After mprotect(addr, PROT_NONE), addr can still be executed if there
are cached translations. Drop them.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
accel/tcg/translate-all.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index ef62a199c7..9318ada6b9 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -2295,12 +2295,19 @@ void page_set_flags(target_ulong start, target_ulong
end, int flags)
len != 0;
len -= TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) {
PageDesc *p = page_find_alloc(addr >> TARGET_PAGE_BITS, 1);
+ bool write_set, read_cleared;
- /* If the write protection bit is set, then we invalidate
- the code inside. */
- if (!(p->flags & PAGE_WRITE) &&
- (flags & PAGE_WRITE) &&
- p->first_tb) {
+ /*
+ * If the write protection bit is set, then we invalidate the code
+ * inside.
+ */
+ write_set = !(p->flags & PAGE_WRITE) && (flags & PAGE_WRITE);
+ /*
+ * If PAGE_READ is cleared, we also need to invalidate the code in
+ * order to force a fault when trying to run it.
+ */
+ read_cleared = (p->flags & PAGE_READ) && !(flags & PAGE_READ);