user/sven/linux.git/crypto/ccm.c, branch v3.2.60

crypto: ccm - Fix handling of zero plaintext when computing mac

2014-01-03T04:33:26Z

commit 5638cabf3e4883f38dfb246c30980cebf694fbda upstream. There are cases when cryptlen can be zero in crypto_ccm_auth(): -encryptiom: input scatterlist length is zero (no plaintext) -decryption: input scatterlist contains only the mac plus the condition of having different source and destination buffers (or else scatterlist length = max(plaintext_len, ciphertext_len)). These are not handled correctly, leading to crashes like: root@p4080ds:~/crypto# insmod tcrypt.ko mode=45 ------------[ cut here ]------------ kernel BUG at crypto/scatterwalk.c:37! Oops: Exception in kernel mode, sig: 5 [#1] SMP NR_CPUS=8 P4080 DS Modules linked in: tcrypt(+) crc32c xts xcbc vmac pcbc ecb gcm ghash_generic gf128mul ccm ctr seqiv CPU: 3 PID: 1082 Comm: cryptomgr_test Not tainted 3.11.0 #14 task: ee12c5b0 ti: eecd0000 task.ti: eecd0000 NIP: c0204d98 LR: f9225848 CTR: c0204d80 REGS: eecd1b70 TRAP: 0700 Not tainted (3.11.0) MSR: 00029002 CR: 22044022 XER: 20000000 GPR00: f9225c94 eecd1c20 ee12c5b0 eecd1c28 ee879400 ee879400 00000000 ee607464 GPR08: 00000001 00000001 00000000 006b0000 c0204d80 00000000 00000002 c0698e20 GPR16: ee987000 ee895000 fffffff4 ee879500 00000100 eecd1d58 00000001 00000000 GPR24: ee879400 00000020 00000000 00000000 ee5b2800 ee607430 00000004 ee607460 NIP [c0204d98] scatterwalk_start+0x18/0x30 LR [f9225848] get_data_to_compute+0x28/0x2f0 [ccm] Call Trace: [eecd1c20] [f9225974] get_data_to_compute+0x154/0x2f0 [ccm] (unreliable) [eecd1c70] [f9225c94] crypto_ccm_auth+0x184/0x1d0 [ccm] [eecd1cb0] [f9225d40] crypto_ccm_encrypt+0x60/0x2d0 [ccm] [eecd1cf0] [c020d77c] __test_aead+0x3ec/0xe20 [eecd1e20] [c020f35c] test_aead+0x6c/0xe0 [eecd1e40] [c020f420] alg_test_aead+0x50/0xd0 [eecd1e60] [c020e5e4] alg_test+0x114/0x2e0 [eecd1ee0] [c020bd1c] cryptomgr_test+0x4c/0x60 [eecd1ef0] [c0047058] kthread+0xa8/0xb0 [eecd1f40] [c000eb0c] ret_from_kernel_thread+0x5c/0x64 Instruction dump: 0f080000 81290024 552807fe 0f080000 5529003a 4bffffb4 90830000 39400000 39000001 8124000c 2f890000 7d28579e <0f090000> 81240008 91230004 4e800020 ---[ end trace 6d652dfcd1be37bd ]--- Cc: Jussi Kivilinna Signed-off-by: Horia Geanta Signed-off-by: Herbert Xu Signed-off-by: Ben Hutchings

crypto: ccm - Fix handling of null assoc data

2009-01-27T06:11:15Z

Its a valid use case to have null associated data in a ccm vector, but this case isn't being handled properly right now. The following ccm decryption/verification test vector, using the rfc4309 implementation regularly triggers a panic, as will any other vector with null assoc data: * key: ab2f8a74b71cd2b1ff802e487d82f8b9 * iv: c6fb7d800d13abd8a6b2d8 * Associated Data: [NULL] * Tag Length: 8 * input: d5e8939fc7892e2b The resulting panic looks like so: Unable to handle kernel paging request at ffff810064ddaec0 RIP: [] :ccm:get_data_to_compute+0x1a6/0x1d6 PGD 8063 PUD 0 Oops: 0002 [1] SMP last sysfs file: /module/libata/version CPU 0 Modules linked in: crypto_tester_kmod(U) seqiv krng ansi_cprng chainiv rng ctr aes_generic aes_x86_64 ccm cryptomgr testmgr_cipher testmgr aead crypto_blkcipher crypto_a lgapi des ipv6 xfrm_nalgo crypto_api autofs4 hidp l2cap bluetooth nfs lockd fscache nfs_acl sunrpc ip_conntrack_netbios_ns ipt_REJECT xt_state ip_conntrack nfnetlink xt_ tcpudp iptable_filter ip_tables x_tables dm_mirror dm_log dm_multipath scsi_dh dm_mod video hwmon backlight sbs i2c_ec button battery asus_acpi acpi_memhotplug ac lp sg snd_intel8x0 snd_ac97_codec ac97_bus snd_seq_dummy snd_seq_oss joydev snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss ide_cd snd_pcm floppy parport_p c shpchp e752x_edac snd_timer e1000 i2c_i801 edac_mc snd soundcore snd_page_alloc i2c_core cdrom parport serio_raw pcspkr ata_piix libata sd_mod scsi_mod ext3 jbd uhci_h cd ohci_hcd ehci_hcd Pid: 12844, comm: crypto-tester Tainted: G 2.6.18-128.el5.fips1 #1 RIP: 0010:[] [] :ccm:get_data_to_compute+0x1a6/0x1d6 RSP: 0018:ffff8100134434e8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8100104898b0 RCX: ffffffffab6aea10 RDX: 0000000000000010 RSI: ffff8100104898c0 RDI: ffff810064ddaec0 RBP: 0000000000000000 R08: ffff8100104898b0 R09: 0000000000000000 R10: ffff8100103bac84 R11: ffff8100104898b0 R12: ffff810010489858 R13: ffff8100104898b0 R14: ffff8100103bac00 R15: 0000000000000000 FS: 00002ab881adfd30(0000) GS:ffffffff803ac000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff810064ddaec0 CR3: 0000000012a88000 CR4: 00000000000006e0 Process crypto-tester (pid: 12844, threadinfo ffff810013442000, task ffff81003d165860) Stack: ffff8100103bac00 ffff8100104898e8 ffff8100134436f8 ffffffff00000000 0000000000000000 ffff8100104898b0 0000000000000000 ffff810010489858 0000000000000000 ffff8100103bac00 ffff8100134436f8 ffffffff8864c634 Call Trace: [] :ccm:crypto_ccm_auth+0x12d/0x140 [] :ccm:crypto_ccm_decrypt+0x161/0x23a [] :crypto_tester_kmod:cavs_test_rfc4309_ccm+0x4a5/0x559 [...] The above is from a RHEL5-based kernel, but upstream is susceptible too. The fix is trivial: in crypto/ccm.c:crypto_ccm_auth(), pctx->ilen contains whatever was in memory when pctx was allocated if assoclen is 0. The tested fix is to simply add an else clause setting pctx->ilen to 0 for the assoclen == 0 case, so that get_data_to_compute() doesn't try doing things its not supposed to. Signed-off-by: Jarod Wilson Acked-by: Neil Horman Signed-off-by: Herbert Xu

[CRYPTO] ccm: Added CCM mode

2008-01-10T21:16:53Z

This patch adds Counter with CBC-MAC (CCM) support. RFC 3610 and NIST Special Publication 800-38C were referenced. Signed-off-by: Joy Latten Signed-off-by: Herbert Xu