Revision c460e7896e6906d4e154f2e7fb7f40d46edbd006 authored by Linus Torvalds on 24 October 2021, 16:43:59 UTC, committed by Linus Torvalds on 24 October 2021, 16:43:59 UTC
Pull ksmbd fixes from Steve French: "Ten fixes for the ksmbd kernel server, for improved security and additional buffer overflow checks: - a security improvement to session establishment to reduce the possibility of dictionary attacks - fix to ensure that maximum i/o size negotiated in the protocol is not less than 64K and not more than 8MB to better match expected behavior - fix for crediting (flow control) important to properly verify that sufficient credits are available for the requested operation - seven additional buffer overflow, buffer validation checks" * tag '5.15-rc6-ksmbd-fixes' of git://git.samba.org/ksmbd: ksmbd: add buffer validation in session setup ksmbd: throttle session setup failures to avoid dictionary attacks ksmbd: validate OutputBufferLength of QUERY_DIR, QUERY_INFO, IOCTL requests ksmbd: validate credit charge after validating SMB2 PDU body size ksmbd: add buffer validation for smb direct ksmbd: limit read/write/trans buffer size not to exceed 8MB ksmbd: validate compound response buffer ksmbd: fix potencial 32bit overflow from data area check in smb2_write ksmbd: improve credits management ksmbd: add validation in smb2_ioctl
hyperv_timer.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Definitions for the clocksource provided by the Hyper-V
* hypervisor to guest VMs, as described in the Hyper-V Top
* Level Functional Spec (TLFS).
*
* Copyright (C) 2019, Microsoft, Inc.
*
* Author: Michael Kelley <mikelley@microsoft.com>
*/
#ifndef __CLKSOURCE_HYPERV_TIMER_H
#define __CLKSOURCE_HYPERV_TIMER_H
#include <linux/clocksource.h>
#include <linux/math64.h>
#include <asm/mshyperv.h>
#define HV_MAX_MAX_DELTA_TICKS 0xffffffff
#define HV_MIN_DELTA_TICKS 1
#ifdef CONFIG_HYPERV_TIMER
/* Routines called by the VMbus driver */
extern int hv_stimer_alloc(bool have_percpu_irqs);
extern int hv_stimer_cleanup(unsigned int cpu);
extern void hv_stimer_legacy_init(unsigned int cpu, int sint);
extern void hv_stimer_legacy_cleanup(unsigned int cpu);
extern void hv_stimer_global_cleanup(void);
extern void hv_stimer0_isr(void);
extern void hv_init_clocksource(void);
extern struct ms_hyperv_tsc_page *hv_get_tsc_page(void);
static inline notrace u64
hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg, u64 *cur_tsc)
{
u64 scale, offset;
u32 sequence;
/*
* The protocol for reading Hyper-V TSC page is specified in Hypervisor
* Top-Level Functional Specification ver. 3.0 and above. To get the
* reference time we must do the following:
* - READ ReferenceTscSequence
* A special '0' value indicates the time source is unreliable and we
* need to use something else. The currently published specification
* versions (up to 4.0b) contain a mistake and wrongly claim '-1'
* instead of '0' as the special value, see commit c35b82ef0294.
* - ReferenceTime =
* ((RDTSC() * ReferenceTscScale) >> 64) + ReferenceTscOffset
* - READ ReferenceTscSequence again. In case its value has changed
* since our first reading we need to discard ReferenceTime and repeat
* the whole sequence as the hypervisor was updating the page in
* between.
*/
do {
sequence = READ_ONCE(tsc_pg->tsc_sequence);
if (!sequence)
return U64_MAX;
/*
* Make sure we read sequence before we read other values from
* TSC page.
*/
smp_rmb();
scale = READ_ONCE(tsc_pg->tsc_scale);
offset = READ_ONCE(tsc_pg->tsc_offset);
*cur_tsc = hv_get_raw_timer();
/*
* Make sure we read sequence after we read all other values
* from TSC page.
*/
smp_rmb();
} while (READ_ONCE(tsc_pg->tsc_sequence) != sequence);
return mul_u64_u64_shr(*cur_tsc, scale, 64) + offset;
}
static inline notrace u64
hv_read_tsc_page(const struct ms_hyperv_tsc_page *tsc_pg)
{
u64 cur_tsc;
return hv_read_tsc_page_tsc(tsc_pg, &cur_tsc);
}
#else /* CONFIG_HYPERV_TIMER */
static inline struct ms_hyperv_tsc_page *hv_get_tsc_page(void)
{
return NULL;
}
static inline u64 hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg,
u64 *cur_tsc)
{
return U64_MAX;
}
static inline int hv_stimer_cleanup(unsigned int cpu) { return 0; }
static inline void hv_stimer_legacy_init(unsigned int cpu, int sint) {}
static inline void hv_stimer_legacy_cleanup(unsigned int cpu) {}
static inline void hv_stimer_global_cleanup(void) {}
static inline void hv_stimer0_isr(void) {}
#endif /* CONFIG_HYPERV_TIMER */
#endif
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