Date: Wed, 2 Jun 2021 09:53:03 +0200 (CEST) From: Ronald Klop <ronald-lists@klop.ws> To: Kyle Evans <kevans@FreeBSD.org> Cc: dev-commits-src-all@FreeBSD.org, src-committers@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: Re: git: 2d741f33bd07 - main - kern: ether_gen_addr: randomize on default hostuuid, too Message-ID: <2123581522.4.1622620383310@localhost> In-Reply-To: <202106020359.1523xbk3040971@gitrepo.freebsd.org> References: <202106020359.1523xbk3040971@gitrepo.freebsd.org>
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Hi,
Wouldn't it be user friendly to tell why the MAC is random? Something like this.
if (strncmp(uuid, DEFAULT_HOSTUUID, sizeof(uuid)) == 0) {
printf("No /etc/hostuuid found. Fall back to a random mac address.");
goto rando;
}
I know it would save me a lot of time if I would encounter this case.
Plus the message is only printed once on boot.
Regards,
Ronald.
Van: Kyle Evans <kevans@FreeBSD.org>
Datum: woensdag, 2 juni 2021 05:59
Aan: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org
Onderwerp: git: 2d741f33bd07 - main - kern: ether_gen_addr: randomize on default hostuuid, too
>
> The branch main has been updated by kevans:
>
> URL: https://cgit.FreeBSD.org/src/commit/?id=2d741f33bd07bf94a59635db3c7b9e070a8a6e55
>
> commit 2d741f33bd07bf94a59635db3c7b9e070a8a6e55
> Author: Kyle Evans <kevans@FreeBSD.org>
> AuthorDate: 2021-04-16 01:11:35 +0000
> Commit: Kyle Evans <kevans@FreeBSD.org>
> CommitDate: 2021-06-02 03:59:21 +0000
>
> kern: ether_gen_addr: randomize on default hostuuid, too
>
> Currently, this will still hash the default (all zero) hostuuid and
> potentially arrive at a MAC address that has a high chance of collision
> if another interface of the same name appears in the same broadcast
> domain on another host without a hostuuid, e.g., some virtual machine
> setups.
>
> Instead of using the default hostuuid, just treat it as a failure and
> generate a random LA unicast MAC address.
>
> Reviewed by: bz, gbe, imp, kbowling, kp
> MFC after: 1 week
> Differential Revision: https://reviews.freebsd.org/D29788
> ---
> share/man/man9/ether_gen_addr.9 | 5 +++--
> sys/kern/kern_jail.c | 1 -
> sys/net/if_ethersubr.c | 17 ++++++++++++++---
> sys/sys/jail.h | 1 +
> 4 files changed, 18 insertions(+), 6 deletions(-)
>
> diff --git a/share/man/man9/ether_gen_addr.9 b/share/man/man9/ether_gen_addr.9
> index 1b98a841736d..f69cb199e2c3 100644
> --- a/share/man/man9/ether_gen_addr.9
> +++ b/share/man/man9/ether_gen_addr.9
> @@ -61,8 +61,9 @@ or on machines that do not use
> .Xr loader 8 .
> .Pp
> .Nm
> -can fail to derive a MAC address due to memory allocation failure.
> -In this case, a locally-administered unicast MAC address will be randomly
> +can fail to derive a MAC address due to memory allocation failure, or because
> +the hostid has not been populated.
> +In these cases, a locally-administered unicast MAC address will be randomly
> generated and returned via the
> .Ar hwaddr
> parameter.
> diff --git a/sys/kern/kern_jail.c b/sys/kern/kern_jail.c
> index 303e31490eb1..9784f3bfc23b 100644
> --- a/sys/kern/kern_jail.c
> +++ b/sys/kern/kern_jail.c
> @@ -76,7 +76,6 @@ __FBSDID("$FreeBSD$");
>
> #include <security/mac/mac_framework.h>
>
> -#define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
> #define PRISON0_HOSTUUID_MODULE "hostuuid"
>
> MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
> diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
> index 01c2d2f7b3e8..7eb46df8281a 100644
> --- a/sys/net/if_ethersubr.c
> +++ b/sys/net/if_ethersubr.c
> @@ -1443,6 +1443,11 @@ ether_gen_addr(struct ifnet *ifp, struct ether_addr *hwaddr)
> char jailname[MAXHOSTNAMELEN];
>
> getcredhostuuid(curthread->td_ucred, uuid, sizeof(uuid));
> + if (strncmp(uuid, DEFAULT_HOSTUUID, sizeof(uuid)) == 0) {
> + /* Fall back to a random mac address. */
> + goto rando;
> + }
> +
> /* If each (vnet) jail would also have a unique hostuuid this would not
> * be necessary. */
> getjailname(curthread->td_ucred, jailname, sizeof(jailname));
> @@ -1450,9 +1455,7 @@ ether_gen_addr(struct ifnet *ifp, struct ether_addr *hwaddr)
