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* [PATCH v4] rtld: Add glibc.rtld.enable_secure tunable.
@ 2024-01-12 13:43 Joe Simmons-Talbott
  2024-01-12 13:53 ` H.J. Lu
  0 siblings, 1 reply; 3+ messages in thread
From: Joe Simmons-Talbott @ 2024-01-12 13:43 UTC (permalink / raw)
  To: libc-alpha; +Cc: Joe Simmons-Talbott

Add a tunable for setting __libc_enable_secure to 1.  Do not set
__libc_enable_secure to 0 if the tunable is set to 0.  Ignore all
tunables if glib.rtld.enable_secure is set.  One use-case for this
addition is to enable testing code paths that depend on
__libc_enable_secure being set without the need to use setxid binaries.
---
Changes to v3:
  * Rebase and fix merge conflict in NEWS.

Changes to v2:
  * handle the tunable in __tunables_init so that it's done in a single
    place.
  * ignore all tunables if the tunable is set.
  * update the testcase to only check the tunables if the enable_secure
    tunable is not set.
  * don't add tunables_strcmp as there is now already a version.

Changes to v1:
  * handle the tunable for the dynamic loader as well.

 NEWS                             |   5 ++
 elf/Makefile                     |   2 +
 elf/dl-tunables.c                |  11 +++
 elf/dl-tunables.list             |   6 ++
 elf/tst-rtld-list-tunables.exp   |   1 +
 elf/tst-tunables-enable_secure.c | 126 +++++++++++++++++++++++++++++++
 6 files changed, 151 insertions(+)
 create mode 100644 elf/tst-tunables-enable_secure.c

diff --git a/NEWS b/NEWS
index 83ae627f47..aff44f6d7f 100644
--- a/NEWS
+++ b/NEWS
@@ -55,6 +55,11 @@ Major new features:
   unsigned char, unsigned short, unsigned int, unsigned long int and
   unsigned long long int, and a type-generic macro.
 
+* A new tunable, glibc.rtld.enable_secure, used to run a program
+  as if it were a setuid process, enabling a number of security features. This
+  is currently a testing tool to allow more extensive verification tests for
+  AT_SECURE programs and not meant to be a security feature.
+
 Deprecated and removed features, and other changes affecting compatibility:
 
 * The ldconfig program now skips file names containing ';' or ending in
diff --git a/elf/Makefile b/elf/Makefile
index 5d78b659ce..45a6aa7a8d 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -285,6 +285,7 @@ tests-static-internal := \
   tst-tls1-static \
   tst-tls1-static-non-pie \
   tst-tunables \
+  tst-tunables-enable_secure \
   # tests-static-internal
 
 CRT-tst-tls1-static-non-pie := $(csu-objpfx)crt1.o
@@ -2676,6 +2677,7 @@ $(objpfx)tst-glibc-hwcaps-mask.out: \
 $(objpfx)tst-glibc-hwcaps-cache.out: $(objpfx)tst-glibc-hwcaps
 
 tst-tunables-ARGS = -- $(host-test-program-cmd)
+tst-tunables-enable_secure-ARGS = -- $(host-test-program-cmd)
 
 $(objpfx)list-tunables.out: tst-rtld-list-tunables.sh $(objpfx)ld.so
 	$(SHELL) $< $(objpfx)ld.so '$(test-wrapper-env)' \
diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c
index 03e1a68675..d3ccd2ecd4 100644
--- a/elf/dl-tunables.c
+++ b/elf/dl-tunables.c
@@ -223,6 +223,17 @@ parse_tunables_string (const char *valstring, struct tunable_toset_t *tunables)
 	    {
 	      tunables[ntunables++] =
 		(struct tunable_toset_t) { cur, value, p - value };
+
+	      /* Ignore tunables if enable_secure is set */
+	      if (tunable_is_name ("glibc.rtld.enable_secure", name))
+		{
+                  tunable_num_t val = (tunable_num_t) _dl_strtoul (value, NULL);
+		  if (val == 1)
+		    {
+		      __libc_enable_secure = 1;
+		      return 0;
+		    }
+		}
 	      break;
 	    }
 	}
diff --git a/elf/dl-tunables.list b/elf/dl-tunables.list
index 1b40407814..1186272c81 100644
--- a/elf/dl-tunables.list
+++ b/elf/dl-tunables.list
@@ -136,6 +136,12 @@ glibc {
       minval: 0
       default: 512
     }
+    enable_secure {
+      type: INT_32
+      minval: 0
+      maxval: 1
+      default: 0
+    }
   }
 
