splice: missing user pointer access verification
vmsplice_to_user() must always check the user pointer and length with access_ok() before copying. Likewise, for the slow path of copy_from_user_mmap_sem() we need to check that we may read from the user region. Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Cc: Wojciech Purczynski <cliph@research.coseinc.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1179,6 +1179,9 @@ static int copy_from_user_mmap_sem(void *dst, const void __user *src, size_t n)
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{
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int partial;
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if (!access_ok(VERIFY_READ, src, n))
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return -EFAULT;
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pagefault_disable();
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partial = __copy_from_user_inatomic(dst, src, n);
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pagefault_enable();
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@ -1387,6 +1390,11 @@ static long vmsplice_to_user(struct file *file, const struct iovec __user *iov,
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break;
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}
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if (unlikely(!access_ok(VERIFY_WRITE, base, len))) {
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error = -EFAULT;
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break;
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}
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sd.len = 0;
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sd.total_len = len;
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sd.flags = flags;
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