Added CC: <stable@xxxxxxxxxxxxxxx> On Fri, Jul 19, 2013 at 10:46 AM, Steve French <smfrench@xxxxxxxxx> wrote: > merged into cifs-2.6.git > > On Fri, Jul 19, 2013 at 5:45 AM, Jeff Layton <jlayton@xxxxxxxxxx> wrote: >> On Fri, 19 Jul 2013 09:01:36 +0800 >> Chen Gang <gang.chen@xxxxxxxxxxx> wrote: >> >>> For cifs_set_cifscreds() in "fs/cifs/connect.c", 'desc' buffer length >>> is 'CIFSCREDS_DESC_SIZE' (56 is less than 256), and 'ses->domainName' >>> length may be "255 + '\0'". >>> >>> The related sprintf() may cause memory overflow, so need extend related >>> buffer enough to hold all things. >>> >>> It is also necessary to be sure of 'ses->domainName' must be less than >>> 256, and define the related macro instead of hard code number '256'. >>> >>> Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx> >>> --- >>> fs/cifs/cifsencrypt.c | 2 +- >>> fs/cifs/cifsglob.h | 1 + >>> fs/cifs/connect.c | 7 ++++--- >>> fs/cifs/sess.c | 6 +++--- >>> 4 files changed, 9 insertions(+), 7 deletions(-) >>> >>> diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c >>> index 45e57cc..bb84d7c 100644 >>> --- a/fs/cifs/cifsencrypt.c >>> +++ b/fs/cifs/cifsencrypt.c >>> @@ -421,7 +421,7 @@ find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) >>> if (blobptr + attrsize > blobend) >>> break; >>> if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { >>> - if (!attrsize) >>> + if (!attrsize || attrsize >= MAX_DOMAINNAME_SIZE) >>> break; >>> if (!ses->domainName) { >>> ses->domainName = >>> diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h >>> index 33f17ed..64bb4c5 100644 >>> --- a/fs/cifs/cifsglob.h >>> +++ b/fs/cifs/cifsglob.h >>> @@ -44,6 +44,7 @@ >>> #define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1) >>> #define MAX_SERVER_SIZE 15 >>> #define MAX_SHARE_SIZE 80 >>> +#define MAX_DOMAINNAME_SIZE 256 /* maximum fully qualified domain name (FQDN) */ >>> #define MAX_USERNAME_SIZE 256 /* reasonable maximum for current servers */ >>> #define MAX_PASSWORD_SIZE 512 /* max for windows seems to be 256 wide chars */ >>> >>> diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c >>> index fa68813..3f9dcf7 100644 >>> --- a/fs/cifs/connect.c >>> +++ b/fs/cifs/connect.c >>> @@ -1675,7 +1675,8 @@ cifs_parse_mount_options(const char *mountdata, const char *devname, >>> if (string == NULL) >>> goto out_nomem; >>> >>> - if (strnlen(string, 256) == 256) { >>> + if (strnlen(string, MAX_DOMAINNAME_SIZE) >>> + == MAX_DOMAINNAME_SIZE) { >>> printk(KERN_WARNING "CIFS: domain name too" >>> " long\n"); >>> goto cifs_parse_mount_err; >>> @@ -2276,8 +2277,8 @@ cifs_put_smb_ses(struct cifs_ses *ses) >>> >>> #ifdef CONFIG_KEYS >>> >>> -/* strlen("cifs:a:") + INET6_ADDRSTRLEN + 1 */ >>> -#define CIFSCREDS_DESC_SIZE (7 + INET6_ADDRSTRLEN + 1) >>> +/* strlen("cifs:a:") + MAX_DOMAINNAME_SIZE + 1 */ >>> +#define CIFSCREDS_DESC_SIZE (7 + MAX_DOMAINNAME_SIZE + 1) >>> >>> /* Populate username and pw fields from keyring if possible */ >>> static int >>> diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c >>> index 79358e3..57b1537 100644 >>> --- a/fs/cifs/sess.c >>> +++ b/fs/cifs/sess.c >>> @@ -197,7 +197,7 @@ static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses, >>> bytes_ret = 0; >>> } else >>> bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName, >>> - 256, nls_cp); >>> + MAX_DOMAINNAME_SIZE, nls_cp); >>> bcc_ptr += 2 * bytes_ret; >>> bcc_ptr += 2; /* account for null terminator */ >>> >>> @@ -255,8 +255,8 @@ static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, >>> >>> /* copy domain */ >>> if (ses->domainName != NULL) { >>> - strncpy(bcc_ptr, ses->domainName, 256); >>> - bcc_ptr += strnlen(ses->domainName, 256); >>> + strncpy(bcc_ptr, ses->domainName, MAX_DOMAINNAME_SIZE); >>> + bcc_ptr += strnlen(ses->domainName, MAX_DOMAINNAME_SIZE); >>> } /* else we will send a null domain name >>> so the server will default to its own domain */ >>> *bcc_ptr = 0; >> >> Looks good... >> >> Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx> > > > > -- > Thanks, > > Steve -- Thanks, Steve -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html