   mem {
diff --git a/elf/tst-rtld-list-tunables.exp b/elf/tst-rtld-list-tunables.exp
index 2233ea9c7c..db0e1c86e9 100644
--- a/elf/tst-rtld-list-tunables.exp
+++ b/elf/tst-rtld-list-tunables.exp
@@ -12,5 +12,6 @@ glibc.malloc.tcache_unsorted_limit: 0x0 (min: 0x0, max: 0x[f]+)
 glibc.malloc.top_pad: 0x20000 (min: 0x0, max: 0x[f]+)
 glibc.malloc.trim_threshold: 0x0 (min: 0x0, max: 0x[f]+)
 glibc.rtld.dynamic_sort: 2 (min: 1, max: 2)
+glibc.rtld.enable_secure: 0 (min: 0, max: 1)
 glibc.rtld.nns: 0x4 (min: 0x1, max: 0x10)
 glibc.rtld.optional_static_tls: 0x200 (min: 0x0, max: 0x[f]+)
diff --git a/elf/tst-tunables-enable_secure.c b/elf/tst-tunables-enable_secure.c
new file mode 100644
index 0000000000..790d14237e
--- /dev/null
+++ b/elf/tst-tunables-enable_secure.c
@@ -0,0 +1,126 @@
+/* Check GLIBC_TUNABLES parsing for enable_secure.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <array_length.h>
+#include <dl-tunables.h>
+#include <getopt.h>
+#include <intprops.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <support/capture_subprocess.h>
+#include <support/check.h>
+#include <sys/auxv.h>
+#include <unistd.h>
+
+static int restart;
+#define CMDLINE_OPTIONS \
+  { "restart", no_argument, &restart, 1 },
+
+static const struct test_t
+{
+  const char *env;
+  int32_t expected_malloc_check;
+  int32_t expected_enable_secure;
+} tests[] =
+{
+  /* Expected tunable format.  */
+  /* Tunables should be ignored if enable_secure is set. */
+  {
+    "glibc.malloc.check=2:glibc.rtld.enable_secure=1",
+    0,
+    1,
+  },
+  /* Tunables should be ignored if enable_secure is set. */
+  {
+    "glibc.rtld.enable_secure=1:glibc.malloc.check=2",
+    0,
+    1,
+  },
+  /* Tunables should be set if enable_secure is unset. */
+  {
+    "glibc.rtld.enable_secure=0:glibc.malloc.check=2",
+    2,
+    0,
+  },
+};
+
+static int
+handle_restart (int i)
+{
+  if (tests[i].expected_enable_secure == 1)
+    {
+      TEST_COMPARE (1, __libc_enable_secure);
+    }
+  else
+    {
+      TEST_COMPARE (tests[i].expected_malloc_check,
+		    TUNABLE_GET_FULL (glibc, malloc, check, int32_t, NULL));
+      TEST_COMPARE (tests[i].expected_enable_secure,
+		    TUNABLE_GET_FULL (glibc, rtld, enable_secure, int32_t,
+		    NULL));
+    }
+  return 0;
+}
+
+static int
+do_test (int argc, char *argv[])
+{
+  /* We must have either:
+     - One or four parameters left if called initially:
+       + path to ld.so         optional
+       + "--library-path"      optional
+       + the library path      optional
+       + the application name
+       + the test to check  */
+
+  TEST_VERIFY_EXIT (argc == 2 || argc == 5);
+
+  if (restart)
+    return handle_restart (atoi (argv[1]));
+
+  char nteststr[INT_BUFSIZE_BOUND (int)];
+
+  char *spargv[10];
+  {
+    int i = 0;
+    for (; i < argc - 1; i++)
+      spargv[i] = argv[i + 1];
+    spargv[i++] = (char *) "--direct";
+    spargv[i++] = (char *) "--restart";
+    spargv[i++] = nteststr;
+    spargv[i] = NULL;
+  }
+
+  for (int i = 0; i < array_length (tests); i++)
+    {
+      snprintf (nteststr, sizeof nteststr, "%d", i);
+
+      printf ("[%d] Spawned test for %s\n", i, tests[i].env);
+      setenv ("GLIBC_TUNABLES", tests[i].env, 1);
+      struct support_capture_subprocess result
+	= support_capture_subprogram (spargv[0], spargv);
+      support_capture_subprocess_check (&result, "tst-tunables-enable_secure",
+		                        0, sc_allow_stderr);
+      support_capture_subprocess_free (&result);
+    }
+
+  return 0;
+}
+
+#define TEST_FUNCTION_ARGV do_test
+#include <support/test-driver.c>
-- 
2.41.0


