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Date: Tue, 2 Aug 2022 07:08:14 +0900
From: Namjae Jeon <linkinjeon@...nel.org>
To: Dan Carpenter <dan.carpenter@...cle.com>
Cc: kbuild@...ts.01.org, lkp@...el.com, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org, Hyunchul Lee <hyc.lee@...il.com>
Subject: Re: [samba-ksmbd:ksmbd-for-next-next 12/12] fs/ksmbd/smbacl.c:1213
smb_check_perm_dacl() warn: variable dereferenced before check 'pntsd' (see
line 1212)
2022-08-01 21:10 GMT+09:00, Dan Carpenter <dan.carpenter@...cle.com>:
> tree: git://git.samba.org/ksmbd.git ksmbd-for-next-next
> head: d0b73d20ca9100c7b969b65d8a1ff49cdd1fa9c9
> commit: d0b73d20ca9100c7b969b65d8a1ff49cdd1fa9c9 [12/12] ksmbd: fix
> heap-based overflow in set_ntacl_dacl()
> config: arc-randconfig-m041-20220731
> (https://download.01.org/0day-ci/archive/20220801/202208010716.Io52CJih-lkp@intel.com/config)
> compiler: arceb-elf-gcc (GCC) 12.1.0
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Hi Dan,
I will fix it.
Thanks for your report!
>
> New smatch warnings:
> fs/ksmbd/smbacl.c:1213 smb_check_perm_dacl() warn: variable dereferenced
> before check 'pntsd' (see line 1212)
> fs/ksmbd/smb2pdu.c:5182 smb2_get_info_sec() error: uninitialized symbol
> 'secdesclen'.
>
> Old smatch warnings:
> fs/ksmbd/smb2pdu.c:549 smb2_allocate_rsp_buf() warn: Please consider using
> kvzalloc instead of kvmalloc
> fs/ksmbd/smb2pdu.c:6123 smb2_read_pipe() warn: Please consider using
> kvzalloc instead of kvmalloc
> fs/ksmbd/smb2pdu.c:6275 smb2_read() warn: Please consider using kvzalloc
> instead of kvmalloc
> fs/ksmbd/smb2pdu.c:6424 smb2_write_rdma_channel() warn: Please consider
> using kvzalloc instead of kvmalloc
>
> vim +/pntsd +1213 fs/ksmbd/smbacl.c
>
> ef24c962d0f290 fs/ksmbd/smbacl.c Hyunchul Lee 2021-06-30 1188 int
> smb_check_perm_dacl(struct ksmbd_conn *conn, struct path *path,
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1189
> __le32 *pdaccess, int uid)
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1190 {
> 465d720485eff1 fs/ksmbd/smbacl.c Hyunchul Lee 2021-07-03 1191 struct
> user_namespace *user_ns = mnt_user_ns(path->mnt);
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1192 struct
> smb_ntsd *pntsd = NULL;
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1193 struct
> smb_acl *pdacl;
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1194 struct
> posix_acl *posix_acls;
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 1195 int rc
> = 0, pntsd_size, acl_size, aces_size, pdacl_size, dacl_offset;
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1196 struct
> smb_sid sid;
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1197 int
> granted = le32_to_cpu(*pdaccess & ~FILE_MAXIMAL_ACCESS_LE);
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1198 struct
> smb_ace *ace;
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1199 int i,
> found = 0;
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1200
> unsigned int access_bits = 0;
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1201 struct
> smb_ace *others_ace = NULL;
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1202 struct
> posix_acl_entry *pa_entry;
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1203
> unsigned int sid_type = SIDOWNER;
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 1204
> unsigned short ace_size;
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1205
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1206
> ksmbd_debug(SMB, "check permission using windows acl\n");
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 1207
> pntsd_size = ksmbd_vfs_get_sd_xattr(conn, user_ns,
> af34983e831587 fs/ksmbd/smbacl.c Hyunchul Lee 2021-06-30 1208
> path->dentry, &pntsd);
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 1209 if
> (pntsd_size <= 0)
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 1210 goto
> err_out;
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 1211
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 @1212
> dacl_offset = le32_to_cpu(pntsd->dacloffset);
>
> ^^^^^^^^^^^^^^^^^
> Dereference
>
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 @1213 if
> (!pntsd || !pntsd->dacloffset ||
>
> ^^^^^
> Checked too late
>
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 1214
> (dacl_offset + sizeof(struct smb_acl) > pntsd_size))
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 1215 goto
> err_out;
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1216
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1217 pdacl
> = (struct smb_acl *)((char *)pntsd + le32_to_cpu(pntsd->dacloffset));
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 1218
> acl_size = pntsd_size - dacl_offset;
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 1219
> pdacl_size = le16_to_cpu(pdacl->size);
> 50355b0b20103a fs/cifsd/smbacl.c Namjae Jeon 2021-03-19 1220
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 1221 if
> (pdacl_size > acl_size || pdacl_size < sizeof(struct smb_acl))
> d0b73d20ca9100 fs/ksmbd/smbacl.c Namjae Jeon 2022-07-28 1222 goto
> err_out;
> 50355b0b20103a fs/cifsd/smbacl.c Namjae Jeon 2021-03-19 1223
> e2f34481b24db2 fs/cifsd/smbacl.c Namjae Jeon 2021-03-16 1224 if
> (!pdacl->num_aces) {
>
> --
> 0-DAY CI Kernel Test Service
> https://01.org/lkp
>
>
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