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63e41ebc66
We miss to take the crypto_alg_sem semaphore when traversing the crypto_alg_list for CRYPTO_MSG_GETALG dumps. This allows a race with crypto_unregister_alg() removing algorithms from the list while we're still traversing it, thereby leading to a use-after-free as show below: [ 3482.071639] general protection fault: 0000 [#1] SMP [ 3482.075639] Modules linked in: aes_x86_64 glue_helper lrw ablk_helper cryptd gf128mul ipv6 pcspkr serio_raw virtio_net microcode virtio_pci virtio_ring virtio sr_mod cdrom [last unloaded: aesni_intel] [ 3482.075639] CPU: 1 PID: 11065 Comm: crconf Not tainted 4.3.4-grsec+ #126 [ 3482.075639] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014 [ 3482.075639] task: ffff88001cd41a40 ti: ffff88001cd422c8 task.ti: ffff88001cd422c8 [ 3482.075639] RIP: 0010:[<ffffffff93722bd3>] [<ffffffff93722bd3>] strncpy+0x13/0x30 [ 3482.075639] RSP: 0018:ffff88001f713b60 EFLAGS: 00010202 [ 3482.075639] RAX: ffff88001f6c4430 RBX: ffff88001f6c43a0 RCX: ffff88001f6c4430 [ 3482.075639] RDX: 0000000000000040 RSI: fefefefefefeff16 RDI: ffff88001f6c4430 [ 3482.075639] RBP: ffff88001f713b60 R08: ffff88001f6c4470 R09: ffff88001f6c4480 [ 3482.075639] R10: 0000000000000002 R11: 0000000000000246 R12: ffff88001ce2aa28 [ 3482.075639] R13: ffff880000093700 R14: ffff88001f5e4bf8 R15: 0000000000003b20 [ 3482.075639] FS: 0000033826fa2700(0000) GS:ffff88001e900000(0000) knlGS:0000000000000000 [ 3482.075639] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3482.075639] CR2: ffffffffff600400 CR3: 00000000139ec000 CR4: 00000000001606f0 [ 3482.075639] Stack: [ 3482.075639] ffff88001f713bd8 ffffffff936ccd00 ffff88001e5c4200 ffff880000093700 [ 3482.075639] ffff88001f713bd0 ffffffff938ef4bf 0000000000000000 0000000000003b20 [ 3482.075639] ffff88001f5e4bf8 ffff88001f5e4848 0000000000000000 0000000000003b20 [ 3482.075639] Call Trace: [ 3482.075639] [<ffffffff936ccd00>] crypto_report_alg+0xc0/0x3e0 [ 3482.075639] [<ffffffff938ef4bf>] ? __alloc_skb+0x16f/0x300 [ 3482.075639] [<ffffffff936cd08a>] crypto_dump_report+0x6a/0x90 [ 3482.075639] [<ffffffff93935707>] netlink_dump+0x147/0x2e0 [ 3482.075639] [<ffffffff93935f99>] __netlink_dump_start+0x159/0x190 [ 3482.075639] [<ffffffff936ccb13>] crypto_user_rcv_msg+0xc3/0x130 [ 3482.075639] [<ffffffff936cd020>] ? crypto_report_alg+0x3e0/0x3e0 [ 3482.075639] [<ffffffff936cc4b0>] ? alg_test_crc32c+0x120/0x120 [ 3482.075639] [<ffffffff93933145>] ? __netlink_lookup+0xd5/0x120 [ 3482.075639] [<ffffffff936cca50>] ? crypto_add_alg+0x1d0/0x1d0 [ 3482.075639] [<ffffffff93938141>] netlink_rcv_skb+0xe1/0x130 [ 3482.075639] [<ffffffff936cc4f8>] crypto_netlink_rcv+0x28/0x40 [ 3482.075639] [<ffffffff939375a8>] netlink_unicast+0x108/0x180 [ 3482.075639] [<ffffffff93937c21>] netlink_sendmsg+0x541/0x770 [ 3482.075639] [<ffffffff938e31e1>] sock_sendmsg+0x21/0x40 [ 3482.075639] [<ffffffff938e4763>] SyS_sendto+0xf3/0x130 [ 3482.075639] [<ffffffff93444203>] ? bad_area_nosemaphore+0x13/0x20 [ 3482.075639] [<ffffffff93444470>] ? __do_page_fault+0x80/0x3a0 [ 3482.075639] [<ffffffff939d80cb>] entry_SYSCALL_64_fastpath+0x12/0x6e [ 3482.075639] Code: 88 4a ff 75 ed 5d 48 0f ba 2c 24 3f c3 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 85 d2 48 89 f8 48 89 f9 4c 8d 04 17 48 89 e5 74 15 <0f> b6 16 80 fa 01 88 11 48 83 de ff 48 83 c1 01 4c 39 c1 75 eb [ 3482.075639] RIP [<ffffffff93722bd3>] strncpy+0x13/0x30 To trigger the race run the following loops simultaneously for a while: $ while : ; do modprobe aesni-intel; rmmod aesni-intel; done $ while : ; do crconf show all > /dev/null; done Fix the race by taking the crypto_alg_sem read lock, thereby preventing crypto_unregister_alg() from modifying the algorithm list during the dump. This bug has been detected by the PaX memory sanitize feature. Cc: stable@vger.kernel.org Signed-off-by: Mathias Krause <minipli@googlemail.com> Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: PaX Team <pageexec@freemail.hu> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
561 lines
13 KiB
C
561 lines
13 KiB
C
/*
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* Crypto user configuration API.