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v4] rtld: Add glibc.rtld.enable_secure tunable.
  2024-01-12 13:43 [PATCH v4] rtld: Add glibc.rtld.enable_secure tunable Joe Simmons-Talbott
@ 2024-01-12 13:53 ` H.J. Lu
  2024-01-12 18:25   ` Joe Simmons-Talbott
  0 siblings, 1 reply; 3+ messages in thread
From: H.J. Lu @ 2024-01-12 13:53 UTC (permalink / raw)
  To: Joe Simmons-Talbott; +Cc: libc-alpha

On Fri, Jan 12, 2024 at 5:44 AM Joe Simmons-Talbott <josimmon@redhat.com> wrote:
>
> Add a tunable for setting __libc_enable_secure to 1.  Do not set
> __libc_enable_secure to 0 if the tunable is set to 0.  Ignore all
> tunables if glib.rtld.enable_secure is set.  One use-case for this
> addition is to enable testing code paths that depend on
> __libc_enable_secure being set without the need to use setxid binaries.
> ---
> Changes to v3:
>   * Rebase and fix merge conflict in NEWS.
>
> Changes to v2:
>   * handle the tunable in __tunables_init so that it's done in a single
>     place.
>   * ignore all tunables if the tunable is set.
>   * update the testcase to only check the tunables if the enable_secure
>     tunable is not set.
>   * don't add tunables_strcmp as there is now already a version.
>
> Changes to v1:
>   * handle the tunable for the dynamic loader as well.
>
>  NEWS                             |   5 ++
>  elf/Makefile                     |   2 +
>  elf/dl-tunables.c                |  11 +++
>  elf/dl-tunables.list             |   6 ++
>  elf/tst-rtld-list-tunables.exp   |   1 +
>  elf/tst-tunables-enable_secure.c | 126 +++++++++++++++++++++++++++++++
>  6 files changed, 151 insertions(+)
>  create mode 100644 elf/tst-tunables-enable_secure.c
>
> diff --git a/NEWS b/NEWS
> index 83ae627f47..aff44f6d7f 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -55,6 +55,11 @@ Major new features:
>    unsigned char, unsigned short, unsigned int, unsigned long int and
>    unsigned long long int, and a type-generic macro.
>
> +* A new tunable, glibc.rtld.enable_secure, used to run a program
> +  as if it were a setuid process, enabling a number of security features. This
> +  is currently a testing tool to allow more extensive verification tests for
> +  AT_SECURE programs and not meant to be a security feature.
> +
>  Deprecated and removed features, and other changes affecting compatibility:
>
>  * The ldconfig program now skips file names containing ';' or ending in
> diff --git a/elf/Makefile b/elf/Makefile
> index 5d78b659ce..45a6aa7a8d 100644
> --- a/elf/Makefile
> +++ b/elf/Makefile
> @@ -285,6 +285,7 @@ tests-static-internal := \
>    tst-tls1-static \
>    tst-tls1-static-non-pie \
>    tst-tunables \
> +  tst-tunables-enable_secure \
>    # tests-static-internal
>
>  CRT-tst-tls1-static-non-pie := $(csu-objpfx)crt1.o
> @@ -2676,6 +2677,7 @@ $(objpfx)tst-glibc-hwcaps-mask.out: \
>  $(objpfx)tst-glibc-hwcaps-cache.out: $(objpfx)tst-glibc-hwcaps
>
>  tst-tunables-ARGS = -- $(host-test-program-cmd)
> +tst-tunables-enable_secure-ARGS = -- $(host-test-program-cmd)
>
>  $(objpfx)list-tunables.out: tst-rtld-list-tunables.sh $(objpfx)ld.so
>         $(SHELL) $< $(objpfx)ld.so '$(test-wrapper-env)' \
> diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c
> index 03e1a68675..d3ccd2ecd4 100644
> --- a/elf/dl-tunables.c
> +++ b/elf/dl-tunables.c
> @@ -223,6 +223,17 @@ parse_tunables_string (const char *valstring, struct tunable_toset_t *tunables)
>             {
>               tunables[ntunables++] =
>                 (struct tunable_toset_t) { cur, value, p - value };
> +
> +             /* Ignore tunables if enable_secure is set */
> +             if (tunable_is_name ("glibc.rtld.enable_secure", name))
> +               {
> +                  tunable_num_t val = (tunable_num_t) _dl_strtoul (value, NULL);
> +                 if (val == 1)
> +                   {
> +                     __libc_enable_secure = 1;
> +                     return 0;
> +                   }
> +               }
>               break;
>             }
>         }
> diff --git a/elf/dl-tunables.list b/elf/dl-tunables.list
> index 1b40407814..1186272c81 100644
> --- a/elf/dl-tunables.list
> +++ b/elf/dl-tunables.list
> @@ -136,6 +136,12 @@ glibc {
>        minval: 0
>        default: 512
>      }
> +    enable_secure {
> +      type: INT_32
> +      minval: 0
> +      maxval: 1
> +      default: 0
> +    }
>    }
>
>    mem {
> diff --git a/elf/tst-rtld-list-tunables.exp b/elf/tst-rtld-list-tunables.exp
> index 2233ea9c7c..db0e1c86e9 100644
> --- a/elf/tst-rtld-list-tunables.exp
> +++ b/elf/tst-rtld-list-tunables.exp
> @@ -12,5 +12,6 @@ glibc.malloc.tcache_unsorted_limit: 0x0 (min: 0x0, max: 0x[f]+)
>  glibc.malloc.top_pad: 0x20000 (min: 0x0, max: 0x[f]+)
>  glibc.malloc.trim_threshold: 0x0 (min: 0x0, max: 0x[f]+)
>  glibc.rtld.dynamic_sort: 2 (min: 1, max: 2)
> +glibc.rtld.enable_secure: 0 (min: 0, max: 1)
>  glibc.rtld.nns: 0x4 (min: 0x1, max: 0x10)
>  glibc.rtld.optional_static_tls: 0x200 (min: 0x0, max: 0x[f]+)
> diff --git a/elf/tst-tunables-enable_secure.c b/elf/tst-tunables-enable_secure.c
> new file mode 100644
> index 0000000000..790d14237e
> --- /dev/null
> +++ b/elf/tst-tunables-enable_secure.c
> @@ -0,0 +1,126 @@
> +/* Check GLIBC_TUNABLES parsing for enable_secure.
> +   Copyright (C) 2023 Free Software Foundation, Inc.

