mirror of
https://github.com/torvalds/linux
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64baf3cfea
The crypto layer currently uses in_atomic() to determine whether it is allowed to sleep. This is incorrect since spin locks don't always cause in_atomic() to return true. Instead of that, this patch returns to an earlier idea of a per-tfm flag which determines whether sleeping is allowed. Unlike the earlier version, the default is to not allow sleeping. This ensures that no existing code can break. As usual, this flag may either be set through crypto_alloc_tfm(), or just before a specific crypto operation. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/*
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* Cryptographic API.
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*
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#ifndef _CRYPTO_INTERNAL_H
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#define _CRYPTO_INTERNAL_H
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#include <linux/crypto.h>
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <asm/kmap_types.h>
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extern enum km_type crypto_km_types[];
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static inline enum km_type crypto_kmap_type(int out)
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{
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return crypto_km_types[(in_softirq() ? 2 : 0) + out];
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}
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static inline void *crypto_kmap(struct page *page, int out)
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{
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return kmap_atomic(page, crypto_kmap_type(out));
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}
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static inline void crypto_kunmap(void *vaddr, int out)
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{
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kunmap_atomic(vaddr, crypto_kmap_type(out));
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}
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static inline void crypto_yield(struct crypto_tfm *tfm)
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{
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if (tfm->crt_flags & CRYPTO_TFM_REQ_MAY_SLEEP)
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cond_resched();
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}
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#ifdef CONFIG_CRYPTO_HMAC
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int crypto_alloc_hmac_block(struct crypto_tfm *tfm);
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void crypto_free_hmac_block(struct crypto_tfm *tfm);
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#else
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static inline int crypto_alloc_hmac_block(struct crypto_tfm *tfm)
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{
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return 0;
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}
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static inline void crypto_free_hmac_block(struct crypto_tfm *tfm)
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{ }
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#endif
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#ifdef CONFIG_PROC_FS
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void __init crypto_init_proc(void);
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#else
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static inline void crypto_init_proc(void)
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{ }
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#endif
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static inline unsigned int crypto_digest_ctxsize(struct crypto_alg *alg,
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int flags)
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{
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return alg->cra_ctxsize;
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}
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static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg,
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int flags)
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{
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unsigned int len = alg->cra_ctxsize;
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switch (flags & CRYPTO_TFM_MODE_MASK) {
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case CRYPTO_TFM_MODE_CBC:
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len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
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len += alg->cra_blocksize;
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break;
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}
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return len;
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}
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static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg,
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int flags)
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{
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return alg->cra_ctxsize;
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}
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int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags);
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int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags);
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int crypto_init_compress_flags(struct crypto_tfm *tfm, u32 flags);
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int crypto_init_digest_ops(struct crypto_tfm *tfm);
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int crypto_init_cipher_ops(struct crypto_tfm *tfm);
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int crypto_init_compress_ops(struct crypto_tfm *tfm);
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void crypto_exit_digest_ops(struct crypto_tfm *tfm);
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void crypto_exit_cipher_ops(struct crypto_tfm *tfm);
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void crypto_exit_compress_ops(struct crypto_tfm *tfm);
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#endif /* _CRYPTO_INTERNAL_H */
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