git: 7a1c336ab9d6 - stable/15 - pdrfork(2) tests: do not rely on (int *)-1 being invalid address

The branch stable/15 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=7a1c336ab9d6ac82ac0942f82449ac53319ce58b

commit 7a1c336ab9d6ac82ac0942f82449ac53319ce58b
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2026-02-15 15:09:48 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-02-21 09:48:58 +0000

    pdrfork(2) tests: do not rely on (int *)-1 being invalid address
    
    (cherry picked from commit d6bf2d14a941a88e27a82a3f91790353e134b8f6)
---
 tests/sys/kern/pdrfork.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tests/sys/kern/pdrfork.c b/tests/sys/kern/pdrfork.c
index 7a560e4fa08d..1003ad9dc746 100644
--- a/tests/sys/kern/pdrfork.c
+++ b/tests/sys/kern/pdrfork.c
@@ -26,8 +26,9 @@
  */
 
 #include <sys/types.h>
-#include <sys/user.h>
+#include <sys/mman.h>
 #include <sys/procdesc.h>
+#include <sys/user.h>
 #include <sys/wait.h>
 
 #include <atf-c.h>
@@ -93,7 +94,12 @@ ATF_TC_BODY(child_gets_no_pidfd, tc)
 ATF_TC_WITHOUT_HEAD(efault);
 ATF_TC_BODY(efault, tc)
 {
-	ATF_REQUIRE_ERRNO(EFAULT, pdrfork((int*)-1, 0, RFPROC | RFPROCDESC) < 0);
+	void *unmapped;
+
+	unmapped = mmap(NULL, PAGE_SIZE, PROT_NONE, MAP_GUARD, -1, 0);
+	ATF_REQUIRE(unmapped != MAP_FAILED);
+	ATF_REQUIRE_ERRNO(EFAULT, pdrfork(unmapped, 0, RFPROC |
+	    RFPROCDESC) < 0);
 }
 
 /* Invalid combinations of flags should return EINVAL */