2024

> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <https://www.gnu.org/licenses/>.  */
> +
> +#include <array_length.h>
> +#include <dl-tunables.h>
> +#include <getopt.h>
> +#include <intprops.h>
> +#include <stdint.h>
> +#include <stdlib.h>
> +#include <support/capture_subprocess.h>
> +#include <support/check.h>
> +#include <sys/auxv.h>
> +#include <unistd.h>
> +
> +static int restart;
> +#define CMDLINE_OPTIONS \
> +  { "restart", no_argument, &restart, 1 },
> +
> +static const struct test_t
> +{
> +  const char *env;
> +  int32_t expected_malloc_check;
> +  int32_t expected_enable_secure;
> +} tests[] =
> +{
> +  /* Expected tunable format.  */
> +  /* Tunables should be ignored if enable_secure is set. */
> +  {
> +    "glibc.malloc.check=2:glibc.rtld.enable_secure=1",
> +    0,
> +    1,
> +  },
> +  /* Tunables should be ignored if enable_secure is set. */
> +  {
> +    "glibc.rtld.enable_secure=1:glibc.malloc.check=2",
> +    0,
> +    1,
> +  },
> +  /* Tunables should be set if enable_secure is unset. */
> +  {
> +    "glibc.rtld.enable_secure=0:glibc.malloc.check=2",
> +    2,
> +    0,
> +  },
> +};
> +
> +static int
> +handle_restart (int i)
> +{
> +  if (tests[i].expected_enable_secure == 1)
> +    {
> +      TEST_COMPARE (1, __libc_enable_secure);
> +    }
> +  else
> +    {
> +      TEST_COMPARE (tests[i].expected_malloc_check,
> +                   TUNABLE_GET_FULL (glibc, malloc, check, int32_t, NULL));
> +      TEST_COMPARE (tests[i].expected_enable_secure,
> +                   TUNABLE_GET_FULL (glibc, rtld, enable_secure, int32_t,
> +                   NULL));
> +    }
> +  return 0;
> +}
> +
> +static int
> +do_test (int argc, char *argv[])
> +{
> +  /* We must have either:
> +     - One or four parameters left if called initially:
> +       + path to ld.so         optional
> +       + "--library-path"      optional
> +       + the library path      optional
> +       + the application name
> +       + the test to check  */
> +
> +  TEST_VERIFY_EXIT (argc == 2 || argc == 5);
> +
> +  if (restart)
> +    return handle_restart (atoi (argv[1]));
> +
> +  char nteststr[INT_BUFSIZE_BOUND (int)];
> +
> +  char *spargv[10];
> +  {
> +    int i = 0;
> +    for (; i < argc - 1; i++)
> +      spargv[i] = argv[i + 1];
> +    spargv[i++] = (char *) "--direct";
> +    spargv[i++] = (char *) "--restart";
> +    spargv[i++] = nteststr;
> +    spargv[i] = NULL;
> +  }
> +
> +  for (int i = 0; i < array_length (tests); i++)
> +    {
> +      snprintf (nteststr, sizeof nteststr, "%d", i);
> +
> +      printf ("[%d] Spawned test for %s\n", i, tests[i].env);
> +      setenv ("GLIBC_TUNABLES", tests[i].env, 1);
> +      struct support_capture_subprocess result
> +       = support_capture_subprogram (spargv[0], spargv);
> +      support_capture_subprocess_check (&result, "tst-tunables-enable_secure",
> +                                       0, sc_allow_stderr);
> +      support_capture_subprocess_free (&result);
> +    }
> +
> +  return 0;
> +}
> +
> +#define TEST_FUNCTION_ARGV do_test
> +#include <support/test-driver.c>
> --
> 2.41.0
>


