linux-stable.git/drivers/net/wireguard, branch v5.15.78 Linux kernel stable tree wireguard: netlink: avoid variable-sized memcpy on sockaddr 2022-09-28T09:11:51+00:00 Jason A. Donenfeld Jason@zx2c4.com 2022-09-16T14:37:40+00:00 c60801e4e2b5602b67ca04cf8c0d196458efd153 [ Upstream commit 26c013108c12b94bc023bf19198a4300596c98b1 ] Doing a variable-sized memcpy is slower, and the compiler isn't smart enough to turn this into a constant-size assignment. Further, Kees' latest fortified memcpy will actually bark, because the destination pointer is type sockaddr, not explicitly sockaddr_in or sockaddr_in6, so it thinks there's an overflow: memcpy: detected field-spanning write (size 28) of single field "&endpoint.addr" at drivers/net/wireguard/netlink.c:446 (size 16) Fix this by just assigning by using explicit casts for each checked case. Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reported-by: syzbot+a448cda4dba2dac50de5@syzkaller.appspotmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 26c013108c12b94bc023bf19198a4300596c98b1 ]

Doing a variable-sized memcpy is slower, and the compiler isn't smart
enough to turn this into a constant-size assignment.

Further, Kees' latest fortified memcpy will actually bark, because the
destination pointer is type sockaddr, not explicitly sockaddr_in or
sockaddr_in6, so it thinks there's an overflow:

    memcpy: detected field-spanning write (size 28) of single field
    "&endpoint.addr" at drivers/net/wireguard/netlink.c:446 (size 16)

Fix this by just assigning by using explicit casts for each checked
case.

Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reported-by: syzbot+a448cda4dba2dac50de5@syzkaller.appspotmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
wireguard: ratelimiter: disable timings test by default 2022-09-28T09:11:50+00:00 Jason A. Donenfeld Jason@zx2c4.com 2022-09-16T14:37:38+00:00 3ebf690d1cde8d5f670a55116e043de10da81703 [ Upstream commit 684dec3cf45da2b0848298efae4adf3b2aeafeda ] A previous commit tried to make the ratelimiter timings test more reliable but in the process made it less reliable on other configurations. This is an impossible problem to solve without increasingly ridiculous heuristics. And it's not even a problem that actually needs to be solved in any comprehensive way, since this is only ever used during development. So just cordon this off with a DEBUG_ ifdef, just like we do for the trie's randomized tests, so it can be enabled while hacking on the code, and otherwise disabled in CI. In the process we also revert 151c8e499f47. Fixes: 151c8e499f47 ("wireguard: ratelimiter: use hrtimer in selftest") Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 684dec3cf45da2b0848298efae4adf3b2aeafeda ]

A previous commit tried to make the ratelimiter timings test more
reliable but in the process made it less reliable on other
configurations. This is an impossible problem to solve without
increasingly ridiculous heuristics. And it's not even a problem that
actually needs to be solved in any comprehensive way, since this is only
ever used during development. So just cordon this off with a DEBUG_
ifdef, just like we do for the trie's randomized tests, so it can be
enabled while hacking on the code, and otherwise disabled in CI. In the
process we also revert 151c8e499f47.

Fixes: 151c8e499f47 ("wireguard: ratelimiter: use hrtimer in selftest")
Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
wireguard: allowedips: don't corrupt stack when detecting overflow 2022-08-17T12:23:37+00:00 Jason A. Donenfeld Jason@zx2c4.com 2022-08-02T12:56:12+00:00 c36369f7db87e7d0a5c46700355c313df88263e7 [ Upstream commit c31b14d86dfe7174361e8c6e5df6c2c3a4d5918c ] In case push_rcu() and related functions are buggy, there's a WARN_ON(len >= 128), which the selftest tries to hit by being tricky. In case it is hit, we shouldn't corrupt the kernel's stack, though; otherwise it may be hard to even receive the report that it's buggy. So conditionalize the stack write based on that WARN_ON()'s return value. Note that this never *actually* happens anyway. The WARN_ON() in the first place is bounded by IS_ENABLED(DEBUG), and isn't expected to ever actually hit. This is just a debugging sanity check. Additionally, hoist the constant 128 into a named enum, MAX_ALLOWEDIPS_BITS, so that it's clear why this value is chosen. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/all/CAHk-=wjJZGA6w_DxA+k7Ejbqsq+uGK==koPai3sqdsfJqemvag@mail.gmail.com/ Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit c31b14d86dfe7174361e8c6e5df6c2c3a4d5918c ]

In case push_rcu() and related functions are buggy, there's a
WARN_ON(len >= 128), which the selftest tries to hit by being tricky. In
case it is hit, we shouldn't corrupt the kernel's stack, though;
otherwise it may be hard to even receive the report that it's buggy. So
conditionalize the stack write based on that WARN_ON()'s return value.

