From 0b9ba6135d7f18b82f3d8bebb55ded725ba88e0e Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" Date: Wed, 13 Jul 2022 01:12:21 +0200 Subject: um: seed rng using host OS rng UML generally does not provide access to special CPU instructions like RDRAND, and execution tends to be rather deterministic, with no real hardware interrupts, making good randomness really very hard, if not all together impossible. Not only is this a security eyebrow raiser, but it's also quite annoying when trying to do various pieces of UML-based automation that takes a long time to boot, if ever. Fix this by trivially calling getrandom() in the host and using that seed as "bootloader randomness", which initializes the rng immediately at UML boot. The old behavior can be restored the same way as on any other arch, by way of CONFIG_TRUST_BOOTLOADER_RANDOMNESS=n or random.trust_bootloader=0. So seen from that perspective, this just makes UML act like other archs, which is positive in its own right. Additionally, wire up arch_get_random_{int,long}() in the same way, so that reseeds can also make use of the host RNG, controllable by CONFIG_TRUST_CPU_RANDOMNESS and random.trust_cpu, per usual. Cc: stable@vger.kernel.org Acked-by: Johannes Berg Acked-By: Anton Ivanov Signed-off-by: Jason A. Donenfeld --- arch/um/include/asm/archrandom.h | 30 ++++++++++++++++++++++++++++++ arch/um/include/shared/os.h | 7 +++++++ 2 files changed, 37 insertions(+) create mode 100644 arch/um/include/asm/archrandom.h (limited to 'arch/um/include') diff --git a/arch/um/include/asm/archrandom.h b/arch/um/include/asm/archrandom.h new file mode 100644 index 000000000000..2f24cb96391d --- /dev/null +++ b/arch/um/include/asm/archrandom.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_UM_ARCHRANDOM_H__ +#define __ASM_UM_ARCHRANDOM_H__ + +#include + +/* This is from , but better not to #include that in a global header here. */ +ssize_t os_getrandom(void *buf, size_t len, unsigned int flags); + +static inline bool __must_check arch_get_random_long(unsigned long *v) +{ + return os_getrandom(v, sizeof(*v), 0) == sizeof(*v); +} + +static inline bool __must_check arch_get_random_int(unsigned int *v) +{ + return os_getrandom(v, sizeof(*v), 0) == sizeof(*v); +} + +static inline bool __must_check arch_get_random_seed_long(unsigned long *v) +{ + return false; +} + +static inline bool __must_check arch_get_random_seed_int(unsigned int *v) +{ + return false; +} + +#endif diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h index fafde1d5416e..0df646c6651e 100644 --- a/arch/um/include/shared/os.h +++ b/arch/um/include/shared/os.h @@ -11,6 +11,12 @@ #include #include #include +/* This is to get size_t */ +#ifndef __UM_HOST__ +#include +#else +#include +#endif #define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR)) @@ -243,6 +249,7 @@ extern void stack_protections(unsigned long address); extern int raw(int fd); extern void setup_machinename(char *machine_out); extern void setup_hostinfo(char *buf, int len); +extern ssize_t os_getrandom(void *buf, size_t len, unsigned int flags); extern void os_dump_core(void) __attribute__ ((noreturn)); extern void um_early_printk(const char *s, unsigned int n); extern void os_fix_helper_signals(void); -- cgit v1.2.3