git: 71ab344524a1 - main - Add sv_onexec_old() sysent hook for exec event

[Konstantin Belousov]

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=71ab344524a14f00f21c4c5638906d7b965d2b64

commit 71ab344524a14f00f21c4c5638906d7b965d2b64
Author:     Konstantin Belousov <kib at FreeBSD.org>
AuthorDate: 2021-07-01 18:04:06 +0000
Commit:     Konstantin Belousov <kib at FreeBSD.org>
CommitDate: 2021-07-07 11:12:07 +0000

    Add sv_onexec_old() sysent hook for exec event
    
    Unlike sv_onexec(), it is called from the old (pre-exec) sysentvec structure.
    The old vmspace for the process is still intact during the call.
    
    Reviewed by:    dchagin, markj
    Sponsored by:   The FreeBSD Foundation
    MFC after:      2 weeks
    Differential revision:  https://reviews.freebsd.org/D30987
---
 sys/kern/kern_exec.c | 2 ++
 sys/sys/sysent.h     | 1 +
 2 files changed, 3 insertions(+)

diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c
index c3c23f44189e..763196a593e4 100644
--- a/sys/kern/kern_exec.c
+++ b/sys/kern/kern_exec.c
@@ -1064,6 +1064,8 @@ exec_new_vmspace(struct image_params *imgp, struct sysentvec *sv)
 
 	sigfastblock_clear(td);
 	umtx_exec(p);
+	if (p->p_sysent->sv_onexec_old != NULL)
+		p->p_sysent->sv_onexec_old(td);
 	itimers_exec(p);
 	if (sv->sv_onexec != NULL)
 		sv->sv_onexec(p, imgp);
diff --git a/sys/sys/sysent.h b/sys/sys/sysent.h
index e0e5e351ae20..869c140c06f5 100644
--- a/sys/sys/sysent.h
+++ b/sys/sys/sysent.h
@@ -150,6 +150,7 @@ struct sysentvec {
 	u_long		*sv_hwcap2;	/* Value passed in AT_HWCAP2. */
 	const char	*(*sv_machine_arch)(struct proc *);
 	vm_offset_t	sv_fxrng_gen_base;
+	void		(*sv_onexec_old)(struct thread *td);
 	void		(*sv_onexec)(struct proc *, struct image_params *);
 	void		(*sv_onexit)(struct proc *);
 	void		(*sv_ontdexit)(struct thread *td);