Note that this never *actually* happens anyway. The WARN_ON() in the
first place is bounded by IS_ENABLED(DEBUG), and isn't expected to ever
actually hit. This is just a debugging sanity check.

Additionally, hoist the constant 128 into a named enum,
MAX_ALLOWEDIPS_BITS, so that it's clear why this value is chosen.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/all/CAHk-=wjJZGA6w_DxA+k7Ejbqsq+uGK==koPai3sqdsfJqemvag@mail.gmail.com/
Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
wireguard: ratelimiter: use hrtimer in selftest 2022-08-17T12:23:37+00:00 Jason A. Donenfeld Jason@zx2c4.com 2022-08-02T12:56:10+00:00 73ccc2b153a2deea1e8b535627aa95a9ccd921a4 [ Upstream commit 151c8e499f4705010780189377f85b57400ccbf5 ] Using msleep() is problematic because it's compared against ratelimiter.c's ktime_get_coarse_boottime_ns(), which means on systems with slow jiffies (such as UML's forced HZ=100), the result is inaccurate. So switch to using schedule_hrtimeout(). However, hrtimer gives us access only to the traditional posix timers, and none of the _COARSE variants. So now, rather than being too imprecise like jiffies, it's too precise. One solution would be to give it a large "range" value, but this will still fire early on a loaded system. A better solution is to align the timeout to the actual coarse timer, and then round up to the nearest tick, plus change. So add the timeout to the current coarse time, and then schedule_hrtimer() until the absolute computed time. This should hopefully reduce flakes in CI as well. Note that we keep the retry loop in case the entire function is running behind, because the test could still be scheduled out, by either the kernel or by the hypervisor's kernel, in which case restarting the test and hoping to not be scheduled out still helps. Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 151c8e499f4705010780189377f85b57400ccbf5 ]

Using msleep() is problematic because it's compared against
ratelimiter.c's ktime_get_coarse_boottime_ns(), which means on systems
with slow jiffies (such as UML's forced HZ=100), the result is
inaccurate. So switch to using schedule_hrtimeout().

However, hrtimer gives us access only to the traditional posix timers,
and none of the _COARSE variants. So now, rather than being too
imprecise like jiffies, it's too precise.

One solution would be to give it a large "range" value, but this will
still fire early on a loaded system. A better solution is to align the
timeout to the actual coarse timer, and then round up to the nearest
tick, plus change.

So add the timeout to the current coarse time, and then
schedule_hrtimer() until the absolute computed time.

This should hopefully reduce flakes in CI as well. Note that we keep the
retry loop in case the entire function is running behind, because the
test could still be scheduled out, by either the kernel or by the
hypervisor's kernel, in which case restarting the test and hoping to not
be scheduled out still helps.

Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
lib/crypto: blake2s: move hmac construction into wireguard 2022-05-30T07:28:59+00:00 Jason A. Donenfeld Jason@zx2c4.com 2022-01-11T13:37:41+00:00 cba2195416d4c0719ba80fc2182ffa3cee71fb24 commit d8d83d8ab0a453e17e68b3a3bed1f940c34b8646 upstream. Basically nobody should use blake2s in an HMAC construction; it already has a keyed variant. But unfortunately for historical reasons, Noise, used by WireGuard, uses HKDF quite strictly, which means we have to use this. Because this really shouldn't be used by others, this commit moves it into wireguard's noise.c locally, so that kernels that aren't using WireGuard don't get this superfluous code baked in. On m68k systems, this shaves off ~314 bytes. Cc: Herbert Xu <herbert@gondor.apana.org.au> Tested-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit d8d83d8ab0a453e17e68b3a3bed1f940c34b8646 upstream.

