[PATCH] KEYS: trusted: fix crash when TPM/TEE are built as module

[PATCH] KEYS: trusted: fix crash when TPM/TEE are built as module

[Tong Zhang]

when TCG_TPM and TEE are built as module, trusted_key_sources will be an
empty array, loading it won't do what it is supposed to do and unloading
it will cause kernel crash.

To reproduce:
$ modprobe trusted
$ modprobe -r trusted

[  173.749423] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[  173.755268] Backtrace:
[  173.755378]  cleanup_trusted [trusted] from sys_delete_module+0x15c/0x22c
[  173.755589]  sys_delete_module from ret_fast_syscall+0x0/0x1c

To fix this issue, we also need to check CONFIG_TCG_TPM_MODULE and
CONFIG_TEE_MODULE.

Fixes: 5d0682be3189 ("KEYS: trusted: Add generic trusted keys framework")
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
---
 security/keys/trusted-keys/trusted_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
index d5c891d8d353..b3a3b2f2d4a4 100644
--- a/security/keys/trusted-keys/trusted_core.c
+++ b/security/keys/trusted-keys/trusted_core.c
@@ -27,10 +27,10 @@ module_param_named(source, trusted_key_source, charp, 0);
 MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
 
 static const struct trusted_key_source trusted_key_sources[] = {
-#if defined(CONFIG_TCG_TPM)
+#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
 	{ "tpm", &trusted_key_tpm_ops },
 #endif
-#if defined(CONFIG_TEE)
+#if defined(CONFIG_TEE) || defined(CONFIG_TEE_MODULE)
 	{ "tee", &trusted_key_tee_ops },
 #endif
 };
-- 
2.25.1

Re: [PATCH] KEYS: trusted: fix crash when TPM/TEE are built as module

[Ahmad Fatoum]

Hello Tong,

On 04.02.22 21:03, Tong Zhang wrote:
> when TCG_TPM and TEE are built as module, trusted_key_sources will be an
> empty array, loading it won't do what it is supposed to do and unloading
> it will cause kernel crash.

Jarkko reported picking up an equivalent fix two months ago:
https://lkml.kernel.org/keyrings/YadRAWbl2aiapf8l@iki.fi/

But it seems to have never made it to Linus.

Cheers,
Ahmad

> 
> To reproduce:
> $ modprobe trusted
> $ modprobe -r trusted
> 
> [  173.749423] Unable to handle kernel NULL pointer dereference at virtual address 00000000
> [  173.755268] Backtrace:
> [  173.755378]  cleanup_trusted [trusted] from sys_delete_module+0x15c/0x22c
> [  173.755589]  sys_delete_module from ret_fast_syscall+0x0/0x1c
> 
> To fix this issue, we also need to check CONFIG_TCG_TPM_MODULE and
> CONFIG_TEE_MODULE.
> 
> Fixes: 5d0682be3189 ("KEYS: trusted: Add generic trusted keys framework")
> Signed-off-by: Tong Zhang <ztong0001@gmail.com>
> ---
>  security/keys/trusted-keys/trusted_core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
> index d5c891d8d353..b3a3b2f2d4a4 100644
> --- a/security/keys/trusted-keys/trusted_core.c
> +++ b/security/keys/trusted-keys/trusted_core.c
> @@ -27,10 +27,10 @@ module_param_named(source, trusted_key_source, charp, 0);
>  MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
>  
>  static const struct trusted_key_source trusted_key_sources[] = {
> -#if defined(CONFIG_TCG_TPM)
> +#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
>  	{ "tpm", &trusted_key_tpm_ops },
>  #endif
> -#if defined(CONFIG_TEE)
> +#if defined(CONFIG_TEE) || defined(CONFIG_TEE_MODULE)
>  	{ "tee", &trusted_key_tee_ops },
>  #endif
>  };


-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH] KEYS: trusted: fix crash when TPM/TEE are built as module

[Tong Zhang]

On Sun, Feb 6, 2022 at 2:36 AM Ahmad Fatoum <a.fatoum@pengutronix.de> wrote:
>
> Hello Tong,
>
> On 04.02.22 21:03, Tong Zhang wrote:
> > when TCG_TPM and TEE are built as module, trusted_key_sources will be an
> > empty array, loading it won't do what it is supposed to do and unloading
> > it will cause kernel crash.
>
> Jarkko reported picking up an equivalent fix two months ago:
> https://lkml.kernel.org/keyrings/YadRAWbl2aiapf8l@iki.fi/
>
> But it seems to have never made it to Linus.
>
> Cheers,
> Ahmad
>
> >
> > To reproduce:
> > $ modprobe trusted
> > $ modprobe -r trusted
> >
> > [  173.749423] Unable to handle kernel NULL pointer dereference at virtual address 00000000
> > [  173.755268] Backtrace:
> > [  173.755378]  cleanup_trusted [trusted] from sys_delete_module+0x15c/0x22c
> > [  173.755589]  sys_delete_module from ret_fast_syscall+0x0/0x1c
> >
> > To fix this issue, we also need to check CONFIG_TCG_TPM_MODULE and
> > CONFIG_TEE_MODULE.
> >
> > Fixes: 5d0682be3189 ("KEYS: trusted: Add generic trusted keys framework")
> > Signed-off-by: Tong Zhang <ztong0001@gmail.com>
> > ---
> >  security/keys/trusted-keys/trusted_core.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
> > index d5c891d8d353..b3a3b2f2d4a4 100644
> > --- a/security/keys/trusted-keys/trusted_core.c
> > +++ b/security/keys/trusted-keys/trusted_core.c
> > @@ -27,10 +27,10 @@ module_param_named(source, trusted_key_source, charp, 0);
> >  MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
> >
> >  static const struct trusted_key_source trusted_key_sources[] = {
> > -#if defined(CONFIG_TCG_TPM)
> > +#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
> >       { "tpm", &trusted_key_tpm_ops },
> >  #endif
> > -#if defined(CONFIG_TEE)
> > +#if defined(CONFIG_TEE) || defined(CONFIG_TEE_MODULE)
> >       { "tee", &trusted_key_tee_ops },
> >  #endif
> >  };
>
>
> --
> Pengutronix e.K.                           |                             |
> Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
> 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Hi Ahmad,
Thanks for letting me know.
That fix looks good to me.
- Tong

