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SubjectRe: 2.6.19-git13: uts banner changes break SLES9 (at least)
On Mon, Dec 11, Andy Whitcroft wrote:

> I am afraid to report that this second version also fails for me, as you
> point out CIFS can break us if defined. In fact we used to get away
> with this on my test system due to ordering magic luck, I presume the
> move to __initdata has triggered this. Much as I agree that this is
> wrong we are still going to break people with this.

I'm looking at cifs_strtoUCS and wonder if its safe to check 'len &&
*from'. IF it really is, the functions could snprintf to the stack and
pass this to cifs_strtoUCS.

Quick, compile tested, patch below.


Index: linux-2.6/fs/cifs/connect.c
===================================================================
--- linux-2.6.orig/fs/cifs/connect.c
+++ linux-2.6/fs/cifs/connect.c
@@ -2070,6 +2070,7 @@ CIFSSessSetup(unsigned int xid, struct c
char session_key[CIFS_SESS_KEY_SIZE],
const struct nls_table *nls_codepage)
{
+ char banner[2*32+1];
struct smb_hdr *smb_buffer;
struct smb_hdr *smb_buffer_response;
SESSION_SETUP_ANDX *pSMB;
@@ -2135,6 +2136,8 @@ CIFSSessSetup(unsigned int xid, struct c
memcpy(bcc_ptr, (char *) session_key, CIFS_SESS_KEY_SIZE);
bcc_ptr += CIFS_SESS_KEY_SIZE;

+ snprintf(banner, sizeof(banner), "%s version %s", utsname()->sysname,
+ utsname()->release);
if (ses->capabilities & CAP_UNICODE) {
if ((long) bcc_ptr % 2) { /* must be word aligned for Unicode */
*bcc_ptr = 0;
@@ -2160,12 +2163,8 @@ CIFSSessSetup(unsigned int xid, struct c
bcc_ptr += 2 * bytes_returned;
bcc_ptr += 2;
bytes_returned =
- cifs_strtoUCS((__le16 *) bcc_ptr, "Linux version ",
- 32, nls_codepage);
- bcc_ptr += 2 * bytes_returned;
- bytes_returned =
- cifs_strtoUCS((__le16 *) bcc_ptr, utsname()->release,
- 32, nls_codepage);
+ cifs_strtoUCS((__le16 *) bcc_ptr, banner,
+ 64, nls_codepage);
bcc_ptr += 2 * bytes_returned;
bcc_ptr += 2;
bytes_returned =
@@ -2189,10 +2188,8 @@ CIFSSessSetup(unsigned int xid, struct c
*bcc_ptr = 0;
bcc_ptr++;
}
- strcpy(bcc_ptr, "Linux version ");
- bcc_ptr += strlen("Linux version ");
- strcpy(bcc_ptr, utsname()->release);
- bcc_ptr += strlen(utsname()->release) + 1;
+ strcpy(bcc_ptr, banner);
+ bcc_ptr += strlen(banner) + 1;
strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
}
@@ -2360,6 +2357,7 @@ CIFSNTLMSSPNegotiateSessSetup(unsigned i
struct cifsSesInfo *ses, int * pNTLMv2_flag,
const struct nls_table *nls_codepage)
{
+ char banner[2*32+1];
struct smb_hdr *smb_buffer;
struct smb_hdr *smb_buffer_response;
SESSION_SETUP_ANDX *pSMB;
@@ -2445,6 +2443,8 @@ CIFSNTLMSSPNegotiateSessSetup(unsigned i
SecurityBlob->DomainName.Buffer = 0;
SecurityBlob->DomainName.Length = 0;
SecurityBlob->DomainName.MaximumLength = 0;
+ snprintf(banner, sizeof(banner), "%s version %s", utsname()->sysname,
+ utsname()->release);
if (ses->capabilities & CAP_UNICODE) {
if ((long) bcc_ptr % 2) {
*bcc_ptr = 0;
@@ -2452,11 +2452,7 @@ CIFSNTLMSSPNegotiateSessSetup(unsigned i
}

