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elf/rtld: Count skipped environment variables for enable_secure
When using the glibc.rtld.enable_secure tunable we need to keep track of the count of environment variables we skip due to __libc_enable_secure being set and adjust the auxv section of the stack. This fixes an assertion when running ld.so directly with glibc.rtld.enable_secure set. Add a testcase that ensures the assert is not hit. elf/rtld.c:1324 assert (auxv == sp + 1); Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Joe Simmons-Talbott
parent
14e56bd4ce
commit
59974938fe
10
elf/Makefile
10
elf/Makefile
@ -315,6 +315,7 @@ tests := \
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tst-leaks1 \
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tst-stringtable \
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tst-tls9 \
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tst-tunables-enable_secure-env \
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# tests
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tests-internal := \
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@ -1188,6 +1189,7 @@ tests-special += \
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$(objpfx)tst-trace3.out \
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$(objpfx)tst-trace4.out \
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$(objpfx)tst-trace5.out \
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$(objpfx)tst-tunables-enable_secure-env.out \
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$(objpfx)tst-unused-dep-cmp.out \
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$(objpfx)tst-unused-dep.out \
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# tests-special
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@ -2215,6 +2217,14 @@ $(objpfx)tst-unused-dep-cmp.out: $(objpfx)tst-unused-dep.out
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cmp $< /dev/null > $@; \
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$(evaluate-test)
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$(objpfx)tst-tunables-enable_secure-env.out: $(objpfx)tst-tunables-enable_secure-env
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$(test-wrapper-env) \
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GLIBC_TUNABLES=glibc.rtld.enable_secure=1 \
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$(rtld-prefix) \
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$< > $@; \
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$(evaluate-test)
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$(objpfx)tst-audit11.out: $(objpfx)tst-auditmod11.so $(objpfx)tst-audit11mod1.so
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tst-audit11-ENV = LD_AUDIT=$(objpfx)tst-auditmod11.so
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$(objpfx)tst-audit11mod1.so: $(objpfx)tst-audit11mod2.so
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31
elf/rtld.c
31
elf/rtld.c
@ -155,7 +155,7 @@ static void dl_main_state_init (struct dl_main_state *state);
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Since all of them start with `LD_' we are a bit smarter while finding
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all the entries. */
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extern char **_environ attribute_hidden;
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static void process_envvars (struct dl_main_state *state);
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static int process_envvars (struct dl_main_state *state);
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int _dl_argc attribute_relro attribute_hidden;
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char **_dl_argv attribute_relro = NULL;
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@ -1289,7 +1289,7 @@ rtld_setup_main_map (struct link_map *main_map)
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_dl_argv and _dl_argc accordingly. Those arguments are removed from
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argv here. */
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static void
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_dl_start_args_adjust (int skip_args)
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_dl_start_args_adjust (int skip_args, int skip_env)
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{
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void **sp = (void **) (_dl_argv - skip_args - 1);
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void **p = sp + skip_args;
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@ -1321,7 +1321,7 @@ _dl_start_args_adjust (int skip_args)
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while (*p != NULL);
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#ifdef HAVE_AUX_VECTOR
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void **auxv = (void **) GLRO(dl_auxv) - skip_args;
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void **auxv = (void **) GLRO(dl_auxv) - skip_args - skip_env;
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GLRO(dl_auxv) = (ElfW(auxv_t) *) auxv; /* Aliasing violation. */
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assert (auxv == sp + 1);
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@ -1352,6 +1352,7 @@ dl_main (const ElfW(Phdr) *phdr,
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unsigned int i;
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bool rtld_is_main = false;
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void *tcbp = NULL;
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int skip_env = 0;
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struct dl_main_state state;
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dl_main_state_init (&state);
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@ -1365,7 +1366,7 @@ dl_main (const ElfW(Phdr) *phdr,
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#endif
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/* Process the environment variable which control the behaviour. */
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process_envvars (&state);
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skip_env = process_envvars (&state);
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#ifndef HAVE_INLINED_SYSCALLS
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/* Set up a flag which tells we are just starting. */
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@ -1630,7 +1631,7 @@ dl_main (const ElfW(Phdr) *phdr,
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_dl_argv[0] = argv0;
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/* Adjust arguments for the application entry point. */
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_dl_start_args_adjust (_dl_argv - orig_argv);
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_dl_start_args_adjust (_dl_argv - orig_argv, skip_env);
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}
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else
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{
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@ -2534,11 +2535,12 @@ a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n");
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}
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}
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static void
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static int
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process_envvars_secure (struct dl_main_state *state)
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{
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char **runp = _environ;
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char *envline;
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int skip_env = 0;
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while ((envline = _dl_next_ld_env_entry (&runp)) != NULL)
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{
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@ -2580,6 +2582,14 @@ process_envvars_secure (struct dl_main_state *state)
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const char *nextp = UNSECURE_ENVVARS;
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do
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{
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/* Keep track of the number of environment variables that were set in
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the environment and are unset below. Use getenv() which returns
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non-NULL if the variable is set in the environment. This count is
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needed if we need to adjust the location of the AUX vector on the
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stack when running ld.so directly. */
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if (getenv (nextp) != NULL)
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skip_env++;
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unsetenv (nextp);
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nextp = strchr (nextp, '\0') + 1;
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}
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@ -2592,6 +2602,8 @@ process_envvars_secure (struct dl_main_state *state)
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|| state->mode != rtld_mode_normal
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|| state->version_info)
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_exit (5);
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return skip_env;
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}
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static void
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@ -2745,13 +2757,16 @@ process_envvars_default (struct dl_main_state *state)
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}
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}
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static void
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static int
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process_envvars (struct dl_main_state *state)
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{
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int skip_env = 0;
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if (__glibc_unlikely (__libc_enable_secure))
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process_envvars_secure (state);
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skip_env += process_envvars_secure (state);
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else
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process_envvars_default (state);
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return skip_env;
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}
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#if HP_TIMING_INLINE
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33
elf/tst-tunables-enable_secure-env.c
Normal file
33
elf/tst-tunables-enable_secure-env.c
Normal file
@ -0,0 +1,33 @@
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/* Check enable_secure tunable handles removed ENV variables without
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assertions.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/capture_subprocess.h>
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#include <support/check.h>
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static int
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do_test (int argc, char *argv[])
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{
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/* Ensure that no assertions are hit when a dynamically linked application
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runs. This test requires that GLIBC_TUNABLES=glibc.rtld.enable_secure=1
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is set. */
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return 0;
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}
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#define TEST_FUNCTION_ARGV do_test
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#include <support/test-driver.c>
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