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Take into account size of revert index

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Fixes a bug in the partition assertions that ensures that the state
page(s) have enough space for 2x active partition range.

Add unit test to verify that panic is observed.
This commit is contained in:
Ulf Lilleengen 2022-09-20 14:03:04 +02:00
parent 11da25800b
commit b418c0e4d6
1 changed files with 17 additions and 4 deletions
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21
embassy-boot/boot/src/lib.rs
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@ -222,10 +222,7 @@ impl BootLoader {
page: &mut [u8],
) -> Result<State, BootError> {
// Ensure we have enough progress pages to store copy progress
assert_eq!(self.active.len() % page.len(), 0);
assert_eq!(self.dfu.len() % page.len(), 0);
assert!(self.dfu.len() - self.active.len() >= page.len());
assert!(self.active.len() / page.len() <= (self.state.len() - P::STATE::WRITE_SIZE) / P::STATE::WRITE_SIZE);
assert_partitions(self.active, self.dfu, self.state, page.len(), P::STATE::WRITE_SIZE);
assert_eq!(magic.len(), P::STATE::WRITE_SIZE);
// Copy contents from partition N to active
@ -409,6 +406,13 @@ impl BootLoader {
}
}
fn assert_partitions(active: Partition, dfu: Partition, state: Partition, page_size: usize, write_size: usize) {
assert_eq!(active.len() % page_size, 0);
assert_eq!(dfu.len() % page_size, 0);
assert!(dfu.len() - active.len() >= page_size);
assert!(2 * (active.len() / page_size) <= (state.len() - write_size) / write_size);
}
/// Convenience provider that uses a single flash for all partitions.
pub struct SingleFlashConfig<'a, F>
where
@ -919,6 +923,15 @@ mod tests {
}
}
#[test]
#[should_panic]
fn test_range_asserts() {
const ACTIVE: Partition = Partition::new(4096, 4194304);
const DFU: Partition = Partition::new(4194304, 2 * 4194304);
const STATE: Partition = Partition::new(0, 4096);
assert_partitions(ACTIVE, DFU, STATE, 4096, 4);
}
struct MemFlash<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize>([u8; SIZE]);
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> NorFlash