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security: harden application slot boundary validation #76

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Merged
srpatcha merged 1 commit into from
Sep 3, 2026
Merged

security: harden application slot boundary validation #76

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10 changes: 10 additions & 0 deletions stage1/jump_app.c
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,16 @@ int eboot_jump_to_app(eos_bootctl_t *bctl, eos_slot_t slot)
if (rc != EOS_OK)
return rc;

/* Defense-in-depth: ensure the image fits within the actual slot
* before any integrity verification can stream payload bytes. */
uint32_t slot_size = eos_hal_slot_size(slot);
if (slot_size == 0 ||
hdr.hdr_size > slot_size ||
hdr.image_size > slot_size - hdr.hdr_size) {
eos_boot_log_append(EOS_LOG_IMAGE_INVALID, slot, EOS_ERR_INVALID);
return EOS_ERR_INVALID;
}

/* Verify image integrity before jumping */
/* eos_image_verify_integrity() adds hdr_size internally — pass base addr only */
rc = eos_image_verify_integrity(&hdr, addr);
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