Revision 8dad53a11f8d94dceb540a5f8f153484f42be84b authored by Christoph Hellwig on 23 July 2021, 22:50:17 UTC, committed by Linus Torvalds on 24 July 2021, 00:43:28 UTC
memcpy_to_page and memzero_page can write to arbitrary pages, which could be in the page cache or in high memory, so call flush_kernel_dcache_pages to flush the dcache. This is a problem when using these helpers on dcache challeneged architectures. Right now there are just a few users, chances are no one used the PC floppy driver, the aha1542 driver for an ISA SCSI HBA, and a few advanced and optional btrfs and ext4 features on those platforms yet since the conversion. Link: https://lkml.kernel.org/r/20210713055231.137602-2-hch@lst.de Fixes: bb90d4bc7b6a ("mm/highmem: Lift memcpy_[to|from]_page to core") Fixes: 28961998f858 ("iov_iter: lift memzero_page() to highmem.h") Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Cc: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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rxrpc-type.h
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* RxRPC key type
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#ifndef _KEYS_RXRPC_TYPE_H
#define _KEYS_RXRPC_TYPE_H
#include <linux/key.h>
/*
* key type for AF_RXRPC keys
*/
extern struct key_type key_type_rxrpc;
extern struct key *rxrpc_get_null_key(const char *);
/*
* RxRPC key for Kerberos IV (type-2 security)
*/
struct rxkad_key {
u32 vice_id;
u32 start; /* time at which ticket starts */
u32 expiry; /* time at which ticket expires */
u32 kvno; /* key version number */
u8 primary_flag; /* T if key for primary cell for this user */
u16 ticket_len; /* length of ticket[] */
u8 session_key[8]; /* DES session key */
u8 ticket[]; /* the encrypted ticket */
};
/*
* list of tokens attached to an rxrpc key
*/
struct rxrpc_key_token {
u16 security_index; /* RxRPC header security index */
bool no_leak_key; /* Don't copy the key to userspace */
struct rxrpc_key_token *next; /* the next token in the list */
union {
struct rxkad_key *kad;
};
};
/*
* structure of raw payloads passed to add_key() or instantiate key
*/
struct rxrpc_key_data_v1 {
u16 security_index;
u16 ticket_length;
u32 expiry; /* time_t */
u32 kvno;
u8 session_key[8];
u8 ticket[];
};
/*
* AF_RXRPC key payload derived from XDR format
* - based on openafs-1.4.10/src/auth/afs_token.xg
*/
#define AFSTOKEN_LENGTH_MAX 16384 /* max payload size */
#define AFSTOKEN_STRING_MAX 256 /* max small string length */
#define AFSTOKEN_DATA_MAX 64 /* max small data length */
#define AFSTOKEN_CELL_MAX 64 /* max cellname length */
#define AFSTOKEN_MAX 8 /* max tokens per payload */
#define AFSTOKEN_BDATALN_MAX 16384 /* max big data length */
#define AFSTOKEN_RK_TIX_MAX 12000 /* max RxKAD ticket size */
#define AFSTOKEN_GK_KEY_MAX 64 /* max GSSAPI key size */
#define AFSTOKEN_GK_TOKEN_MAX 16384 /* max GSSAPI token size */
/*
* Truncate a time64_t to the range from 1970 to 2106 as in the network
* protocol.
*/
static inline u32 rxrpc_time64_to_u32(time64_t time)
{
if (time < 0)
return 0;
if (time > UINT_MAX)
return UINT_MAX;
return (u32)time;
}
/*
* Extend u32 back to time64_t using the same 1970-2106 range.
*/
static inline time64_t rxrpc_u32_to_time64(u32 time)
{
return (time64_t)time;
}
#endif /* _KEYS_RXRPC_TYPE_H */
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