Fix elf/tst-env-setuid[-static] if test needs to be rerun.

If /tmp is mounted nosuid and make xcheck is run,
then tst-env-setuid fails UNSUPPORTED with "SGID failed: GID and EGID match"
and /var/tmp/tst-sonamemove-runmod1.so.profile is created.

If you then try to rerun the test with a suid mounted test-dir
(the SGID binary is created in test-dir which defaults to /tmp)
with something like that:
make tst-env-setuid-ENV="TMPDIR=..." t=elf/tst-env-setuid test
the test fails as the LD_PROFILE output file is still available
from the previous run.

Thus this patch removes the LD_PROFILE output file in parent
before spawning the SGID binary.

Even if LD_PROFILE is not supported anymore in static binaries,
use a different library and thus output file for tst-env-setuid
and tst-env-setuid-static in order to not interfere if both
tests are run in parallel.

Furthermore the checks in test_child are now more verbose.
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/elf/Makefile b/elf/Makefile
index afec7be084..87aac923ba 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -3015,6 +3015,7 @@ tst-env-setuid-ARGS = -- $(host-test-program-cmd)
 
 # Reuse a module with a SONAME, to specific as the LD_PROFILE.
 $(objpfx)tst-env-setuid: $(objpfx)tst-sonamemove-runmod2.so
+$(objpfx)tst-env-setuid-static.out: $(objpfx)tst-sonamemove-runmod1.so
 
 # The object tst-nodeps1-mod.so has no explicit dependencies on libc.so.
 $(objpfx)tst-nodeps1-mod.so: $(objpfx)tst-nodeps1-mod.os