git: a9174861eab9 - main - posixshm largepage_mmap: fix a racy test

The branch main has been updated by brooks:

URL: https://cgit.FreeBSD.org/src/commit/?id=a9174861eab9e786f6873fbe6374a1ac19a5e46a

commit a9174861eab9e786f6873fbe6374a1ac19a5e46a
Author:     Brooks Davis <brooks@FreeBSD.org>
AuthorDate: 2024-01-03 16:39:53 +0000
Commit:     Brooks Davis <brooks@FreeBSD.org>
CommitDate: 2024-01-03 16:39:53 +0000

    posixshm largepage_mmap: fix a racy test
    
    You can't ever safely map a single page and then map a superpage sized
    mapping over it with MAP_FIXED.  Even in a single-threaded program, ASLR
    might mean you land too close to another mapping and on CheriBSD we
    don't allow the initial reservation to grow because doing so requires
    program changes that are hard to automate.
    
    To avoid this, map the entire region we want to use upfront.
    
    Reviewed by:    markj
    Obtained from:  CheriBSD
    Sponsored by:   DARPA
    Differential Revision:  https://reviews.freebsd.org/D43282
---
 tests/sys/posixshm/posixshm_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/sys/posixshm/posixshm_test.c b/tests/sys/posixshm/posixshm_test.c
index efc903d4ee04..ade07a118707 100644
--- a/tests/sys/posixshm/posixshm_test.c
+++ b/tests/sys/posixshm/posixshm_test.c
@@ -1407,7 +1407,7 @@ ATF_TC_BODY(largepage_mmap, tc)
 		ATF_REQUIRE(munmap(addr, ps[i] == 0));
 
 		/* Clobber an anonymous mapping with a superpage. */
-		addr1 = mmap(NULL, ps[0], PROT_READ | PROT_WRITE,
+		addr1 = mmap(NULL, ps[i], PROT_READ | PROT_WRITE,
 		    MAP_ANON | MAP_PRIVATE | MAP_ALIGNED(ffsl(ps[i]) - 1), -1,
 		    0);
 		ATF_REQUIRE_MSG(addr1 != MAP_FAILED,