not
> required for TIOCL_SELMOUSEREPORT, even after Linux v6.7, but this was
> a mistake which is now fixed in all up-to-date stable kernels.
> Therefore, we still document CAP_SYS_ADMIN as required "since Linux
> 6.7" in this case.
> 
> Link: <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=2f83e38a095f8bf7c6029883d894668b03b9bd93>
> Link: <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ee6a44da3c87cf64d67dd02be8c0127a5bf56175>
> Signed-off-by: Günther Noack <gnoack3000@gmail.com>

Thanks!  I've applied the patch.
<https://www.alejandro-colomar.es/src/alx/linux/man-pages/man-pages.git/commit/?h=contrib&id=5889aa978ddc93d31d3c48c29899761ebde3f53d>


Have a lovely day!
Alex

> ---
>  man/man2const/TIOCLINUX.2const | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/man/man2const/TIOCLINUX.2const b/man/man2const/TIOCLINUX.2const
> index 61f1c596d..b98a0202b 100644
> --- a/man/man2const/TIOCLINUX.2const
> +++ b/man/man2const/TIOCLINUX.2const
> @@ -72,18 +72,30 @@ may be one of the following operations:
>  Select character-by-character.
>  The indicated screen characters are highlighted
>  and saved in a kernel buffer.
> +.IP
> +Since Linux 6.7, using this selection mode requires the
> +.B CAP_SYS_ADMIN
> +capability.
>  .TP
>  .B TIOCL_SELWORD
>  Select word-by-word,
>  expanding the selection outwards to align with word boundaries.
>  The indicated screen characters are highlighted
>  and saved in a kernel buffer.
> +.IP
> +Since Linux 6.7, using this selection mode requires the
> +.B CAP_SYS_ADMIN
> +capability.
>  .TP
>  .B TIOCL_SELLINE
>  Select line-by-line,
>  expanding the selection outwards to select full lines.
>  The indicated screen characters are highlighted
>  and saved in a kernel buffer.
> +.IP
> +Since Linux 6.7, using this selection mode requires the
> +.B CAP_SYS_ADMIN
> +capability.
>  .TP
>  .B TIOCL_SELPOINTER
>  Show the pointer at position
> @@ -118,11 +130,11 @@ If mouse reporting is not enabled for the terminal,
>  this operation yields an
>  .B EINVAL
>  error.
> -.RE
>  .IP
> -Since Linux 6.7, using this subcode requires the
> +Since Linux 6.7, using this selection mode requires the
>  .B CAP_SYS_ADMIN
>  capability.
> +.RE
>  .TP
>  .BR subcode = TIOCL_PASTESEL
>  Paste selection.
> -- 
> 2.49.0
> 

-- 
<https://www.alejandro-colomar.es/>

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