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fix: kernel: cnode: use checked shift right when matching guard

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Paul Pan 2024-06-17 00:42:23 +08:00
parent b62c378a38
commit acaa1b9f46
1 changed files with 2 additions and 1 deletions
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3
kernel/src/objects/cnode.rs
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@ -108,7 +108,8 @@ impl<'a> CNodeCap<'a> {
}); });
} }
let get_guard = || (cap_ptr >> (bits_remaining - guard_bits)) & MASK!(guard_bits); let get_guard =
|| cap_ptr.checked_shr((bits_remaining - guard_bits) as u32).unwrap_or_default() & MASK!(guard_bits);
if guard_bits > bits_remaining || get_guard() != cap_guard { if guard_bits > bits_remaining || get_guard() != cap_guard {
return Err(LookupFailure::GuardMismatch { return Err(LookupFailure::GuardMismatch {
bits_left: bits_remaining, bits_left: bits_remaining,