Basically nobody should use blake2s in an HMAC construction; it already
has a keyed variant. But unfortunately for historical reasons, Noise,
used by WireGuard, uses HKDF quite strictly, which means we have to use
this. Because this really shouldn't be used by others, this commit moves
it into wireguard's noise.c locally, so that kernels that aren't using
WireGuard don't get this superfluous code baked in. On m68k systems,
this shaves off ~314 bytes.

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
wireguard: device: check for metadata_dst with skb_valid_dst() 2022-05-09T07:14:35+00:00 Nikolay Aleksandrov razor@blackwall.org 2022-04-21T13:48:05+00:00 37a04788c5733271a0854734934c3a58498ea62f [ Upstream commit 45ac774c33d834fe9d4de06ab5f1022fe8cd2071 ] When we try to transmit an skb with md_dst attached through wireguard we hit a null pointer dereference in wg_xmit() due to the use of dst_mtu() which calls into dst_blackhole_mtu() which in turn tries to dereference dst->dev. Since wireguard doesn't use md_dsts we should use skb_valid_dst(), which checks for DST_METADATA flag, and if it's set, then falls back to wireguard's device mtu. That gives us the best chance of transmitting the packet; otherwise if the blackhole netdev is used we'd get ETH_MIN_MTU. [ 263.693506] BUG: kernel NULL pointer dereference, address: 00000000000000e0 [ 263.693908] #PF: supervisor read access in kernel mode [ 263.694174] #PF: error_code(0x0000) - not-present page [ 263.694424] PGD 0 P4D 0 [ 263.694653] Oops: 0000 [#1] PREEMPT SMP NOPTI [ 263.694876] CPU: 5 PID: 951 Comm: mausezahn Kdump: loaded Not tainted 5.18.0-rc1+ #522 [ 263.695190] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1.fc35 04/01/2014 [ 263.695529] RIP: 0010:dst_blackhole_mtu+0x17/0x20 [ 263.695770] Code: 00 00 00 0f 1f 44 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8b 47 10 48 83 e0 fc 8b 40 04 85 c0 75 09 48 8b 07 <8b> 80 e0 00 00 00 c3 66 90 0f 1f 44 00 00 48 89 d7 be 01 00 00 00 [ 263.696339] RSP: 0018:ffffa4a4422fbb28 EFLAGS: 00010246 [ 263.696600] RAX: 0000000000000000 RBX: ffff8ac9c3553000 RCX: 0000000000000000 [ 263.696891] RDX: 0000000000000401 RSI: 00000000fffffe01 RDI: ffffc4a43fb48900 [ 263.697178] RBP: ffffa4a4422fbb90 R08: ffffffff9622635e R09: 0000000000000002 [ 263.697469] R10: ffffffff9b69a6c0 R11: ffffa4a4422fbd0c R12: ffff8ac9d18b1a00 [ 263.697766] R13: ffff8ac9d0ce1840 R14: ffff8ac9d18b1a00 R15: ffff8ac9c3553000 [ 263.698054] FS: 00007f3704c337c0(0000) GS:ffff8acaebf40000(0000) knlGS:0000000000000000 [ 263.698470] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 263.698826] CR2: 00000000000000e0 CR3: 0000000117a5c000 CR4: 00000000000006e0 [ 263.699214] Call Trace: [ 263.699505] <TASK> [ 263.699759] wg_xmit+0x411/0x450 [ 263.700059] ? bpf_skb_set_tunnel_key+0x46/0x2d0 [ 263.700382] ? dev_queue_xmit_nit+0x31/0x2b0 [ 263.700719] dev_hard_start_xmit+0xd9/0x220 [ 263.701047] __dev_queue_xmit+0x8b9/0xd30 [ 263.701344] __bpf_redirect+0x1a4/0x380 [ 263.701664] __dev_queue_xmit+0x83b/0xd30 [ 263.701961] ? packet_parse_headers+0xb4/0xf0 [ 263.702275] packet_sendmsg+0x9a8/0x16a0 [ 263.702596] ? _raw_spin_unlock_irqrestore+0x23/0x40 [ 263.702933] sock_sendmsg+0x5e/0x60 [ 263.703239] __sys_sendto+0xf0/0x160 [ 263.703549] __x64_sys_sendto+0x20/0x30 [ 263.703853] do_syscall_64+0x3b/0x90 [ 263.704162] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 263.704494] RIP: 0033:0x7f3704d50506 [ 263.704789] Code: 48 c7 c0 ff ff ff ff eb b7 66 2e 0f 1f 84 00 00 00 00 00 90 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 72 c3 90 55 48 83 ec 30 44 89 4c 24 2c 4c 89 [ 263.705652] RSP: 002b:00007ffe954b0b88 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 263.706141] RAX: ffffffffffffffda RBX: 0000558bb259b490 RCX: 00007f3704d50506 [ 263.706544] RDX: 000000000000004a RSI: 0000558bb259b7b2 RDI: 0000000000000003 [ 263.706952] RBP: 0000000000000000 R08: 00007ffe954b0b90 R09: 0000000000000014 [ 263.707339] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe954b0b90 [ 263.707735] R13: 000000000000004a R14: 0000558bb259b7b2 R15: 0000000000000001 [ 263.708132] </TASK> [ 263.708398] Modules linked in: bridge netconsole bonding [last unloaded: bridge] [ 263.708942] CR2: 00000000000000e0 Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") Link: https://github.com/cilium/cilium/issues/19428 Reported-by: Martynas Pumputis <m@lambda.lt> Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 45ac774c33d834fe9d4de06ab5f1022fe8cd2071 ]

