git: f1cf1447e56a - stable/15 - exec: Avoid overflow when computing the size of the exec map

The branch stable/15 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=f1cf1447e56a5998c7e6db1b9668c4da77911be4

commit f1cf1447e56a5998c7e6db1b9668c4da77911be4
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2026-07-21 22:30:53 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2026-08-06 12:52:27 +0000

    exec: Avoid overflow when computing the size of the exec map
    
    On a test system with 1024 cores the size of exec map exceeds 4GB, and
    all of the operands in the size calculation are 32-bit integers.
    
    Tested by:      Jim Huang Chen <jim.chen.1827@gmail.com>
    MFC after:      1 week
    Sponsored by:   AMD (hardware)
    
    (cherry picked from commit 2efe148a2a321d4c9ed46bdb166f710b2cb21529)
---
 sys/vm/vm_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/vm/vm_init.c b/sys/vm/vm_init.c
index 99eb3b4a57af..d81fab854199 100644
--- a/sys/vm/vm_init.c
+++ b/sys/vm/vm_init.c
@@ -276,7 +276,7 @@ again:
 	exec_map_entry_size = round_page(PATH_MAX + ARG_MAX);
 	exec_map_guard_pages = 1;
 	TUNABLE_INT_FETCH("vm.exec_map_guard_pages", &exec_map_guard_pages);
-	size = exec_map_entries *
+	size = (vm_size_t)exec_map_entries *
 	    (exec_map_entry_size + 2 * ptoa(exec_map_guard_pages)) +
 	    64 * PAGE_SIZE;
 	kmem_subinit(exec_map, kernel_map, &minaddr, &maxaddr, size, false);