-- 
H.J.

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v4] rtld: Add glibc.rtld.enable_secure tunable.
  2024-01-12 13:53 ` H.J. Lu
@ 2024-01-12 18:25   ` Joe Simmons-Talbott
  0 siblings, 0 replies; 3+ messages in thread
From: Joe Simmons-Talbott @ 2024-01-12 18:25 UTC (permalink / raw)
  To: H.J. Lu; +Cc: libc-alpha

On Fri, Jan 12, 2024 at 05:53:23AM -0800, H.J. Lu wrote:
> On Fri, Jan 12, 2024 at 5:44 AM Joe Simmons-Talbott <josimmon@redhat.com> wrote:
> >
> > Add a tunable for setting __libc_enable_secure to 1.  Do not set
> > __libc_enable_secure to 0 if the tunable is set to 0.  Ignore all
> > tunables if glib.rtld.enable_secure is set.  One use-case for this
> > addition is to enable testing code paths that depend on
> > __libc_enable_secure being set without the need to use setxid binaries.
> > ---
> > Changes to v3:
> >   * Rebase and fix merge conflict in NEWS.
> >
> > Changes to v2:
> >   * handle the tunable in __tunables_init so that it's done in a single
> >     place.
> >   * ignore all tunables if the tunable is set.
> >   * update the testcase to only check the tunables if the enable_secure
> >     tunable is not set.
> >   * don't add tunables_strcmp as there is now already a version.
> >
> > Changes to v1:
> >   * handle the tunable for the dynamic loader as well.
> >
> >  NEWS                             |   5 ++
> >  elf/Makefile                     |   2 +
> >  elf/dl-tunables.c                |  11 +++
> >  elf/dl-tunables.list             |   6 ++
> >  elf/tst-rtld-list-tunables.exp   |   1 +
> >  elf/tst-tunables-enable_secure.c | 126 +++++++++++++++++++++++++++++++
> >  6 files changed, 151 insertions(+)
> >  create mode 100644 elf/tst-tunables-enable_secure.c
> >
> > diff --git a/NEWS b/NEWS
> > index 83ae627f47..aff44f6d7f 100644
> > --- a/NEWS
> > +++ b/NEWS
> > @@ -55,6 +55,11 @@ Major new features:
> >    unsigned char, unsigned short, unsigned int, unsigned long int and
> >    unsigned long long int, and a type-generic macro.
> >
> > +* A new tunable, glibc.rtld.enable_secure, used to run a program
> > +  as if it were a setuid process, enabling a number of security features. This
> > +  is currently a testing tool to allow more extensive verification tests for
> > +  AT_SECURE programs and not meant to be a security feature.
> > +
> >  Deprecated and removed features, and other changes affecting compatibility:
> >
> >  * The ldconfig program now skips file names containing ';' or ending in
> > diff --git a/elf/Makefile b/elf/Makefile
> > index 5d78b659ce..45a6aa7a8d 100644
> > --- a/elf/Makefile
> > +++ b/elf/Makefile
> > @@ -285,6 +285,7 @@ tests-static-internal := \
> >    tst-tls1-static \
> >    tst-tls1-static-non-pie \
> >    tst-tunables \
> > +  tst-tunables-enable_secure \
> >    # tests-static-internal
> >
> >  CRT-tst-tls1-static-non-pie := $(csu-objpfx)crt1.o
> > @@ -2676,6 +2677,7 @@ $(objpfx)tst-glibc-hwcaps-mask.out: \
> >  $(objpfx)tst-glibc-hwcaps-cache.out: $(objpfx)tst-glibc-hwcaps
