4.3.2-stable review

This is the start of the stable review cycle for the 4.3.2 release. There are 2 patches in this series, all will be posted as a response to this one. If anyone has any issues with these being applied, please let me know.

Responses should be made by Fri Dec 11 18:02:18 UTC 2015. Anything received after that time might be too late.

The whole patch series can be found in one patch at:

	kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.3.2-rc1.gz

and the diffstat can be found below.

thanks,

greg k-h

-------------
Pseudo-Shortlog of commits:

Greg Kroah-Hartman <[email protected]>

    Linux 4.3.2-rc1

David Howells <[email protected]>
X.509: Fix the time validation [ver #2]

sudip <[email protected]>
crypto: asymmetric_keys - remove always false comparison

-------------

Diffstat:

 Makefile                                  |  4 ++--
 crypto/asymmetric_keys/x509_cert_parser.c | 18 ++++++++++--------
 2 files changed, 12 insertions(+), 10 deletions(-)

4.3-stable review patch. If anyone has any objections, please let me know.

------------------

From: sudip <[email protected]>

commit 4dd17c9c8a30c8d8cd1c9d4b94f08aca4b038d3e upstream.

hour, min and sec are unsigned int and they can never be less than zero.

---
 crypto/asymmetric_keys/x509_cert_parser.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

@@ -546,9 +546,9 @@ int x509_decode_time(time64_t *_t,  size
 	if (year < 1970 ||
 	    mon < 1 || mon > 12 ||
 	    day < 1 || day > mon_len ||
-	    hour < 0 || hour > 23 ||
-	    min < 0 || min > 59 ||
-	    sec < 0 || sec > 59)
+	    hour > 23 ||
+	    min > 59 ||
+	    sec > 59)
 		goto invalid_time;
 	
 	*_t = mktime64(year, mon, day, hour, min, sec);

4.3-stable review patch. If anyone has any objections, please let me know.

------------------

From: David Howells <[email protected]>

commit cc25b994acfbc901429da682d0f73c190e960206 upstream.

This fixes CVE-2015-5327. It affects kernels from 4.3-rc1 onwards.

Fix the X.509 time validation to use month number-1 when looking up the number of days in that month. Also put the month number validation before doing the lookup so as not to risk overrunning the array.

This can be tested by doing the following:

cat <<EOF | openssl x509 -outform DER | keyctl padd asymmetric "" @s -----BEGIN CERTIFICATE----- MIIDbjCCAlagAwIBAgIJAN/lUld+VR4hMA0GCSqGSIb3DQEBCwUAMCkxETAPBgNV BAoMCGxvY2FsLWNhMRQwEgYDVQQDDAtzaWduaW5nIGtleTAeFw0xNTA5MDEyMTMw MThaFw0xNjA4MzEyMTMwMThaMCkxETAPBgNVBAoMCGxvY2FsLWNhMRQwEgYDVQQD DAtzaWduaW5nIGtleTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBANrn crcMfMeG67nagX4+m02Xk9rkmsMKI5XTUxbikROe7GSUVJ27sPVPZp4mgzoWlvhh jfK8CC/qhEhwep8Pgg4EJZyWOjhZb7R97ckGvLIoUC6IO3FC2ZnR7WtmWDgo2Jcj VlXwJdHhKU1VZwulh81O61N8IBKqz2r/kDhIWiicUCUkI/Do/RMRfKAoDBcSh86m gOeIAGfq62vbiZhVsX5dOE8Oo2TK5weAvwUIOR7OuGBl5AqwFlPnXQolewiHzKry THg9e44HfzG4Mi6wUvcJxVaQT1h5SrKD779Z5+8+wf1JLaooetcEUArvWyuxCU59 qxA4lsTjBwl4cmEki+cCAwEAAaOBmDCBlTAMBgNVHRMEBTADAQH/MAsGA1UdDwQE AwIHgDAdBgNVHQ4EFgQUyND/eKUis7ep/hXMJ8iZMdUhI+IwWQYDVR0jBFIwUIAU yND/eKUis7ep/hXMJ8iZMdUhI+KhLaQrMCkxETAPBgNVBAoMCGxvY2FsLWNhMRQw EgYDVQQDDAtzaWduaW5nIGtleYIJAN/lUld+VR4hMA0GCSqGSIb3DQEBCwUAA4IB AQAMqm1N1yD5pimUELLhT5eO2lRdGUfTozljRxc7e2QT3RLk2TtGhg65JFFN6eml XS58AEPVcAsSLDlR6WpOpOLB2giM0+fV/eYFHHmh22yqTJl4YgkdUwyzPdCHNOZL hmSKeY9xliHb6PNrNWWtZwhYYvRaO2DX4GXOMR0Oa2O4vaYu6/qGlZOZv3U6qZLY wwHEJSrqeBDyMuwN+eANHpoSpiBzD77S4e+7hUDJnql4j6xzJ65+nWJ89fCrQypR 4sN5R3aGeIh3QAQUIKpHilwek0CtEaYERgc5m+jGyKSc1rezJW62hWRTaitOc+d5 G5hh+9YpnYcxQHEKnZ7rFNKJ
-----END CERTIFICATE-----
EOF

If it works, it emit a key ID; if it fails, it should give a bad message error.

---
 crypto/asymmetric_keys/x509_cert_parser.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

@@ -531,7 +531,11 @@ int x509_decode_time(time64_t *_t,  size
 	if (*p != 'Z')
 		goto unsupported_time;
 
-	mon_len = month_lengths[mon];
+	if (year < 1970 ||
+	    mon < 1 || mon > 12)
+		goto invalid_time;
+
+	mon_len = month_lengths[mon - 1];
 	if (mon == 2) {
 		if (year % 4 == 0) {
 			mon_len = 29;

@@ -543,14 +547,12 @@ int x509_decode_time(time64_t *_t,  size
 		}
 	}
 
-	if (year < 1970 ||
-	    mon < 1 || mon > 12 ||
-	    day < 1 || day > mon_len ||
+	if (day < 1 || day > mon_len ||
 	    hour > 23 ||
 	    min > 59 ||
 	    sec > 59)
 		goto invalid_time;
-	
+
 	*_t = mktime64(year, mon, day, hour, min, sec);
 	return 0;
 

Am 10.12.2015 um 19:03 schrieb Greg Kroah-Hartman:

Tested successfully by running a kernel with those two patches. Thanks a lot for the quick reaction.

Regards,

Alexander Holler

Great, thanks for testing and leting me know.

greg k-h

Compiled and booted on my test system. No dmesg regressions,

thanks,
-- Shuah

Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
[email protected] | (970) 217-8978

Great, thanks for testing.

greg k-h

Build results:

	total: 145 pass: 145 fail: 0
Qemu test results:
	total: 95 pass: 95 fail: 0

Details are available at http://server.roeck-us.net:8010/builders.

Guenter

Thanks for testing and letting me know.

I think I'll release this one sooner than expected due to the bug it fixes...

thanks,

greg k-h