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charset="utf-8" Content-ID: <8D9C82CD24EAA04CBC02AF7A64E0E8F2@namprd15.prod.outlook.com> Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [PATCH] hfsplus: fix uninit-value in hfsplus_strcasecmp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.20,FMLib:17.12.100.49 definitions=2026-01-20_06,2026-01-20_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 priorityscore=1501 bulkscore=0 lowpriorityscore=0 phishscore=0 malwarescore=0 impostorscore=0 clxscore=1011 adultscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=2 engine=8.19.0-2601150000 definitions=main-2601200185 On Tue, 2026-01-20 at 10:41 +0530, Deepanshu Kartikey wrote: > Syzbot reported a KMSAN uninit-value issue in hfsplus_strcasecmp() during > filesystem mount operations. The root cause is that hfsplus_find_cat() > declares a local hfsplus_cat_entry variable without initialization before > passing it to hfs_brec_read(). >=20 > If hfs_brec_read() doesn't completely fill the entire structure (e.g., wh= en > the on-disk data is shorter than sizeof(hfsplus_cat_entry)), the padding > bytes in tmp.thread.nodeName remain uninitialized. These uninitialized > bytes are then copied by hfsplus_cat_build_key_uni() into the search key, > and subsequently accessed by hfsplus_strcasecmp() during catalog lookups, > triggering the KMSAN warning. Frankly speaking, I don't quite follow what is wrong with current logic from your explanation. Only, struct hfsplus_cat_thread contains nodeName string.= And hfsplus_strcasecmp() can try to compare some strings only for Catalog thread type. But hfs_brec_read() should read namely only this type of Catalog File record. So, I cannot imagine how likewise issue could happen. Could you exp= lain the issue more clearly? How uninitiliazed nodeName strings can be used for comparison? How does it happened? Because, struct hfsplus_cat_thread is the biggest item in hfsplus_cat_entry union. The struct hfsplus_cat_file and st= ruct hfsplus_cat_folder don't contain any strings and strings cannot be used for comparison in these structures case. But struct hfsplus_cat_thread should be read completely with the string. >=20 > Fix this by zeroing the tmp variable before use to ensure all padding > bytes are initialized. >=20 > Reported-by: syzbot+d80abb5b890d39261e72@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=3Dd80abb5b890d39261e72 =20 > Tested-by: syzbot+d80abb5b890d39261e72@syzkaller.appspotmail.com > Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") > Signed-off-by: Deepanshu Kartikey > --- > fs/hfsplus/catalog.c | 1 + > 1 file changed, 1 insertion(+) >=20 > diff --git a/fs/hfsplus/catalog.c b/fs/hfsplus/catalog.c > index 02c1eee4a4b8..9c75d1736427 100644 > --- a/fs/hfsplus/catalog.c > +++ b/fs/hfsplus/catalog.c > @@ -199,6 +199,7 @@ int hfsplus_find_cat(struct super_block *sb, u32 cnid, > u16 type; > =20 > hfsplus_cat_build_key_with_cnid(sb, fd->search_key, cnid); > + memset(&tmp, 0, sizeof(tmp)); What's about of using initialization: hfsplus_cat_entry tmp =3D {0}; instead of using memset()? Thanks, Slava. > err =3D hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry)); > if (err) > return err;