git: 99d5ee8738a3 - stable/14 - ktrace: Fix uninitialized memory disclosure

The branch stable/14 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=99d5ee8738a354e0d8f12453a82ed87e47bd62f1

commit 99d5ee8738a354e0d8f12453a82ed87e47bd62f1
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2025-01-20 13:50:04 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2025-01-20 22:08:45 +0000

    ktrace: Fix uninitialized memory disclosure
    
    The sockaddr passed to ktrcapfail() may be smaller than
    sizeof(struct sockaddr), and the trailing bytes in the sockaddr
    structure will be uninitialized, whereupon they get copied out to
    userspace.
    
    PR:             283673
    Reviewed by:    jfree, emaste
    Reported by:    Yichen Chai <yichen.chai@gmail.com>
    Reported by:    Zhuo Ying Jiang Li <zyj20@cl.cam.ac.uk>
    Fixes:          9bec84131215 ("ktrace: Record detailed ECAPMODE violations")
    MFC after:      3 days
    Differential Revision:  https://reviews.freebsd.org/D48499
    
    (cherry picked from commit 5b86888bae651e54ccc0adde0ed897ec1c1e0d45)
---
 sys/kern/kern_ktrace.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/sys/kern/kern_ktrace.c b/sys/kern/kern_ktrace.c
index 1c6a2ae01f3d..2b311f2d36dc 100644
--- a/sys/kern/kern_ktrace.c
+++ b/sys/kern/kern_ktrace.c
@@ -958,9 +958,16 @@ ktrcapfail(enum ktr_cap_violation type, const void *data)
 		case CAPFAIL_PROTO:
 			kcd->cap_int = *(const int *)data;
 			break;
-		case CAPFAIL_SOCKADDR:
-			kcd->cap_sockaddr = *(const struct sockaddr *)data;
+		case CAPFAIL_SOCKADDR: {
+			size_t len;
+
+			len = MIN(((const struct sockaddr *)data)->sa_len,
+			    sizeof(kcd->cap_sockaddr));
+			memset(&kcd->cap_sockaddr, 0,
+			    sizeof(kcd->cap_sockaddr));
+			memcpy(&kcd->cap_sockaddr, data, len);
 			break;
+		}
 		case CAPFAIL_NAMEI:
 			strlcpy(kcd->cap_path, data, MAXPATHLEN);
 			break;