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*
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* Copyright (C) 2011 secunet Security Networks AG
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* Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/module.h>
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#include <linux/crypto.h>
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#include <linux/cryptouser.h>
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#include <linux/sched.h>
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#include <net/netlink.h>
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#include <linux/security.h>
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#include <net/net_namespace.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/internal/rng.h>
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#include <crypto/akcipher.h>
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#include "internal.h"
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#define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x))
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static DEFINE_MUTEX(crypto_cfg_mutex);
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/* The crypto netlink socket */
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static struct sock *crypto_nlsk;
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struct crypto_dump_info {
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struct sk_buff *in_skb;
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struct sk_buff *out_skb;
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u32 nlmsg_seq;
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u16 nlmsg_flags;
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};
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static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact)
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{
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struct crypto_alg *q, *alg = NULL;
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down_read(&crypto_alg_sem);
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list_for_each_entry(q, &crypto_alg_list, cra_list) {
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int match = 0;
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if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
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continue;
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if (strlen(p->cru_driver_name))
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match = !strcmp(q->cra_driver_name,
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p->cru_driver_name);
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else if (!exact)
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match = !strcmp(q->cra_name, p->cru_name);
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if (!match)
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continue;
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if (unlikely(!crypto_mod_get(q)))
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continue;
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alg = q;
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break;
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}
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up_read(&crypto_alg_sem);
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return alg;
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}
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static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct crypto_report_cipher rcipher;
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strncpy(rcipher.type, "cipher", sizeof(rcipher.type));
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rcipher.blocksize = alg->cra_blocksize;
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rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
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rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
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if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
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sizeof(struct crypto_report_cipher), &rcipher))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct crypto_report_comp rcomp;
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strncpy(rcomp.type, "compression", sizeof(rcomp.type));
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if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
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sizeof(struct crypto_report_comp), &rcomp))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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static int crypto_report_akcipher(struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct crypto_report_akcipher rakcipher;
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strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
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if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
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sizeof(struct crypto_report_akcipher), &rakcipher))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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static int crypto_report_one(struct crypto_alg *alg,
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struct crypto_user_alg *ualg, struct sk_buff *skb)
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{
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strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
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strncpy(ualg->cru_driver_name, alg->cra_driver_name,
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sizeof(ualg->cru_driver_name));
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strncpy(ualg->cru_module_name, module_name(alg->cra_module),
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sizeof(ualg->cru_module_name));
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ualg->cru_type = 0;
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ualg->cru_mask = 0;
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ualg->cru_flags = alg->cra_flags;
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ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
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if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
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goto nla_put_failure;
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if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
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struct crypto_report_larval rl;
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strncpy(rl.type, "larval", sizeof(rl.type));
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if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
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sizeof(struct crypto_report_larval), &rl))
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goto nla_put_failure;
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goto out;
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}
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if (alg->cra_type && alg->cra_type->report) {
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if (alg->cra_type->report(skb, alg))
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goto nla_put_failure;
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goto out;
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}
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switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
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case CRYPTO_ALG_TYPE_CIPHER:
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if (crypto_report_cipher(skb, alg))
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goto nla_put_failure;
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break;
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case CRYPTO_ALG_TYPE_COMPRESS:
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if (crypto_report_comp(skb, alg))
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goto nla_put_failure;
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break;
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case CRYPTO_ALG_TYPE_AKCIPHER:
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if (crypto_report_akcipher(skb, alg))
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goto nla_put_failure;
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break;
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}
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out:
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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static int crypto_report_alg(struct crypto_alg *alg,
