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adjust offset_from logic: check that both pointers are in-bounds

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This commit is contained in:
Ralf Jung 2022-03-10 18:30:32 -05:00
parent 458262b131
commit 63ed8e41ce
6 changed files with 100 additions and 46 deletions
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6
compiler/rustc_middle/src/mir/interpret/error.rs
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@ -184,6 +184,8 @@ pub enum CheckInAllocMsg {
MemoryAccessTest,
/// We are doing pointer arithmetic.
PointerArithmeticTest,
/// We are doing pointer offset_from.
OffsetFromTest,
/// None of the above -- generic/unspecific inbounds test.
InboundsTest,
}
@ -199,6 +201,7 @@ impl fmt::Display for CheckInAllocMsg {
CheckInAllocMsg::DerefTest => "dereferencing pointer failed: ",
CheckInAllocMsg::MemoryAccessTest => "memory access failed: ",
CheckInAllocMsg::PointerArithmeticTest => "pointer arithmetic failed: ",
CheckInAllocMsg::OffsetFromTest => "out-of-bounds offset_from: ",
CheckInAllocMsg::InboundsTest => "",
}
)
@ -358,6 +361,9 @@ impl fmt::Display for UndefinedBehaviorInfo<'_> {
DanglingIntPointer(0, CheckInAllocMsg::InboundsTest) => {
write!(f, "null pointer is not a valid pointer for this operation")
}
DanglingIntPointer(0, msg) => {
write!(f, "{}null pointer is not a valid pointer", msg)
}
DanglingIntPointer(i, msg) => {
write!(f, "{}0x{:x} is not a valid pointer", msg, i)
}