mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-09 14:50:05 +00:00
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:
parent
14e56bd4ce
commit
59974938fe
10
elf/Makefile
10
elf/Makefile
@ -315,6 +315,7 @@ tests := \
|
||||
tst-leaks1 \
|
||||
tst-stringtable \
|
||||
tst-tls9 \
|
||||
tst-tunables-enable_secure-env \
|
||||
# tests
|
||||
|
||||
tests-internal := \
|
||||
@ -1188,6 +1189,7 @@ tests-special += \
|
||||
$(objpfx)tst-trace3.out \
|
||||
$(objpfx)tst-trace4.out \
|
||||
$(objpfx)tst-trace5.out \
|
||||
$(objpfx)tst-tunables-enable_secure-env.out \
|
||||
$(objpfx)tst-unused-dep-cmp.out \
|
||||
$(objpfx)tst-unused-dep.out \
|
||||
# tests-special
|
||||
@ -2215,6 +2217,14 @@ $(objpfx)tst-unused-dep-cmp.out: $(objpfx)tst-unused-dep.out
|
||||
cmp $< /dev/null > $@; \
|
||||
$(evaluate-test)
|
||||
|
||||
$(objpfx)tst-tunables-enable_secure-env.out: $(objpfx)tst-tunables-enable_secure-env
|
||||
$(test-wrapper-env) \
|
||||
GLIBC_TUNABLES=glibc.rtld.enable_secure=1 \
|
||||
$(rtld-prefix) \
|
||||
$< > $@; \
|
||||
$(evaluate-test)
|
||||
|
||||
|
||||
$(objpfx)tst-audit11.out: $(objpfx)tst-auditmod11.so $(objpfx)tst-audit11mod1.so
|
||||
tst-audit11-ENV = LD_AUDIT=$(objpfx)tst-auditmod11.so
|
||||
$(objpfx)tst-audit11mod1.so: $(objpfx)tst-audit11mod2.so
|
||||
|
31
elf/rtld.c
31
elf/rtld.c
@ -155,7 +155,7 @@ static void dl_main_state_init (struct dl_main_state *state);
|
||||
Since all of them start with `LD_' we are a bit smarter while finding
|
||||
all the entries. */
|
||||
extern char **_environ attribute_hidden;
|
||||
static void process_envvars (struct dl_main_state *state);
|
||||
static int process_envvars (struct dl_main_state *state);
|
||||
|
||||
int _dl_argc attribute_relro attribute_hidden;
|
||||
char **_dl_argv attribute_relro = NULL;
|
||||
@ -1289,7 +1289,7 @@ rtld_setup_main_map (struct link_map *main_map)
|
||||
_dl_argv and _dl_argc accordingly. Those arguments are removed from
|
||||
argv here. */
|
||||
static void
|
||||
_dl_start_args_adjust (int skip_args)
|
||||
_dl_start_args_adjust (int skip_args, int skip_env)
|
||||
{
|
||||
void **sp = (void **) (_dl_argv - skip_args - 1);
|
||||
void **p = sp + skip_args;
|
||||
@ -1321,7 +1321,7 @@ _dl_start_args_adjust (int skip_args)
|
||||
while (*p != NULL);
|
||||
|
||||
#ifdef HAVE_AUX_VECTOR
|
||||
void **auxv = (void **) GLRO(dl_auxv) - skip_args;
|
||||
void **auxv = (void **) GLRO(dl_auxv) - skip_args - skip_env;
|
||||
GLRO(dl_auxv) = (ElfW(auxv_t) *) auxv; /* Aliasing violation. */
|
||||
assert (auxv == sp + 1);
|
||||
|
||||
@ -1352,6 +1352,7 @@ dl_main (const ElfW(Phdr) *phdr,
|
||||
unsigned int i;
|
||||
bool rtld_is_main = false;
|
||||
void *tcbp = NULL;
|
||||
int skip_env = 0;
|
||||
|
||||
struct dl_main_state state;
|
||||
dl_main_state_init (&state);
|
||||
@ -1365,7 +1366,7 @@ dl_main (const ElfW(Phdr) *phdr,
|
||||
#endif
|
||||
|
||||
/* Process the environment variable which control the behaviour. */
|
||||
process_envvars (&state);
