On 2023/4/18 22:06, Weiwei Li wrote:
When PMP entry overlap part of the page, we'll set the tlb_size to 1, which
will make the address in tlb entry set with TLB_INVALID_MASK, and the next
access will again go through tlb_fill.However, this way will not work in
tb_gen_code() => get_page_addr_code_hostp(): the TLB host address will be
cached, and the following instructions can use this host address directly
which may lead to the bypass of PMP related check.
We can add a link to the issue in the commit message,
https://gitlab.com/qemu-project/qemu/-/issues/1542
Reviewed-by: LIU Zhiwei <zhiwei_...@linux.alibaba.com>
Zhiwei
Signed-off-by: Weiwei Li <liwei...@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqi...@iscas.ac.cn>
---
accel/tcg/cputlb.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
index e984a98dc4..efa0cb67c9 100644
--- a/accel/tcg/cputlb.c
+++ b/accel/tcg/cputlb.c
@@ -1696,6 +1696,11 @@ tb_page_addr_t get_page_addr_code_hostp(CPUArchState
*env, target_ulong addr,
if (p == NULL) {
return -1;
}
+
+ if (full->lg_page_size < TARGET_PAGE_BITS) {
+ return -1;
+ }
+
if (hostp) {
*hostp = p;
}