When we try to transmit an skb with md_dst attached through wireguard
we hit a null pointer dereference in wg_xmit() due to the use of
dst_mtu() which calls into dst_blackhole_mtu() which in turn tries to
dereference dst->dev.

Since wireguard doesn't use md_dsts we should use skb_valid_dst(), which
checks for DST_METADATA flag, and if it's set, then falls back to
wireguard's device mtu. That gives us the best chance of transmitting
the packet; otherwise if the blackhole netdev is used we'd get
ETH_MIN_MTU.

 [  263.693506] BUG: kernel NULL pointer dereference, address: 00000000000000e0
 [  263.693908] #PF: supervisor read access in kernel mode
 [  263.694174] #PF: error_code(0x0000) - not-present page
 [  263.694424] PGD 0 P4D 0
 [  263.694653] Oops: 0000 [#1] PREEMPT SMP NOPTI
 [  263.694876] CPU: 5 PID: 951 Comm: mausezahn Kdump: loaded Not tainted 5.18.0-rc1+ #522
 [  263.695190] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1.fc35 04/01/2014
 [  263.695529] RIP: 0010:dst_blackhole_mtu+0x17/0x20
 [  263.695770] Code: 00 00 00 0f 1f 44 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8b 47 10 48 83 e0 fc 8b 40 04 85 c0 75 09 48 8b 07 <8b> 80 e0 00 00 00 c3 66 90 0f 1f 44 00 00 48 89 d7 be 01 00 00 00
 [  263.696339] RSP: 0018:ffffa4a4422fbb28 EFLAGS: 00010246
 [  263.696600] RAX: 0000000000000000 RBX: ffff8ac9c3553000 RCX: 0000000000000000
 [  263.696891] RDX: 0000000000000401 RSI: 00000000fffffe01 RDI: ffffc4a43fb48900
 [  263.697178] RBP: ffffa4a4422fbb90 R08: ffffffff9622635e R09: 0000000000000002
 [  263.697469] R10: ffffffff9b69a6c0 R11: ffffa4a4422fbd0c R12: ffff8ac9d18b1a00
 [  263.697766] R13: ffff8ac9d0ce1840 R14: ffff8ac9d18b1a00 R15: ffff8ac9c3553000
 [  263.698054] FS:  00007f3704c337c0(0000) GS:ffff8acaebf40000(0000) knlGS:0000000000000000
 [  263.698470] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 [  263.698826] CR2: 00000000000000e0 CR3: 0000000117a5c000 CR4: 00000000000006e0
 [  263.699214] Call Trace:
 [  263.699505]  <TASK>
 [  263.699759]  wg_xmit+0x411/0x450
 [  263.700059]  ? bpf_skb_set_tunnel_key+0x46/0x2d0
 [   263.700382]  ? dev_queue_xmit_nit+0x31/0x2b0
 [  263.700719]  dev_hard_start_xmit+0xd9/0x220
 [  263.701047]  __dev_queue_xmit+0x8b9/0xd30
 [  263.701344]  __bpf_redirect+0x1a4/0x380
 [  263.701664]  __dev_queue_xmit+0x83b/0xd30
 [  263.701961]  ? packet_parse_headers+0xb4/0xf0
 [  263.702275]  packet_sendmsg+0x9a8/0x16a0
 [  263.702596]  ? _raw_spin_unlock_irqrestore+0x23/0x40
 [  263.702933]  sock_sendmsg+0x5e/0x60
 [  263.703239]  __sys_sendto+0xf0/0x160
 [  263.703549]  __x64_sys_sendto+0x20/0x30
 [  263.703853]  do_syscall_64+0x3b/0x90
 [  263.704162]  entry_SYSCALL_64_after_hwframe+0x44/0xae
 [  263.704494] RIP: 0033:0x7f3704d50506
 [  263.704789] Code: 48 c7 c0 ff ff ff ff eb b7 66 2e 0f 1f 84 00 00 00 00 00 90 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 72 c3 90 55 48 83 ec 30 44 89 4c 24 2c 4c 89
 [  263.705652] RSP: 002b:00007ffe954b0b88 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
 [  263.706141] RAX: ffffffffffffffda RBX: 0000558bb259b490 RCX: 00007f3704d50506
 [  263.706544] RDX: 000000000000004a RSI: 0000558bb259b7b2 RDI: 0000000000000003
 [  263.706952] RBP: 0000000000000000 R08: 00007ffe954b0b90 R09: 0000000000000014
 [  263.707339] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe954b0b90
 [  263.707735] R13: 000000000000004a R14: 0000558bb259b7b2 R15: 0000000000000001
 [  263.708132]  </TASK>
 [  263.708398] Modules linked in: bridge netconsole bonding [last unloaded: bridge]
 [  263.708942] CR2: 00000000000000e0

Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Link: https://github.com/cilium/cilium/issues/19428
Reported-by: Martynas Pumputis <m@lambda.lt>
Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
wireguard: socket: ignore v6 endpoints when ipv6 is disabled 2022-04-08T12:24:09+00:00 Jason A. Donenfeld Jason@zx2c4.com 2022-03-30T01:31:27+00:00 9af42a4f6d81b96b123f3ec22a4dcb906c6d00e7 commit 77fc73ac89be96ec8f39e8efa53885caa7cb3645 upstream. The previous commit fixed a memory leak on the send path in the event that IPv6 is disabled at compile time, but how did a packet even arrive there to begin with? It turns out we have previously allowed IPv6 endpoints even when IPv6 support is disabled at compile time. This is awkward and inconsistent. Instead, let's just ignore all things IPv6, the same way we do other malformed endpoints, in the case where IPv6 is disabled. Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 77fc73ac89be96ec8f39e8efa53885caa7cb3645 upstream.

The previous commit fixed a memory leak on the send path in the event
that IPv6 is disabled at compile time, but how did a packet even arrive
there to begin with? It turns out we have previously allowed IPv6
endpoints even when IPv6 support is disabled at compile time. This is
awkward and inconsistent. Instead, let's just ignore all things IPv6,
the same way we do other malformed endpoints, in the case where IPv6 is
disabled.

Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
wireguard: socket: free skb in send6 when ipv6 is disabled 2022-04-08T12:24:09+00:00 Wang Hai wanghai38@huawei.com 2022-03-30T01:31:26+00:00 402991a9771587acc2947cf6c4d689c5397f2258 commit bbbf962d9460194993ee1943a793a0a0af4a7fbf upstream. I got a memory leak report: unreferenced object 0xffff8881191fc040 (size 232): comm "kworker/u17:0", pid 23193, jiffies 4295238848 (age 3464.870s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff814c3ef4>] slab_post_alloc_hook+0x84/0x3b0 [<ffffffff814c8977>] kmem_cache_alloc_node+0x167/0x340 [<ffffffff832974fb>] __alloc_skb+0x1db/0x200 [<ffffffff82612b5d>] wg_socket_send_buffer_to_peer+0x3d/0xc0 [<ffffffff8260e94a>] wg_packet_send_handshake_initiation+0xfa/0x110 [<ffffffff8260ec81>] wg_packet_handshake_send_worker+0x21/0x30 [<ffffffff8119c558>] process_one_work+0x2e8/0x770 [<ffffffff8119ca2a>] worker_thread+0x4a/0x4b0 [<ffffffff811a88e0>] kthread+0x120/0x160 [<ffffffff8100242f>] ret_from_fork+0x1f/0x30 In function wg_socket_send_buffer_as_reply_to_skb() or wg_socket_send_ buffer_to_peer(), the semantics of send6() is required to free skb. But when CONFIG_IPV6 is disable, kfree_skb() is missing. This patch adds it to fix this bug. Signed-off-by: Wang Hai <wanghai38@huawei.com> Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit bbbf962d9460194993ee1943a793a0a0af4a7fbf upstream.

