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[v2,04/10] linux-user: more debug for init_guest_space

Message ID 20200401094759.5835-5-alex.bennee@linaro.org
State New
Headers show
Series A selection of sanitiser fixes | expand

Commit Message

Alex Bennée April 1, 2020, 9:47 a.m. UTC 
Searching for memory space can cause problems so lets extend the
CPU_LOG_PAGE output so you can watch init_guest_space fail to
allocate memory. A more involved fix is actually required to make this
function play nicely with the large guard pages the sanitiser likes to
use.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
---
 linux-user/elfload.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 8198be04460..619c054cc48 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -2172,6 +2172,8 @@  unsigned long init_guest_space(unsigned long host_start,
 
         /* Check to see if the address is valid.  */
         if (host_start && real_start != current_start) {
+            qemu_log_mask(CPU_LOG_PAGE, "invalid %lx && %lx != %lx\n",
+                          host_start, real_start, current_start);
             goto try_again;
         }
 
@@ -2240,7 +2242,11 @@  unsigned long init_guest_space(unsigned long host_start,
          * probably a bad strategy if not, which means we got here
          * because of trouble with ARM commpage setup.
          */
-        munmap((void *)real_start, real_size);
+        if (munmap((void *)real_start, real_size) != 0) {
+            error_report("%s: failed to unmap %lx:%lx (%s)", __func__,
+                         real_start, real_size, strerror(errno));
+            abort();
+        }
         current_start += align;
         if (host_start == current_start) {
             /* Theoretically possible if host doesn't have any suitably