bytes_returned =
- cifs_strtoUCS((__le16 *) bcc_ptr, "Linux version ",
- 32, nls_codepage);
- bcc_ptr += 2 * bytes_returned;
- bytes_returned =
- cifs_strtoUCS((__le16 *) bcc_ptr, utsname()->release, 32,
+ cifs_strtoUCS((__le16 *) bcc_ptr, banner, 64,
nls_codepage);
bcc_ptr += 2 * bytes_returned;
bcc_ptr += 2; /* null terminate Linux version */
@@ -2471,10 +2467,8 @@ CIFSNTLMSSPNegotiateSessSetup(unsigned i
*(bcc_ptr + 2) = 0;
bcc_ptr += 2; /* null domain */
} else { /* ASCII */
- strcpy(bcc_ptr, "Linux version ");
- bcc_ptr += strlen("Linux version ");
- strcpy(bcc_ptr, utsname()->release);
- bcc_ptr += strlen(utsname()->release) + 1;
+ strcpy(bcc_ptr, banner);
+ bcc_ptr += strlen(banner) + 1;
strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
bcc_ptr++; /* empty domain field */
@@ -2694,6 +2688,7 @@ CIFSNTLMSSPAuthSessSetup(unsigned int xi
char *ntlm_session_key, int ntlmv2_flag,
const struct nls_table *nls_codepage)
{
+ char banner[2*32+1];
struct smb_hdr *smb_buffer;
struct smb_hdr *smb_buffer_response;
SESSION_SETUP_ANDX *pSMB;
@@ -2792,6 +2787,8 @@ CIFSNTLMSSPAuthSessSetup(unsigned int xi
SecurityBlobLength += CIFS_SESS_KEY_SIZE;
bcc_ptr += CIFS_SESS_KEY_SIZE;

+ snprintf(banner, sizeof(banner), "%s version %s", utsname()->sysname,
+ utsname()->release);
if (ses->capabilities & CAP_UNICODE) {
if (domain == NULL) {
SecurityBlob->DomainName.Buffer = 0;
@@ -2843,11 +2840,7 @@ CIFSNTLMSSPAuthSessSetup(unsigned int xi
bcc_ptr++;
}
bytes_returned =
- cifs_strtoUCS((__le16 *) bcc_ptr, "Linux version ",
- 32, nls_codepage);
- bcc_ptr += 2 * bytes_returned;
- bytes_returned =
- cifs_strtoUCS((__le16 *) bcc_ptr, utsname()->release, 32,
+ cifs_strtoUCS((__le16 *) bcc_ptr, banner, 64,
nls_codepage);
bcc_ptr += 2 * bytes_returned;
bcc_ptr += 2; /* null term version string */
@@ -2897,10 +2890,8 @@ CIFSNTLMSSPAuthSessSetup(unsigned int xi
}
/* BB fill in our workstation name if known BB */

- strcpy(bcc_ptr, "Linux version ");
- bcc_ptr += strlen("Linux version ");
- strcpy(bcc_ptr, utsname()->release);
- bcc_ptr += strlen(utsname()->release) + 1;
+ strcpy(bcc_ptr, banner);
+ bcc_ptr += strlen(banner) + 1;
strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
bcc_ptr++; /* null domain */
Index: linux-2.6/fs/cifs/sess.c
===================================================================
--- linux-2.6.orig/fs/cifs/sess.c
+++ linux-2.6/fs/cifs/sess.c
@@ -77,6 +77,7 @@ static __u32 cifs_ssetup_hdr(struct cifs
static void unicode_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses,
const struct nls_table * nls_cp)
{
+ char banner[2*32+1];
char * bcc_ptr = *pbcc_area;
int bytes_ret = 0;

@@ -113,12 +114,11 @@ static void unicode_ssetup_strings(char
bcc_ptr += 2; /* account for null terminator */

/* Copy OS version */
- bytes_ret = cifs_strtoUCS((__le16 *)bcc_ptr, "Linux version ", 32,
+ snprintf(banner, sizeof(banner), "%s version %s", utsname()->sysname,
+ init_utsname()->release);
+ bytes_ret = cifs_strtoUCS((__le16 *)bcc_ptr, banner, 32,
nls_cp);
bcc_ptr += 2 * bytes_ret;
- bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, init_utsname()->release,
- 32, nls_cp);
- bcc_ptr += 2 * bytes_ret;
bcc_ptr += 2; /* trailing null */

bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
@@ -132,6 +132,7 @@ static void unicode_ssetup_strings(char
static void ascii_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses,
const struct nls_table * nls_cp)
{
+ char banner[2*32+1];
char * bcc_ptr = *pbcc_area;

/* copy user */
@@ -159,10 +160,10 @@ static void ascii_ssetup_strings(char **

/* BB check for overflow here */

- strcpy(bcc_ptr, "Linux version ");
- bcc_ptr += strlen("Linux version ");
- strcpy(bcc_ptr, init_utsname()->release);
- bcc_ptr += strlen(init_utsname()->release) + 1;
+ snprintf(banner, sizeof(banner), "%s version %s", utsname()->sysname,
+ init_utsname()->release);
+ strcpy(bcc_ptr, banner);
+ bcc_ptr += strlen(banner) + 1;

strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
-
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