git: 06134ea2f38c - main - malloc(9): Check for M_NEVERFREED

[Bojan Novković]

The branch main has been updated by bnovkov:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=06134ea2f38ca214b53a1613e110e8332b2804e4

commit 06134ea2f38ca214b53a1613e110e8332b2804e4
Author:     Bojan Novković <bnov...@freebsd.org>
AuthorDate: 2024-07-31 17:43:31 +0000
Commit:     Bojan Novković <bnov...@freebsd.org>
CommitDate: 2024-08-05 16:44:10 +0000

    malloc(9): Check for M_NEVERFREED
    
    The recently introduced M_NEVERFREED flag is not meant to be used for
    regular malloc requests. Enforce this by checking for M_NEVERFREED
    in malloc_dbg.
    
    Reviewed by:    alc, kib, markj
    Differential Revision:  https://reviews.freebsd.org/D46199
---
 sys/kern/kern_malloc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/kern/kern_malloc.c b/sys/kern/kern_malloc.c
index 3c4cb63003c4..9d7e0464e0f7 100644
--- a/sys/kern/kern_malloc.c
+++ b/sys/kern/kern_malloc.c
@@ -542,6 +542,8 @@ malloc_dbg(caddr_t *vap, size_t *sizep, struct malloc_type 
*mtp,
                        once++;
                }
        }
+       KASSERT((flags & M_NEVERFREED) == 0,
+           ("malloc: M_NEVERFREED is for internal use only"));
 #endif
 #ifdef MALLOC_MAKE_FAILURES
        if ((flags & M_NOWAIT) && (malloc_failure_rate != 0)) {