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View Code? Open in Web Editor NEWRandom memory access to sequential data sources
License: Apache License 2.0
Random memory access to sequential data sources
License: Apache License 2.0
Hello ๐ฆ ,
we (Rust group @sslab-gatech) found a memory-safety/soundness issue in this crate while scanning Rust code on crates.io for potential vulnerabilities.
Lines 190 to 225 in 2b3c455
GreedyAccessReader::fill_buf
method creates an uninitialized buffer and passes it to user-provided Read
implementation (self.inner.read(buf)
). This is unsound, because it allows safe Rust code to exhibit an undefined behavior (read from uninitialized memory).
This part from the Read
trait documentation explains the issue:
It is your responsibility to make sure that
buf
is initialized before callingread
. Calling read with an uninitializedbuf
(of the kind one obtains viaMaybeUninit<T>
) is not safe, and can lead to undefined behavior.
It is safe to zero-initialize the newly allocated u8
buffer before read()
, in order to prevent user-provided Read
from reading old contents of the newly allocated heap memory.
The version available on Crates.io
seems to be different from the latest master branch of this repo,
but the same issue exists in GreedyBufReader::fill_buf()
(bra = "0.1.0").
Thank you for checking out this issue ๐
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