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ecryptfs fixes

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memcpy() from userland pointer is a Bad Thing(tm)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Al Viro 2008-05-21 06:32:11 +01:00 committed by Linus Torvalds
parent 4ec7ffa2df
commit 79bc12a0a0
1 changed files with 13 additions and 15 deletions
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28
fs/ecryptfs/miscdev.c
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@ -243,7 +243,6 @@ ecryptfs_miscdev_read(struct file *file, char __user *buf, size_t count,
struct ecryptfs_daemon *daemon;
struct ecryptfs_msg_ctx *msg_ctx;
size_t packet_length_size;
u32 counter_nbo;
char packet_length[3];
size_t i;
size_t total_length;
@ -328,20 +327,18 @@ check_list:
"pending message\n", __func__, count, total_length);
goto out_unlock_msg_ctx;
}
i = 0;
buf[i++] = msg_ctx->type;
counter_nbo = cpu_to_be32(msg_ctx->counter);
memcpy(&buf[i], (char *)&counter_nbo, 4);
i += 4;
rc = -EFAULT;
if (put_user(msg_ctx->type, buf))
goto out_unlock_msg_ctx;
if (put_user(cpu_to_be32(msg_ctx->counter), (__be32 __user *)(buf + 1)))
goto out_unlock_msg_ctx;
i = 5;
if (msg_ctx->msg) {
memcpy(&buf[i], packet_length, packet_length_size);
i += packet_length_size;
rc = copy_to_user(&buf[i], msg_ctx->msg, msg_ctx->msg_size);
if (rc) {
printk(KERN_ERR "%s: copy_to_user returned error "
"[%d]\n", __func__, rc);
if (copy_to_user(&buf[i], packet_length, packet_length_size))
goto out_unlock_msg_ctx;
i += packet_length_size;
if (copy_to_user(&buf[i], msg_ctx->msg, msg_ctx->msg_size))
goto out_unlock_msg_ctx;
}
i += msg_ctx->msg_size;
}
rc = i;
@ -452,7 +449,8 @@ static ssize_t
ecryptfs_miscdev_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
u32 counter_nbo, seq;
__be32 counter_nbo;
u32 seq;
size_t packet_size, packet_size_length, i;
ssize_t sz = 0;
char *data;
@ -485,7 +483,7 @@ ecryptfs_miscdev_write(struct file *file, const char __user *buf,
count);
goto out_free;
}
memcpy((char *)&counter_nbo, &data[i], 4);
memcpy(&counter_nbo, &data[i], 4);
seq = be32_to_cpu(counter_nbo);
i += 4;
rc = ecryptfs_parse_packet_length(&data[i], &packet_size,