Re: [PATCH] KEYS: trusted: fix crash when TPM/TEE are built as module

[kernel test robot]

Hi Tong,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on v5.17-rc2]
[also build test ERROR on next-20220208]
[cannot apply to jmorris-security/next-testing]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Tong-Zhang/KEYS-trusted-fix-crash-when-TPM-TEE-are-built-as-module/20220205-040706
base:    26291c54e111ff6ba87a164d85d4a4e134b7315c
config: i386-randconfig-a011 (https://download.01.org/0day-ci/archive/20220209/202202090354.jnH19acv-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project e8bff9ae54a55b4dbfeb6ba55f723abbd81bf494)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/1f9dab49ae11af2bde1b057f7104ded0714ae7dd
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Tong-Zhang/KEYS-trusted-fix-crash-when-TPM-TEE-are-built-as-module/20220205-040706
        git checkout 1f9dab49ae11af2bde1b057f7104ded0714ae7dd
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: trusted_key_tee_ops
   >>> referenced by trusted_core.c
   >>>               keys/trusted-keys/trusted_core.o:(trusted_key_sources) in archive security/built-in.a

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Re: [PATCH] KEYS: trusted: fix crash when TPM/TEE are built as module

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 1997 bytes --]

Hi Tong,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on v5.17-rc2]
[also build test ERROR on next-20220208]
[cannot apply to jmorris-security/next-testing]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Tong-Zhang/KEYS-trusted-fix-crash-when-TPM-TEE-are-built-as-module/20220205-040706
base:    26291c54e111ff6ba87a164d85d4a4e134b7315c
config: i386-randconfig-a011 (https://download.01.org/0day-ci/archive/20220209/202202090354.jnH19acv-lkp(a)intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project e8bff9ae54a55b4dbfeb6ba55f723abbd81bf494)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/1f9dab49ae11af2bde1b057f7104ded0714ae7dd
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Tong-Zhang/KEYS-trusted-fix-crash-when-TPM-TEE-are-built-as-module/20220205-040706
        git checkout 1f9dab49ae11af2bde1b057f7104ded0714ae7dd
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: trusted_key_tee_ops
   >>> referenced by trusted_core.c
   >>>               keys/trusted-keys/trusted_core.o:(trusted_key_sources) in archive security/built-in.a

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

Re: [PATCH] KEYS: trusted: fix crash when TPM/TEE are built as module

[Jarkko Sakkinen]

On Fri, Feb 04, 2022 at 12:03:42PM -0800, Tong Zhang wrote:
> when TCG_TPM and TEE are built as module, trusted_key_sources will be an
> empty array, loading it won't do what it is supposed to do and unloading
> it will cause kernel crash.
> 
> To reproduce:
> $ modprobe trusted
> $ modprobe -r trusted
> 
> [  173.749423] Unable to handle kernel NULL pointer dereference at virtual address 00000000
> [  173.755268] Backtrace:
> [  173.755378]  cleanup_trusted [trusted] from sys_delete_module+0x15c/0x22c
> [  173.755589]  sys_delete_module from ret_fast_syscall+0x0/0x1c
> 
> To fix this issue, we also need to check CONFIG_TCG_TPM_MODULE and
> CONFIG_TEE_MODULE.
> 
> Fixes: 5d0682be3189 ("KEYS: trusted: Add generic trusted keys framework")
> Signed-off-by: Tong Zhang <ztong0001@gmail.com>
> ---
>  security/keys/trusted-keys/trusted_core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
> index d5c891d8d353..b3a3b2f2d4a4 100644
> --- a/security/keys/trusted-keys/trusted_core.c
> +++ b/security/keys/trusted-keys/trusted_core.c
> @@ -27,10 +27,10 @@ module_param_named(source, trusted_key_source, charp, 0);
>  MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
>  
>  static const struct trusted_key_source trusted_key_sources[] = {
> -#if defined(CONFIG_TCG_TPM)
> +#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
>  	{ "tpm", &trusted_key_tpm_ops },
>  #endif
> -#if defined(CONFIG_TEE)
> +#if defined(CONFIG_TEE) || defined(CONFIG_TEE_MODULE)
>  	{ "tee", &trusted_key_tee_ops },
>  #endif
>  };
> -- 
> 2.25.1
> 


Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>

BR, Jarkko

Re: [PATCH] KEYS: trusted: fix crash when TPM/TEE are built as module

[Jarkko Sakkinen]

On Sun, Feb 06, 2022 at 11:36:48AM +0100, Ahmad Fatoum wrote:
> Hello Tong,
> 
> On 04.02.22 21:03, Tong Zhang wrote:
> > when TCG_TPM and TEE are built as module, trusted_key_sources will be an
> > empty array, loading it won't do what it is supposed to do and unloading
> > it will cause kernel crash.
> 
> Jarkko reported picking up an equivalent fix two months ago:
> https://lkml.kernel.org/keyrings/YadRAWbl2aiapf8l@iki.fi/
> 
> But it seems to have never made it to Linus.

Sorry, was not done purposely. I pushed the original fix.

BR, Jarkko