From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001 From: Shivank Garg Date: Sat, 22 Aug 2026 19:22:05 +0000 Subject: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() runs and may free the dma_device along with its channels. dma_chan_put() then still reads chan->device->owner via dma_chan_to_owner() for the trailing module_put(). KASAN catches it: slab-use-after-free in dma_chan_put+0x3e6/0x4c0 Read of size 8 by task insmod/6319 Freed by task 6319: kfree+0x225/0x470 dma_chan_put+0x395/0x4c0 dmaengine_put+0xf8/0x160 Cache the module owner in dma_chan_put() before the put so the trailing module_put() does not need chan->device. Fixes: 8ad342a86359 ("dmaengine: Add reference counting to dma_device struct") Suggested-by: Sashiko Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com Reviewed-by: Frank Li Reviewed-by: Logan Gunthorpe Signed-off-by: Shivank Garg Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com Signed-off-by: Vinod Koul --- net/ceph/crypto.h | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 net/ceph/crypto.h (limited to 'net/ceph/crypto.h') diff --git a/net/ceph/crypto.h b/net/ceph/crypto.h new file mode 100644 index 000000000..3a2ade15a --- /dev/null +++ b/net/ceph/crypto.h @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _FS_CEPH_CRYPTO_H +#define _FS_CEPH_CRYPTO_H + +#include +#include +#include + +#define CEPH_MAX_KEY_LEN 32 +#define CEPH_MAX_CON_SECRET_LEN 64 + +/* + * cryptographic secret + */ +struct ceph_crypto_key { + int type; + struct ceph_timespec created; + int len; + void *key; + + union { + struct crypto_sync_skcipher *aes_tfm; + struct { + struct hmac_sha256_key hmac_key; + const struct krb5_enctype *krb5_type; + struct crypto_aead *krb5_tfms[3]; + }; + }; +}; + +int ceph_crypto_key_prepare(struct ceph_crypto_key *key, + const u32 *key_usages, int key_usage_cnt); +int ceph_crypto_key_clone(struct ceph_crypto_key *dst, + const struct ceph_crypto_key *src); +int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end); +int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *in); +void ceph_crypto_key_destroy(struct ceph_crypto_key *key); + +/* crypto.c */ +int ceph_crypt(const struct ceph_crypto_key *key, int usage_slot, bool encrypt, + void *buf, int buf_len, int in_len, int *pout_len); +int ceph_crypt_data_offset(const struct ceph_crypto_key *key); +int ceph_crypt_buflen(const struct ceph_crypto_key *key, int data_len); +void ceph_hmac_sha256(const struct ceph_crypto_key *key, const void *buf, + int buf_len, u8 hmac[SHA256_DIGEST_SIZE]); +int ceph_crypto_init(void); +void ceph_crypto_shutdown(void); + +/* armor.c */ +int ceph_armor(char *dst, const char *src, const char *end); +int ceph_unarmor(char *dst, const char *src, const char *end); + +#endif -- cgit v1.3.1