I got a memory leak report:

unreferenced object 0xffff8881191fc040 (size 232):
  comm "kworker/u17:0", pid 23193, jiffies 4295238848 (age 3464.870s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff814c3ef4>] slab_post_alloc_hook+0x84/0x3b0
    [<ffffffff814c8977>] kmem_cache_alloc_node+0x167/0x340
    [<ffffffff832974fb>] __alloc_skb+0x1db/0x200
    [<ffffffff82612b5d>] wg_socket_send_buffer_to_peer+0x3d/0xc0
    [<ffffffff8260e94a>] wg_packet_send_handshake_initiation+0xfa/0x110
    [<ffffffff8260ec81>] wg_packet_handshake_send_worker+0x21/0x30
    [<ffffffff8119c558>] process_one_work+0x2e8/0x770
    [<ffffffff8119ca2a>] worker_thread+0x4a/0x4b0
    [<ffffffff811a88e0>] kthread+0x120/0x160
    [<ffffffff8100242f>] ret_from_fork+0x1f/0x30

In function wg_socket_send_buffer_as_reply_to_skb() or wg_socket_send_
buffer_to_peer(), the semantics of send6() is required to free skb. But
when CONFIG_IPV6 is disable, kfree_skb() is missing. This patch adds it
to fix this bug.

Signed-off-by: Wang Hai <wanghai38@huawei.com>
Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
wireguard: queueing: use CFI-safe ptr_ring cleanup function 2022-04-08T12:24:09+00:00 Jason A. Donenfeld Jason@zx2c4.com 2022-03-30T01:31:24+00:00 6a7245252fdc63f8f651f26d6ee80aed37f0869b commit ec59f128a9bd4255798abb1e06ac3b442f46ef68 upstream. We make too nuanced use of ptr_ring to entirely move to the skb_array wrappers, but we at least should avoid the naughty function pointer cast when cleaning up skbs. Otherwise RAP/CFI will honk at us. This patch uses the __skb_array_destroy_skb wrapper for the cleanup, rather than directly providing kfree_skb, which is what other drivers in the same situation do too. Reported-by: PaX Team <pageexec@freemail.hu> Fixes: 886fcee939ad ("wireguard: receive: use ring buffer for incoming handshakes") Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit ec59f128a9bd4255798abb1e06ac3b442f46ef68 upstream.

We make too nuanced use of ptr_ring to entirely move to the skb_array
wrappers, but we at least should avoid the naughty function pointer cast
when cleaning up skbs. Otherwise RAP/CFI will honk at us. This patch
uses the __skb_array_destroy_skb wrapper for the cleanup, rather than
directly providing kfree_skb, which is what other drivers in the same
situation do too.

Reported-by: PaX Team <pageexec@freemail.hu>
Fixes: 886fcee939ad ("wireguard: receive: use ring buffer for incoming handshakes")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
wireguard: ratelimiter: use kvcalloc() instead of kvzalloc() 2021-12-08T08:04:46+00:00 Gustavo A. R. Silva gustavoars@kernel.org 2021-11-29T15:39:28+00:00 d5f50794a49f1c92443eb0d7d166df98f5a8a724 commit 4e3fd721710553832460c179c2ee5ce67ef7f1e0 upstream. Use 2-factor argument form kvcalloc() instead of kvzalloc(). Link: https://github.com/KSPP/linux/issues/162 Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> [Jason: Gustavo's link above is for KSPP, but this isn't actually a security fix, as table_size is bounded to 8192 anyway, and gcc realizes this, so the codegen comes out to be about the same.] Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 4e3fd721710553832460c179c2ee5ce67ef7f1e0 upstream.

Use 2-factor argument form kvcalloc() instead of kvzalloc().

Link: https://github.com/KSPP/linux/issues/162
Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
[Jason: Gustavo's link above is for KSPP, but this isn't actually a
 security fix, as table_size is bounded to 8192 anyway, and gcc realizes
 this, so the codegen comes out to be about the same.]
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>