> >
> >  tst-tunables-ARGS = -- $(host-test-program-cmd)
> > +tst-tunables-enable_secure-ARGS = -- $(host-test-program-cmd)
> >
> >  $(objpfx)list-tunables.out: tst-rtld-list-tunables.sh $(objpfx)ld.so
> >         $(SHELL) $< $(objpfx)ld.so '$(test-wrapper-env)' \
> > diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c
> > index 03e1a68675..d3ccd2ecd4 100644
> > --- a/elf/dl-tunables.c
> > +++ b/elf/dl-tunables.c
> > @@ -223,6 +223,17 @@ parse_tunables_string (const char *valstring, struct tunable_toset_t *tunables)
> >             {
> >               tunables[ntunables++] =
> >                 (struct tunable_toset_t) { cur, value, p - value };
> > +
> > +             /* Ignore tunables if enable_secure is set */
> > +             if (tunable_is_name ("glibc.rtld.enable_secure", name))
> > +               {
> > +                  tunable_num_t val = (tunable_num_t) _dl_strtoul (value, NULL);
> > +                 if (val == 1)
> > +                   {
> > +                     __libc_enable_secure = 1;
> > +                     return 0;
> > +                   }
> > +               }
> >               break;
> >             }
> >         }
> > diff --git a/elf/dl-tunables.list b/elf/dl-tunables.list
> > index 1b40407814..1186272c81 100644
> > --- a/elf/dl-tunables.list
> > +++ b/elf/dl-tunables.list
> > @@ -136,6 +136,12 @@ glibc {
> >        minval: 0
> >        default: 512
> >      }
> > +    enable_secure {
> > +      type: INT_32
> > +      minval: 0
> > +      maxval: 1
> > +      default: 0
> > +    }
> >    }
> >
> >    mem {
> > diff --git a/elf/tst-rtld-list-tunables.exp b/elf/tst-rtld-list-tunables.exp
> > index 2233ea9c7c..db0e1c86e9 100644
> > --- a/elf/tst-rtld-list-tunables.exp
> > +++ b/elf/tst-rtld-list-tunables.exp
> > @@ -12,5 +12,6 @@ glibc.malloc.tcache_unsorted_limit: 0x0 (min: 0x0, max: 0x[f]+)
> >  glibc.malloc.top_pad: 0x20000 (min: 0x0, max: 0x[f]+)
> >  glibc.malloc.trim_threshold: 0x0 (min: 0x0, max: 0x[f]+)
> >  glibc.rtld.dynamic_sort: 2 (min: 1, max: 2)
> > +glibc.rtld.enable_secure: 0 (min: 0, max: 1)
> >  glibc.rtld.nns: 0x4 (min: 0x1, max: 0x10)
> >  glibc.rtld.optional_static_tls: 0x200 (min: 0x0, max: 0x[f]+)
> > diff --git a/elf/tst-tunables-enable_secure.c b/elf/tst-tunables-enable_secure.c
> > new file mode 100644
> > index 0000000000..790d14237e
> > --- /dev/null
> > +++ b/elf/tst-tunables-enable_secure.c
> > @@ -0,0 +1,126 @@
> > +/* Check GLIBC_TUNABLES parsing for enable_secure.
> > +   Copyright (C) 2023 Free Software Foundation, Inc.
> 
> 2024
> 

Thanks for catching that.  Updated in v5.

Thanks,
Joe


^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2024-01-12 18:25 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-01-12 13:43 [PATCH v4] rtld: Add glibc.rtld.enable_secure tunable Joe Simmons-Talbott
2024-01-12 13:53 ` H.J. Lu
2024-01-12 18:25   ` Joe Simmons-Talbott

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