git: 7938d643d227 - stable/13 - modules: fix freebsd32_modstat on big endian platforms

The branch stable/13 has been updated by khng:

URL: https://cgit.FreeBSD.org/src/commit/?id=7938d643d2275cf95d5734f5895b7e9d00fcb448

commit 7938d643d2275cf95d5734f5895b7e9d00fcb448
Author:     Ka Ho Ng <khng@FreeBSD.org>
AuthorDate: 2023-07-07 04:21:01 +0000
Commit:     Ka Ho Ng <khng@FreeBSD.org>
CommitDate: 2023-07-24 02:01:40 +0000

    modules: fix freebsd32_modstat on big endian platforms
    
    The layout of modspecific_t on both little endian and big endian are as
    follows:
    |0|1|2|3|4|5|6|7|
    +-------+-------+
    |uintval|       |
    +-------+-------+
    |ulongval       |
    +-------+-------+
    
    For the following code snippet:
            CP(mod->data, data32, longval);
            CP(mod->data, data32, ulongval);
    It only takes care of little endian platforms that it truncates the
    highest 32bit automatically. However on big endian platforms it takes
    the highest 32bit instead. This eventually returns a garbage syscall
    number to the 32bit userland.
    
    Since modspecific_t's usage currently is for the use of syscall modules,
    we only initialize modspecific32_t with uintval. Now on both BE and LE
    64-bit platforms it always pick up the first 4 bytes.
    
    Sponsored by:   Juniper Networks, Inc.
    Reviewed by:    markj
    Differential Revision:  https://reviews.freebsd.org/D40814
    MFC after:      1 week
    
    (cherry picked from commit 034c0856018ccf73c0f2d6140825f3edf43f47b2)
---
 sys/kern/kern_module.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/sys/kern/kern_module.c b/sys/kern/kern_module.c
index 1798a834dcec..7128525ddb66 100644
--- a/sys/kern/kern_module.c
+++ b/sys/kern/kern_module.c
@@ -520,10 +520,9 @@ freebsd32_modstat(struct thread *td, struct freebsd32_modstat_args *uap)
 	id = mod->id;
 	refs = mod->refs;
 	name = mod->name;
-	CP(mod->data, data32, intval);
+	_Static_assert(sizeof(data32) == sizeof(data32.uintval),
+	    "bad modspecific32_t size");
 	CP(mod->data, data32, uintval);
-	CP(mod->data, data32, longval);
-	CP(mod->data, data32, ulongval);
 	MOD_SUNLOCK;
 	stat32 = uap->stat;