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struct crypto_dump_info *info)
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{
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struct sk_buff *in_skb = info->in_skb;
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struct sk_buff *skb = info->out_skb;
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struct nlmsghdr *nlh;
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struct crypto_user_alg *ualg;
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int err = 0;
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nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
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CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
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if (!nlh) {
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err = -EMSGSIZE;
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goto out;
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}
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ualg = nlmsg_data(nlh);
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err = crypto_report_one(alg, ualg, skb);
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if (err) {
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nlmsg_cancel(skb, nlh);
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goto out;
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}
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nlmsg_end(skb, nlh);
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out:
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return err;
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}
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static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
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struct nlattr **attrs)
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{
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struct crypto_user_alg *p = nlmsg_data(in_nlh);
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struct crypto_alg *alg;
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struct sk_buff *skb;
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struct crypto_dump_info info;
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int err;
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if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
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return -EINVAL;
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alg = crypto_alg_match(p, 0);
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if (!alg)
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return -ENOENT;
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err = -ENOMEM;
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skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
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if (!skb)
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goto drop_alg;
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info.in_skb = in_skb;
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info.out_skb = skb;
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info.nlmsg_seq = in_nlh->nlmsg_seq;
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info.nlmsg_flags = 0;
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err = crypto_report_alg(alg, &info);
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drop_alg:
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crypto_mod_put(alg);
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if (err)
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return err;
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return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
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}
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static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct crypto_alg *alg;
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struct crypto_dump_info info;
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int err;
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if (cb->args[0])
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goto out;
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cb->args[0] = 1;
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info.in_skb = cb->skb;
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info.out_skb = skb;
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info.nlmsg_seq = cb->nlh->nlmsg_seq;
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info.nlmsg_flags = NLM_F_MULTI;
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list_for_each_entry(alg, &crypto_alg_list, cra_list) {
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err = crypto_report_alg(alg, &info);
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if (err)
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goto out_err;
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}
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out:
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return skb->len;
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out_err:
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return err;
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}
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static int crypto_dump_report_done(struct netlink_callback *cb)
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{
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return 0;
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}
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static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct nlattr **attrs)
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{
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struct crypto_alg *alg;
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struct crypto_user_alg *p = nlmsg_data(nlh);
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struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
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LIST_HEAD(list);
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if (!netlink_capable(skb, CAP_NET_ADMIN))
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return -EPERM;
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if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
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return -EINVAL;
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if (priority && !strlen(p->cru_driver_name))
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return -EINVAL;
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alg = crypto_alg_match(p, 1);
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if (!alg)
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return -ENOENT;
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down_write(&crypto_alg_sem);
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crypto_remove_spawns(alg, &list, NULL);
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if (priority)
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alg->cra_priority = nla_get_u32(priority);
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up_write(&crypto_alg_sem);
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crypto_mod_put(alg);
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crypto_remove_final(&list);
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return 0;
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}
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static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct nlattr **attrs)
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{
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struct crypto_alg *alg;
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struct crypto_user_alg *p = nlmsg_data(nlh);
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int err;
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if (!netlink_capable(skb, CAP_NET_ADMIN))
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return -EPERM;
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if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
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return -EINVAL;
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alg = crypto_alg_match(p, 1);
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if (!alg)
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return -ENOENT;
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/* We can not unregister core algorithms such as aes-generic.
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* We would loose the reference in the crypto_alg_list to this algorithm
