git: 0f434b2b5060 - main - rtld: require MAP_GUARD support

The branch main has been updated by brooks:

URL: https://cgit.FreeBSD.org/src/commit/?id=0f434b2b5060b9898229a1b33a10d06616119257

commit 0f434b2b5060b9898229a1b33a10d06616119257
Author:     Brooks Davis <brooks@FreeBSD.org>
AuthorDate: 2025-08-11 11:16:40 +0000
Commit:     Brooks Davis <brooks@FreeBSD.org>
CommitDate: 2025-08-11 11:18:51 +0000

    rtld: require MAP_GUARD support
    
    MAP_GUARD was added prior to 12.0.  We don't support such old kernels in
    userspace so drop the support.
    
    Reviewed by:    kib
    Differential Revision:  https://reviews.freebsd.org/D50731
---
 libexec/rtld-elf/map_object.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/libexec/rtld-elf/map_object.c b/libexec/rtld-elf/map_object.c
index c6a98b50a165..5e5774c0b017 100644
--- a/libexec/rtld-elf/map_object.c
+++ b/libexec/rtld-elf/map_object.c
@@ -25,7 +25,6 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#define _WANT_P_OSREL
 #include <sys/param.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
@@ -43,8 +42,6 @@ static Elf_Ehdr *get_elf_header(int, const char *, const struct stat *,
     Elf_Phdr **phdr);
 static int convert_flags(int); /* Elf flags -> mmap flags */
 
-int __getosreldate(void);
-
 static bool
 phdr_in_zero_page(const Elf_Ehdr *hdr)
 {
@@ -204,8 +201,7 @@ map_object(int fd, const char *path, const struct stat *sb, bool ismain)
 	    segs[nsegs]->p_memsz);
 	mapsize = base_vlimit - base_vaddr;
 	base_addr = (caddr_t)base_vaddr;
-	base_flags = __getosreldate() >= P_OSREL_MAP_GUARD ?
-	    MAP_GUARD : MAP_PRIVATE | MAP_ANON | MAP_NOCORE;
+	base_flags = MAP_GUARD;
 	if (npagesizes > 1 &&  rtld_round_page(segs[0]->p_filesz) >=
 	    pagesizes[1])
 		base_flags |= MAP_ALIGNED_SUPER;