> jailname);
> if (sz < 0) {
> /* Fall back to a random mac address. */
> - arc4rand(hwaddr, sizeof(*hwaddr), 0);
> - hwaddr->octet[0] = 0x02;
> - return;
> + goto rando;
> }
>
> SHA1Init(&ctx);
> @@ -1467,6 +1470,14 @@ ether_gen_addr(struct ifnet *ifp, struct ether_addr *hwaddr)
> hwaddr->octet[i] = addr >> ((ETHER_ADDR_LEN - i - 1) * 8) &
> 0xFF;
> }
> +
> + return;
> +rando:
> + arc4rand(hwaddr, sizeof(*hwaddr), 0);
> + /* Unicast */
> + hwaddr->octet[0] &= 0xFE;
> + /* Locally administered. */
> + hwaddr->octet[0] |= 0x02;
> }
>
> DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
> diff --git a/sys/sys/jail.h b/sys/sys/jail.h
> index c9d4c65e4d9e..76ed377e3f06 100644
> --- a/sys/sys/jail.h
> +++ b/sys/sys/jail.h
> @@ -140,6 +140,7 @@ MALLOC_DECLARE(M_PRISON);
> #include <sys/osd.h>
>
> #define HOSTUUIDLEN 64
> +#define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
> #define OSRELEASELEN 32
>
> struct racct;
> _______________________________________________
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>
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To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org,
dev-commits-src-main@FreeBSD.org
From: Marcin Wojtas <mw@FreeBSD.org>
Subject: git: 9cf66a0458f4 - main - uart_dev_ns8250: Switch ACPI UART subtype
for Marvell SoCs
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The branch main has been updated by mw:
URL: https://cgit.FreeBSD.org/src/commit/?id=9cf66a0458f4913d34cb3c5f6b653c78f70de8a8
commit 9cf66a0458f4913d34cb3c5f6b653c78f70de8a8
Author: Marcin Wojtas <mw@FreeBSD.org>
AuthorDate: 2021-05-20 21:37:02 +0000
Commit: Marcin Wojtas <mw@FreeBSD.org>
CommitDate: 2021-06-02 07:55:19 +0000
uart_dev_ns8250: Switch ACPI UART subtype for Marvell SoCs
DBG2 ACPI table description [1] specifies three subtypes
related to 16550 UART:
0x0 - 16550 compatible
0x1 - 16550 subset
0x12 - 16550 compatible with parameters defined in Generic Address Structure (GAS)
It turned out however, that the Windows OS treats 0x0 subtype as
legacy x86 UART with 8-bit access. ARM SoCs can use types 0x1 (16550 with
fixed mmio32 access) or 0x12 (16550 with fully respected GAS contents).
Switch Marvell SoCs ACPI UART subtype to 0x1 - thanks to that the same firmware
can run properly with UART output in FreeBSD, Windows 10, Linux and ESXI
hypervisor. Tests showed the older firmware versions that use 0x0
UART subtype in SPCR table continue to display output properly.
[1] https://docs.microsoft.com/en-us/windows-hardware/drivers/bringup/acpi-debug-port-table
Obtained from: Semihalf
Sponsored by: ARM
Differential revision: https://reviews.freebsd.org/D30386
MFC after: 2 weeks
---
sys/dev/uart/uart_dev_ns8250.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/sys/dev/uart/uart_dev_ns8250.c b/sys/dev/uart/uart_dev_ns8250.c
index 45b4d315c3d5..859fb352a194 100644
--- a/sys/dev/uart/uart_dev_ns8250.c
+++ b/sys/dev/uart/uart_dev_ns8250.c
@@ -57,6 +57,7 @@ __FBSDID("$FreeBSD$");
#include <dev/uart/uart_ppstypes.h>
#ifdef DEV_ACPI
#include <dev/uart/uart_cpu_acpi.h>
+#include <contrib/dev/acpica/include/acpi.h>
#endif
#include <dev/ic/ns16550.h>
@@ -415,7 +416,7 @@ struct uart_class uart_ns8250_class = {
static struct acpi_uart_compat_data acpi_compat_data[] = {
{"AMD0020", &uart_ns8250_class, 0, 2, 0, 48000000, UART_F_BUSY_DETECT, "AMD / Synopsys Designware UART"},
{"AMDI0020", &uart_ns8250_class, 0, 2, 0, 48000000, UART_F_BUSY_DETECT, "AMD / Synopsys Designware UART"},
- {"MRVL0001", &uart_ns8250_class, 0, 2, 0, 200000000, UART_F_BUSY_DETECT, "Marvell / Synopsys Designware UART"},
+ {"MRVL0001", &uart_ns8250_class, ACPI_DBG2_16550_SUBSET, 2, 0, 200000000, UART_F_BUSY_DETECT, "Marvell / Synopsys Designware UART"},
{"SCX0006", &uart_ns8250_class, 0, 2, 0, 62500000, UART_F_BUSY_DETECT, "SynQuacer / Synopsys Designware UART"},
{"HISI0031", &uart_ns8250_class, 0, 2, 0, 200000000, UART_F_BUSY_DETECT, "HiSilicon / Synopsys Designware UART"},
{"PNP0500", &uart_ns8250_class, 0, 0, 0, 0, 0, "Standard PC COM port"},
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