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* if we try to unregister. Unregistering such an algorithm without
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* removing the module is not possible, so we restrict to crypto
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* instances that are build from templates. */
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err = -EINVAL;
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if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
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goto drop_alg;
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err = -EBUSY;
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if (atomic_read(&alg->cra_refcnt) > 2)
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goto drop_alg;
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err = crypto_unregister_instance((struct crypto_instance *)alg);
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drop_alg:
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crypto_mod_put(alg);
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return err;
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}
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static struct crypto_alg *crypto_user_skcipher_alg(const char *name, u32 type,
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u32 mask)
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{
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int err;
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struct crypto_alg *alg;
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type = crypto_skcipher_type(type);
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mask = crypto_skcipher_mask(mask);
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for (;;) {
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alg = crypto_lookup_skcipher(name, type, mask);
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if (!IS_ERR(alg))
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return alg;
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err = PTR_ERR(alg);
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if (err != -EAGAIN)
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break;
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if (fatal_signal_pending(current)) {
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err = -EINTR;
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break;
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}
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}
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return ERR_PTR(err);
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}
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static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct nlattr **attrs)
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{
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int exact = 0;
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const char *name;
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struct crypto_alg *alg;
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struct crypto_user_alg *p = nlmsg_data(nlh);
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struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
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if (!netlink_capable(skb, CAP_NET_ADMIN))
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return -EPERM;
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if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
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return -EINVAL;
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if (strlen(p->cru_driver_name))
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exact = 1;
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if (priority && !exact)
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return -EINVAL;
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alg = crypto_alg_match(p, exact);
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if (alg) {
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crypto_mod_put(alg);
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return -EEXIST;
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}
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if (strlen(p->cru_driver_name))
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name = p->cru_driver_name;
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else
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name = p->cru_name;
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switch (p->cru_type & p->cru_mask & CRYPTO_ALG_TYPE_MASK) {
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case CRYPTO_ALG_TYPE_GIVCIPHER:
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case CRYPTO_ALG_TYPE_BLKCIPHER:
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case CRYPTO_ALG_TYPE_ABLKCIPHER:
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alg = crypto_user_skcipher_alg(name, p->cru_type, p->cru_mask);
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break;
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default:
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alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
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}
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|
|
|
if (IS_ERR(alg))
|
|
return PTR_ERR(alg);
|
|
|
|
down_write(&crypto_alg_sem);
|
|
|
|
if (priority)
|
|
alg->cra_priority = nla_get_u32(priority);
|
|
|
|
up_write(&crypto_alg_sem);
|
|
|
|
crypto_mod_put(alg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_del_rng(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct nlattr **attrs)
|
|
{
|
|
if (!netlink_capable(skb, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
return crypto_del_default_rng();
|
|
}
|
|
|
|
#define MSGSIZE(type) sizeof(struct type)
|
|
|
|
static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
|
|
[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
|
|
[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
|
|
[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
|
|
[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0,
|
|
};
|
|
|
|
static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
|
|
[CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32},
|
|
};
|
|
|
|
#undef MSGSIZE
|
|
|
|
static const struct crypto_link {
|
|
int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
|
|
int (*dump)(struct sk_buff *, struct netlink_callback *);
|
|
int (*done)(struct netlink_callback *);
|
|
} crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
|
|
[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
|
|
[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
|
|
[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
|
|
[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
|
|
.dump = crypto_dump_report,
|
|
.done = crypto_dump_report_done},
|
|
[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
|
|
};
|
|
|
|
static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct nlattr *attrs[CRYPTOCFGA_MAX+1];
|
|
const struct crypto_link *link;
|
|
int type, err;
|
|
|
|
type = nlh->nlmsg_type;
|
|
if (type > CRYPTO_MSG_MAX)
|
|
return -EINVAL;
|
|
|
|
type -= CRYPTO_MSG_BASE;
|
|
link = &crypto_dispatch[type];
|
|
|
|
if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
|
|
(nlh->nlmsg_flags & NLM_F_DUMP))) {
|
|
struct crypto_alg *alg;
|
|
u16 dump_alloc = 0;
|
|
|
|
if (link->dump == NULL)
|
|
return -EINVAL;
|
|
|
|
down_read(&crypto_alg_sem);
|
|
list_for_each_entry(alg, &crypto_alg_list, cra_list)
|
|
dump_alloc += CRYPTO_REPORT_MAXSIZE;
|
|
|
|
{
|
|
struct netlink_dump_control c = {
|
|
.dump = link->dump,
|
|
.done = link->done,
|
|
.min_dump_alloc = dump_alloc,
|
|
};
|
|
err = netlink_dump_start(crypto_nlsk, skb, nlh, &c);
|
|
}
|
|
up_read(&crypto_alg_sem);
|
|
|
|
return err;
|
|
}
|
|
|
|
err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
|
|
crypto_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (link->doit == NULL)
|
|
return -EINVAL;
|
|
|
|
return link->doit(skb, nlh, attrs);
|
|
}
|
|
|
|
static void crypto_netlink_rcv(struct sk_buff *skb)
|
|
{
|
|
mutex_lock(&crypto_cfg_mutex);
|
|
netlink_rcv_skb(skb, &crypto_user_rcv_msg);
|
|
mutex_unlock(&crypto_cfg_mutex);
|
|
}
|
|
|
|
static int __init crypto_user_init(void)
|
|
{
|
|
struct netlink_kernel_cfg cfg = {
|
|
.input = crypto_netlink_rcv,
|
|
};
|
|
|
|
crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
|
|
if (!crypto_nlsk)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit crypto_user_exit(void)
|
|
{
|
|
netlink_kernel_release(crypto_nlsk);
|
|
}
|
|
|
|
module_init(crypto_user_init);
|
|
module_exit(crypto_user_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
|
|
MODULE_DESCRIPTION("Crypto userspace configuration API");
|
|
MODULE_ALIAS("net-pf-16-proto-21");
|