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License: GNU Lesser General Public License v3.0
Rust Cryptography Intrinsics
License: GNU Lesser General Public License v3.0
Hello,
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 19 to 24 in 03bfd55
Lines 100 to 111 in 03bfd55
utils::Digest::to_bytes_len()
method & utils::PadBlocks::<I, P, F>::fill_buf()
create an uninitialized buffer and passes it to user-provided Read
implementation or user-provided reader.read_pad()
. This is unsound, because it allows safe Rust code to exhibit an undefined behavior (read from uninitialized memory).
In case a user-provided Read
reads from the given buffer, uninitialized buffer can make safe Rust code to cause memory safety errors by miscompilation. Uninitialized values are lowered to LLVM as llvm::UndefValue
which may take different random values for each read. Propagation of UndefValue
can quickly cause safe Rust code to exhibit undefined behavior.
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.
The Naive & safe way to fix the issue is to always zero-initialize a buffer before lending it to a user-provided Read
implementation. Note that this approach will add runtime performance overhead of zero-initializing the buffer.
As of Feb 2021, there is not yet an ideal fix that works with no performance overhead. Below are links to relevant discussions & suggestions for the fix.
Hi๐ Sorry to bug - but apparently can't find any example of Hardware Accelerated Hash (SHA-2) for Cortex-M0 M4 ARMv7M like PSoC 6 , any ideas - is your code still relevant for ARM? thanx
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