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* [glibc] Fix elf/tst-env-setuid[-static] if test needs to be rerun.
@ 2023-12-20 7:41 Stefan Liebler
0 siblings, 0 replies; only message in thread
From: Stefan Liebler @ 2023-12-20 7:41 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3150cc0c9019bf9da841419f86dda8e7f26d676d
commit 3150cc0c9019bf9da841419f86dda8e7f26d676d
Author: Stefan Liebler <stli@linux.ibm.com>
Date: Wed Dec 13 12:44:50 2023 +0100
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>
Diff:
---
elf/Makefile | 1 +
elf/tst-env-setuid-static.c | 1 +
elf/tst-env-setuid.c | 46 +++++++++++++++++++++++++++++++++++++++------
3 files changed, 42 insertions(+), 6 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
diff --git a/elf/tst-env-setuid-static.c b/elf/tst-env-setuid-static.c
index 0d88ae88b9..162d9169ec 100644
--- a/elf/tst-env-setuid-static.c
+++ b/elf/tst-env-setuid-static.c
@@ -1 +1,2 @@
+#define PROFILE_LIB "tst-sonamemove-runmod1.so"
#include "tst-env-setuid.c"
diff --git a/elf/tst-env-setuid.c b/elf/tst-env-setuid.c
index 9fa591a136..b4f0e547a7 100644
--- a/elf/tst-env-setuid.c
+++ b/elf/tst-env-setuid.c
@@ -36,7 +36,9 @@ static char SETGID_CHILD[] = "setgid-child";
#define UNFILTERED_VALUE "some-unfiltered-value"
/* It assumes no other programs is being profile with a library with same
SONAME using the default folder. */
-#define PROFILE_LIB "tst-sonamemove-runmod2.so"
+#ifndef PROFILE_LIB
+# define PROFILE_LIB "tst-sonamemove-runmod2.so"
+#endif
struct envvar_t
{
@@ -53,7 +55,7 @@ static const struct envvar_t filtered_envvars[] =
{ "LD_HWCAP_MASK", FILTERED_VALUE },
{ "LD_LIBRARY_PATH", FILTERED_VALUE },
{ "LD_PRELOAD", FILTERED_VALUE },
- { "LD_PROFILE", "tst-sonamemove-runmod2.so" },
+ { "LD_PROFILE", PROFILE_LIB },
{ "MALLOC_ARENA_MAX", FILTERED_VALUE },
{ "MALLOC_PERTURB_", FILTERED_VALUE },
{ "MALLOC_TRACE", FILTERED_VALUE },
@@ -83,7 +85,12 @@ test_child (void)
e++)
{
const char *env = getenv (e->env);
- ret |= env != NULL;
+ if (env != NULL)
+ {
+ printf ("FAIL: filtered environment variable is not NULL: %s=%s\n",
+ e->env, env);
+ ret = 1;
+ }
}
for (const struct envvar_t *e = unfiltered_envvars;
@@ -91,13 +98,30 @@ test_child (void)
e++)
{
const char *env = getenv (e->env);
- ret |= !(env != NULL && strcmp (env, e->value) == 0);
+ if (!(env != NULL && strcmp (env, e->value) == 0))
+ {
+ if (env == NULL)
+ printf ("FAIL: unfiltered environment variable %s is NULL\n",
+ e->env);
+ else
+ printf ("FAIL: unfiltered environment variable %s=%s != %s\n",
+ e->env, env, e->value);
+
+ ret = 1;
+ }
}
- /* Also check if no profile file was created. */
+ /* Also check if no profile file was created.
+ The parent sets LD_DEBUG_OUTPUT="/tmp/some-file"
+ which should be filtered. Then it falls back to "/var/tmp".
+ Note: LD_PROFILE is not supported for static binaries. */
{
char *profilepath = xasprintf ("/var/tmp/%s.profile", PROFILE_LIB);
- ret |= !access (profilepath, R_OK);
+ if (!access (profilepath, R_OK))
+ {
+ printf ("FAIL: LD_PROFILE file at %s was created!\n", profilepath);
+ ret = 1;
+ }
free (profilepath);
}
@@ -141,6 +165,16 @@ do_test (int argc, char **argv)
e++)
setenv (e->env, e->value, 1);
+ /* Ensure that the profile output does not exist from a previous run
+ (e.g. if test_dir, which defaults to /tmp, is mounted nosuid.)
+ Note: support_capture_subprogram_self_sgid creates the SGID binary
+ in test_dir. */
+ {
+ char *profilepath = xasprintf ("/var/tmp/%s.profile", PROFILE_LIB);
+ unlink (profilepath);
+ free (profilepath);
+ }
+
int status = support_capture_subprogram_self_sgid (SETGID_CHILD);
if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
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