[Bug 259625] fdescfs: file descriptors with O_EXEC give EACCESS when opened

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 259625] fexecve interacts incorrectly with interpreters"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 03 Nov 2021 11:14:58 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259625

--- Comment #5 from Konstantin Belousov <kib@FreeBSD.org> ---
(In reply to Drew DeVault from comment #4)
This example might be surprising initially, but it is not.  Issue is that
O_RDONLY is zero, so O_EXEC | O_RDONLY == O_EXEC.  Then, when you try to open
fdescfd node, it checks for READ permission (since O_RDONLY is zero and no
permissions implies READ), but sees that fd is opened for EXEC only.

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