|
||||
skip_env = process_envvars (&state);
|
||||
|
||||
#ifndef HAVE_INLINED_SYSCALLS
|
||||
/* Set up a flag which tells we are just starting. */
|
||||
@ -1630,7 +1631,7 @@ dl_main (const ElfW(Phdr) *phdr,
|
||||
_dl_argv[0] = argv0;
|
||||
|
||||
/* Adjust arguments for the application entry point. */
|
||||
_dl_start_args_adjust (_dl_argv - orig_argv);
|
||||
_dl_start_args_adjust (_dl_argv - orig_argv, skip_env);
|
||||
}
|
||||
else
|
||||
{
|
||||
@ -2534,11 +2535,12 @@ a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n");
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
static int
|
||||
process_envvars_secure (struct dl_main_state *state)
|
||||
{
|
||||
char **runp = _environ;
|
||||
char *envline;
|
||||
int skip_env = 0;
|
||||
|
||||
while ((envline = _dl_next_ld_env_entry (&runp)) != NULL)
|
||||
{
|
||||
@ -2580,6 +2582,14 @@ process_envvars_secure (struct dl_main_state *state)
|
||||
const char *nextp = UNSECURE_ENVVARS;
|
||||
do
|
||||
{
|
||||
/* Keep track of the number of environment variables that were set in
|
||||
the environment and are unset below. Use getenv() which returns
|
||||
non-NULL if the variable is set in the environment. This count is
|
||||
needed if we need to adjust the location of the AUX vector on the
|
||||
stack when running ld.so directly. */
|
||||
if (getenv (nextp) != NULL)
|
||||
skip_env++;
|
||||
|
||||
unsetenv (nextp);
|
||||
nextp = strchr (nextp, '\0') + 1;
|
||||
}
|
||||
@ -2592,6 +2602,8 @@ process_envvars_secure (struct dl_main_state *state)
|
||||
|| state->mode != rtld_mode_normal
|
||||
|| state->version_info)
|
||||
_exit (5);
|
||||
|
||||
return skip_env;
|
||||
}
|
||||
|
||||
static void
|
||||
@ -2745,13 +2757,16 @@ process_envvars_default (struct dl_main_state *state)
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
static int
|
||||
process_envvars (struct dl_main_state *state)
|
||||
{
|
||||
int skip_env = 0;
|
||||
if (__glibc_unlikely (__libc_enable_secure))
|
||||
process_envvars_secure (state);
|
||||
skip_env += process_envvars_secure (state);
|
||||
else
|
||||
process_envvars_default (state);
|
||||
|
||||
return skip_env;
|
||||
}
|
||||
|
||||
#if HP_TIMING_INLINE
|
||||
|
33
elf/tst-tunables-enable_secure-env.c
Normal file
33
elf/tst-tunables-enable_secure-env.c
Normal file
@ -0,0 +1,33 @@
|
||||
/* Check enable_secure tunable handles removed ENV variables without
|
||||
assertions.
|
||||
Copyright (C) 2024 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 <support/capture_subprocess.h>
|
||||
#include <support/check.h>
|
||||
|
||||
static int
|
||||
do_test (int argc, char *argv[])
|
||||
{
|
||||
/* Ensure that no assertions are hit when a dynamically linked application
|
||||
runs. This test requires that GLIBC_TUNABLES=glibc.rtld.enable_secure=1
|
||||
is set. */
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define TEST_FUNCTION_ARGV do_test
|
||||
#include <support/test-driver.c>
|
Loading…
Reference in New Issue
Block a user