git: 05492ff6f636 - main - pdwait(2) tests: do not rely on (int *)-1 being invalid address

The branch main has been updated by asomers:

URL: https://cgit.FreeBSD.org/src/commit/?id=05492ff6f636108c4fac40c259defe9b2eac7833

commit 05492ff6f636108c4fac40c259defe9b2eac7833
Author:     Alan Somers <asomers@FreeBSD.org>
AuthorDate: 2026-02-17 00:25:58 +0000
Commit:     Alan Somers <asomers@FreeBSD.org>
CommitDate: 2026-02-17 00:27:38 +0000

    pdwait(2) tests: do not rely on (int *)-1 being invalid address
    
    Explicitly mmap guard and use it as the invalid address instead.
    
    MFC after:      1 week
---
 tests/sys/kern/pdwait.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/tests/sys/kern/pdwait.c b/tests/sys/kern/pdwait.c
index 513b07cae87e..c7b2c40a87ba 100644
--- a/tests/sys/kern/pdwait.c
+++ b/tests/sys/kern/pdwait.c
@@ -27,6 +27,7 @@
 
 #include <sys/types.h>
 #include <sys/capsicum.h>
+#include <sys/mman.h>
 #include <sys/procdesc.h>
 #include <sys/resource.h>
 #include <sys/time.h>
@@ -37,6 +38,16 @@
 #include <signal.h>
 #include <string.h>
 
+static void*
+unmapped(void) {
+	void *unmapped;
+
+	unmapped = mmap(NULL, PAGE_SIZE, PROT_NONE, MAP_GUARD, -1, 0);
+	ATF_REQUIRE(unmapped != MAP_FAILED);
+
+	return(unmapped);
+}
+
 /* basic usage */
 ATF_TC_WITHOUT_HEAD(basic);
 ATF_TC_BODY(basic, tc)
@@ -108,7 +119,8 @@ ATF_TC_BODY(efault1, tc)
 	ATF_REQUIRE_MSG(pid >= 0, "pdfork failed: %s", strerror(errno));
 	ATF_REQUIRE_MSG(fdp >= 0, "pdfork didn't return a process descriptor");
 
-	ATF_CHECK_ERRNO(EFAULT, pdwait(fdp, (int*)-1, WEXITED, NULL, NULL) < 0);
+	ATF_CHECK_ERRNO(EFAULT,
+	    pdwait(fdp, (int*)unmapped(), WEXITED, NULL, NULL) < 0);
 
 	close(fdp);
 }
@@ -127,7 +139,8 @@ ATF_TC_BODY(efault2, tc)
 	ATF_REQUIRE_MSG(fdp >= 0, "pdfork didn't return a process descriptor");
 
 	ATF_CHECK_ERRNO(EFAULT,
-	    pdwait(fdp, NULL, WEXITED, (struct __wrusage*)-1, NULL) < 0);
+	    pdwait(fdp, NULL, WEXITED, (struct __wrusage*)unmapped(), NULL) < 0
+	);
 
 	close(fdp);
 }
@@ -146,7 +159,8 @@ ATF_TC_BODY(efault3, tc)
 	ATF_REQUIRE_MSG(fdp >= 0, "pdfork didn't return a process descriptor");
 
 	ATF_CHECK_ERRNO(EFAULT,
-	    pdwait(fdp, NULL, WEXITED, NULL, (struct __siginfo*)-1) < 0);
+	    pdwait(fdp, NULL, WEXITED, NULL, (struct __siginfo*)unmapped()) < 0
+	);
 
 	close(fdp);
 }