Re: [PATCH 2/2] MPI: Fix mpi_powm() when exponent is 0 and the result has no limbs

[David Howells <dhowells@redhat.com>]

I've integrated my patch and yours (see attached) - are you okay with the
result?

> We could even remove RESIZE_IF_NEEDED() to not confuse people, because
> currently it has no users.

Yep, but that'll have to be a separate patch.

David
---
commit cfe384ff418f11db2a3647f79635393ecb723c6f
Author: Andrey Ryabinin <aryabinin@virtuozzo.com>
Date:   Wed Nov 23 16:44:47 2016 +0000

    mpi: Fix NULL ptr dereference in mpi_powm()
    
    This fixes CVE-2016-8650.
    
    If mpi_powm() is given a zero exponent, it wants to immediately return
    either 1 or 0, depending on the modulus.  However, if the result was
    initalised with zero limb space, no limbs space is allocated and a
    NULL-pointer exception ensues.
    
    Fix this by allocating a minimal amount of limb space for the result when
    the 0-exponent case when the result is 1 and not touching the limb space
    when the result is 0.
    
    This affects the use of RSA keys and X.509 certificates that carry them.
    
    BUG: unable to handle kernel NULL pointer dereference at           (null)
    IP: [<ffffffff8138ce5d>] mpi_powm+0x32/0x7e6
    PGD 0
    Oops: 0002 [#1] SMP
    Modules linked in:
    CPU: 3 PID: 3014 Comm: keyctl Not tainted 4.9.0-rc6-fscache+ #278
    Hardware name: ASUS All Series/H97-PLUS, BIOS 2306 10/09/2014
    task: ffff8804011944c0 task.stack: ffff880401294000
    RIP: 0010:[<ffffffff8138ce5d>]  [<ffffffff8138ce5d>] mpi_powm+0x32/0x7e6
    RSP: 0018:ffff880401297ad8  EFLAGS: 00010212
    RAX: 0000000000000000 RBX: ffff88040868bec0 RCX: ffff88040868bba0
    RDX: ffff88040868b260 RSI: ffff88040868bec0 RDI: ffff88040868bee0
    RBP: ffff880401297ba8 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000047 R11: ffffffff8183b210 R12: 0000000000000000
    R13: ffff8804087c7600 R14: 000000000000001f R15: ffff880401297c50
    FS:  00007f7a7918c700(0000) GS:ffff88041fb80000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000000 CR3: 0000000401250000 CR4: 00000000001406e0
    Stack:
     ffff88040868bec0 0000000000000020 ffff880401297b00 ffffffff81376cd4
     0000000000000100 ffff880401297b10 ffffffff81376d12 ffff880401297b30
     ffffffff81376f37 0000000000000100 0000000000000000 ffff880401297ba8
    Call Trace:
     [<ffffffff81376cd4>] ? __sg_page_iter_next+0x43/0x66
     [<ffffffff81376d12>] ? sg_miter_get_next_page+0x1b/0x5d
     [<ffffffff81376f37>] ? sg_miter_next+0x17/0xbd
     [<ffffffff8138ba3a>] ? mpi_read_raw_from_sgl+0xf2/0x146
     [<ffffffff8132a95c>] rsa_verify+0x9d/0xee
     [<ffffffff8132acca>] ? pkcs1pad_sg_set_buf+0x2e/0xbb
     [<ffffffff8132af40>] pkcs1pad_verify+0xc0/0xe1
     [<ffffffff8133cb5e>] public_key_verify_signature+0x1b0/0x228
     [<ffffffff8133d974>] x509_check_for_self_signed+0xa1/0xc4
     [<ffffffff8133cdde>] x509_cert_parse+0x167/0x1a1
     [<ffffffff8133d609>] x509_key_preparse+0x21/0x1a1
     [<ffffffff8133c3d7>] asymmetric_key_preparse+0x34/0x61
     [<ffffffff812fc9f3>] key_create_or_update+0x145/0x399
     [<ffffffff812fe227>] SyS_add_key+0x154/0x19e
     [<ffffffff81001c2b>] do_syscall_64+0x80/0x191
     [<ffffffff816825e4>] entry_SYSCALL64_slow_path+0x25/0x25
    Code: 56 41 55 41 54 53 48 81 ec a8 00 00 00 44 8b 71 04 8b 42 04 4c 8b 67 18 45 85 f6 89 45 80 0f 84 b4 06 00 00 85 c0 75 2f 41 ff ce <49> c7 04 24 01 00 00 00 b0 01 75 0b 48 8b 41 18 48 83 38 01 0f
    RIP  [<ffffffff8138ce5d>] mpi_powm+0x32/0x7e6
     RSP <ffff880401297ad8>
    CR2: 0000000000000000
    ---[ end trace d82015255d4a5d8d ]---
    
    Basically, this is a backport of a libgcrypt patch:
    
    	http://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=patch;h=6e1adb05d290aeeb1c230c763970695f4a538526
    
    Fixes: cdec9cb5167a ("crypto: GnuPG based MPI lib - source files (part 1)")
    Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
    Signed-off-by: David Howells <dhowells@redhat.com>
    cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
    cc: linux-ima-devel@lists.sourceforge.net
    cc: stable@vger.kernel.org

diff --git a/lib/mpi/mpi-pow.c b/lib/mpi/mpi-pow.c
index 5464c8744ea9..94c30138bd32 100644
--- a/lib/mpi/mpi-pow.c
+++ b/lib/mpi/mpi-pow.c
@@ -64,6 +64,9 @@ int mpi_powm(MPI res, MPI base, MPI exp, MPI mod)
 	if (!esize) {
 		/* Exponent is zero, result is 1 mod MOD, i.e., 1 or 0
 		 * depending on if MOD equals 1.  */
+		if (RESIZE_IF_NEEDED(res, 1) < 0)
+			return -ENOMEM;
+		rp = res->d;
 		rp[0] = 1;
 		res->nlimbs = (msize == 1 && mod->d[0] == 1) ? 0 : 1;
 		res->sign = 0;