git: 9c18d55a768a - main - fexecve(2): call out a scenario where you want !O_EXEC

The branch main has been updated by kevans:

URL: https://cgit.FreeBSD.org/src/commit/?id=9c18d55a768a3e60ecaba1325e9a3e00a25dee26

commit 9c18d55a768a3e60ecaba1325e9a3e00a25dee26
Author:     Kyle Evans <kevans@FreeBSD.org>
AuthorDate: 2026-05-01 03:02:55 +0000
Commit:     Kyle Evans <kevans@FreeBSD.org>
CommitDate: 2026-05-01 03:02:55 +0000

    fexecve(2): call out a scenario where you want !O_EXEC
    
    We note a reason why you might need it, but there's an equally important
    reason you may need to omit it: interpreted programs.  Add a note
    accordingly, along with the workaround configuration if there's reason
    you can't help it.
    
    PR:             294780
    Reviewed by:    Jan Bramkamp <crest_freebsd_rlwinm.de>, kib
    Differential Revision:  https://reviews.freebsd.org/D56704
---
 lib/libsys/execve.2 | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/lib/libsys/execve.2 b/lib/libsys/execve.2
index dc85b9321e48..5562e198239a 100644
--- a/lib/libsys/execve.2
+++ b/lib/libsys/execve.2
@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd July 02, 2025
+.Dd April 29, 2026
 .Dt EXECVE 2
 .Os
 .Sh NAME
@@ -232,6 +232,17 @@ is to use the
 .Dv O_EXEC
 flag when opening
 .Fa fd .
+Opening without
+.Dv O_EXEC
+may be necessary in the case of executing an interpreted program, as the
+interpreter will not be able to acquire a descriptor to the script for reading
+without mounting
+.Xr fdescfs 4
+on
+.Pa /dev/fd
+with the
+.Cm nodup
+option.
 Note that the file to be executed can not be open for writing.
 .Sh RETURN VALUES
 As the