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Support BCRYPT_RNG_ALG_HANDLE rust-lang/rust#101325 #2533

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merged 1 commit into from
Sep 3, 2022
Merged

Support BCRYPT_RNG_ALG_HANDLE rust-lang/rust#101325 #2533

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2 changes: 1 addition & 1 deletion rust-version
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Original file line number Diff line number Diff line change
@@ -1 +1 @@
8c6ce6b91b172f77c795a74bfeaf74b865146b3f
47d1cdb0bcac8e417071ce1929d261efe2399ae2
33 changes: 23 additions & 10 deletions src/shims/windows/foreign_items.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -288,19 +288,32 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
let [algorithm, ptr, len, flags] =
this.check_shim(abi, Abi::System { unwind: false }, link_name, args)?;
let algorithm = this.read_scalar(algorithm)?;
let algorithm = algorithm.to_machine_usize(this)?;
let ptr = this.read_pointer(ptr)?;
let len = this.read_scalar(len)?.to_u32()?;
let flags = this.read_scalar(flags)?.to_u32()?;
if flags != 2 {
// ^ BCRYPT_USE_SYSTEM_PREFERRED_RNG
throw_unsup_format!(
"BCryptGenRandom is supported only with the BCRYPT_USE_SYSTEM_PREFERRED_RNG flag"
);
}
if algorithm.to_machine_usize(this)? != 0 {
throw_unsup_format!(
"BCryptGenRandom algorithm must be NULL when the flag is BCRYPT_USE_SYSTEM_PREFERRED_RNG"
);
match flags {
0 => {
// BCRYPT_RNG_ALG_HANDLE
if algorithm != 0x81 {
throw_unsup_format!(
"BCryptGenRandom algorithm must be BCRYPT_RNG_ALG_HANDLE when the flag is 0"
);
}
}
2 => {
// BCRYPT_USE_SYSTEM_PREFERRED_RNG
if algorithm != 0 {
throw_unsup_format!(
"BCryptGenRandom algorithm must be NULL when the flag is BCRYPT_USE_SYSTEM_PREFERRED_RNG"
);
}
}
_ => {
throw_unsup_format!(
"BCryptGenRandom is only supported with BCRYPT_USE_SYSTEM_PREFERRED_RNG or BCRYPT_RNG_ALG_HANDLE"
);
}
}
this.gen_random(ptr, len.into())?;
this.write_null(dest)?; // STATUS_SUCCESS
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