From e3c4abbfa97ed0b7aed36f18b32911ccf76d52c2 Mon Sep 17 00:00:00 2001 From: Dmitry Kasatkin Date: Wed, 5 Nov 2014 17:01:12 +0200 Subject: integrity: define a new function integrity_read_file() This patch defines a new function called integrity_read_file() to read file from the kernel into a buffer. Subsequent patches will read a file containing the public keys and load them onto the IMA keyring. This patch moves and renames ima_kernel_read(), the non-security checking version of kernel_read(), to integrity_kernel_read(). Changes in v3: * Patch descriptions improved (Mimi) * Add missing cast (kbuild test robot) Changes in v2: * configuration option removed * function declared as '__init' Signed-off-by: Dmitry Kasatkin Signed-off-by: Mimi Zohar --- security/integrity/ima/ima_crypto.c | 35 +++-------------------------------- 1 file changed, 3 insertions(+), 32 deletions(-) (limited to 'security/integrity/ima/ima_crypto.c') diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c index d34e7dfc1118..5df4d960d4dc 100644 --- a/security/integrity/ima/ima_crypto.c +++ b/security/integrity/ima/ima_crypto.c @@ -67,36 +67,6 @@ MODULE_PARM_DESC(ahash_bufsize, "Maximum ahash buffer size"); static struct crypto_shash *ima_shash_tfm; static struct crypto_ahash *ima_ahash_tfm; -/** - * ima_kernel_read - read file content - * - * This is a function for reading file content instead of kernel_read(). - * It does not perform locking checks to ensure it cannot be blocked. - * It does not perform security checks because it is irrelevant for IMA. - * - */ -static int ima_kernel_read(struct file *file, loff_t offset, - char *addr, unsigned long count) -{ - mm_segment_t old_fs; - char __user *buf = addr; - ssize_t ret = -EINVAL; - - if (!(file->f_mode & FMODE_READ)) - return -EBADF; - - old_fs = get_fs(); - set_fs(get_ds()); - if (file->f_op->read) - ret = file->f_op->read(file, buf, count, &offset); - else if (file->f_op->aio_read) - ret = do_sync_read(file, buf, count, &offset); - else if (file->f_op->read_iter) - ret = new_sync_read(file, buf, count, &offset); - set_fs(old_fs); - return ret; -} - int __init ima_init_crypto(void) { long rc; @@ -324,7 +294,8 @@ static int ima_calc_file_hash_atfm(struct file *file, } /* read buffer */ rbuf_len = min_t(loff_t, i_size - offset, rbuf_size[active]); - rc = ima_kernel_read(file, offset, rbuf[active], rbuf_len); + rc = integrity_kernel_read(file, offset, rbuf[active], + rbuf_len); if (rc != rbuf_len) goto out3; @@ -417,7 +388,7 @@ static int ima_calc_file_hash_tfm(struct file *file, while (offset < i_size) { int rbuf_len; - rbuf_len = ima_kernel_read(file, offset, rbuf, PAGE_SIZE); + rbuf_len = integrity_kernel_read(file, offset, rbuf, PAGE_SIZE); if (rbuf_len < 0) { rc = rbuf_len; break; -- cgit v1.2.3-59-g8ed1b