[PULL,03/15] linux-user: Diagnose misaligned -R size

Commit Message

Richard Henderson March 28, 2023, 10:57 p.m. UTC

We have been enforcing host page alignment for the non-R
fallback of MAX_RESERVED_VA, but failing to enforce for -R.

Reviewed-by: Philippe Mathieu-Daudé <[e-mail]>
Signed-off-by: Richard Henderson <[e-mail]>
---
 linux-user/main.c | 6 ++++++
 1 file changed, 6 insertions(+)

Patch

diff --git a/linux-user/main.c b/linux-user/main.c
index 4b18461969..39d9bd4d7a 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -793,6 +793,12 @@  int main(int argc, char **argv, char **envp)
      */
     max_reserved_va = MAX_RESERVED_VA(cpu);
     if (reserved_va != 0) {
+        if (reserved_va % qemu_host_page_size) {
+            char *s = size_to_str(qemu_host_page_size);
+            fprintf(stderr, "Reserved virtual address not aligned mod %s\n", s);
+            g_free(s);
+            exit(EXIT_FAILURE);
+        }
         if (max_reserved_va && reserved_va > max_reserved_va) {
             fprintf(stderr, "Reserved virtual address too big\n");
             exit(EXIT_FAILURE);