setarch: flush output streams before exec

This fixes the following (non-deterministic) discrepancy:

$ setarch x86_64 -RFZLvXBIST3 --uname-2.6 echo success
Switching on READ_IMPLIES_EXEC.
Switching on ADDR_LIMIT_32BIT.
Switching on SHORT_INODE.
Switching on WHOLE_SECONDS.
Switching on STICKY_TIMEOUTS.
Switching on ADDR_LIMIT_3GB.
Switching on UNAME26.
success

$ setarch x86_64 -RFZLvXBIST3 --uname-2.6 echo success  &> /tmp/bla; cat /tmp/bla
success

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>

diff --git a/sys-utils/setarch.c b/sys-utils/setarch.c
index 957bb2b0308acbb3f4b8f515593aedccebc3ac1f..f957c7975870e110526b5f39dbcfa4f95ac4acc5 100644 (file)
--- a/sys-utils/setarch.c
+++ b/sys-utils/setarch.c
@@ -356,6 +356,9 @@ int main(int argc, char *argv[])
   if (set_arch(p, options, 0))
     err(EXIT_FAILURE, _("Failed to set personality to %s"), p);
 
+  /* flush all output streams before exec */
+  fflush(NULL);
+
   if (!argc) {
     execl("/bin/sh", "-sh", NULL);
     err(EXIT_FAILURE, _("failed to execute %s"), "/bin/sh");

diff --git a/tests/expected/misc/setarch b/tests/expected/misc/setarch
index 2e9ba477f89e86c5bbc86c0516283f59d8f6e178..54208acf65dcf900f644d370885ee7a08854ab82 100644 (file)
--- a/tests/expected/misc/setarch
+++ b/tests/expected/misc/setarch
@@ -1 +1,12 @@
+Switching on ADDR_NO_RANDOMIZE.
+Switching on FDPIC_FUNCPTRS.
+Switching on MMAP_PAGE_ZERO.
+Switching on ADDR_COMPAT_LAYOUT.
+Switching on READ_IMPLIES_EXEC.
+Switching on ADDR_LIMIT_32BIT.
+Switching on SHORT_INODE.
+Switching on WHOLE_SECONDS.
+Switching on STICKY_TIMEOUTS.
+Switching on ADDR_LIMIT_3GB.
+Switching on UNAME26.
 success