linux-kernel - Re: [PATCH] tee: optee: smc_abi: Fix use-after-free in optee_smc

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Date:   Mon, 2 Jan 2023 09:18:48 +0900
From:   Yoochan Lee <yoochan1026@...il.com>
To:     kernel test robot <lkp@...el.com>
Cc:     jens.wiklander@...aro.org, llvm@...ts.linux.dev,
        oe-kbuild-all@...ts.linux.dev, op-tee@...ts.trustedfirmware.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tee: optee: smc_abi: Fix use-after-free in optee_smc_open

I fix the errors in the previous patch.

>From 2046cc19aeaddb5f6fb5e9b1d9a380a116892657 Mon Sep 17 00:00:00 2001
From: Yoochan Lee <yoochan1026@...il.com>
Date: Mon, 2 Jan 2023 09:18:23 +0900
Subject: [PATCH 2/2] fix errors in previous patch

---
 drivers/tee/optee/smc_abi.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c
index 4fbec2acc255..be662f263f29 100644
--- a/drivers/tee/optee/smc_abi.c
+++ b/drivers/tee/optee/smc_abi.c
@@ -1103,12 +1103,7 @@ static void optee_smc_release_supp(struct
tee_context *ctx)
 {
  struct optee *optee = tee_get_drvdata(ctx->teedev);

- optee_release_helper(ctx, optee_close_session_helper);
- if (optee->scan_bus_wq) {
- destroy_workqueue(optee->scan_bus_wq);
- optee->scan_bus_wq = NULL;
- }
- optee_supp_release(&optee->supp);
+ optee_release_supp(ctx)
  kref_put(&optee->refcnt, optee_smc_delete);
 }

@@ -1116,7 +1111,7 @@ static void optee_smc_release(struct tee_context *ctx)
 {
  struct optee *optee = tee_get_drvdata(ctx->teedev);

- optee_release_helper(ctx, optee_close_session_helper);
+ optee_release(ctx);
  kref_put(&optee->refcnt, optee_smc_delete);
 }

--
2.39.0

2023년 1월 2일 (월) 오전 6:43, kernel test robot <lkp@...el.com>님이 작성:
>
> Hi Yoochan,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on linus/master]
> [also build test ERROR on v6.2-rc1 next-20221226]
> [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#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Yoochan-Lee/tee-optee-smc_abi-Fix-use-after-free-in-optee_smc_open/20221231-132046
> patch link:    https://lore.kernel.org/r/20221231051954.2038772-1-yoochan1026%40gmail.com
> patch subject: [PATCH] tee: optee: smc_abi: Fix use-after-free in optee_smc_open
> config: arm-randconfig-c002-20221231
> compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project f5700e7b69048de958172fb513b336564e7f8709)
> 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
>         # install arm cross compiling tool for clang build
>         # apt-get install binutils-arm-linux-gnueabi
>         # https://github.com/intel-lab-lkp/linux/commit/6d3d5f78a2463a577c1a908cdedda61affba9c01
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Yoochan-Lee/tee-optee-smc_abi-Fix-use-after-free-in-optee_smc_open/20221231-132046
>         git checkout 6d3d5f78a2463a577c1a908cdedda61affba9c01
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm olddefconfig
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/tee/optee/
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
> >> drivers/tee/optee/smc_abi.c:1106:2: error: call to undeclared function 'optee_release_helper'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
>            optee_release_helper(ctx, optee_close_session_helper);
>            ^
>    drivers/tee/optee/smc_abi.c:1106:2: note: did you mean 'optee_release_supp'?
>    drivers/tee/optee/optee_private.h:258:6: note: 'optee_release_supp' declared here
>    void optee_release_supp(struct tee_context *ctx);
>         ^
>    drivers/tee/optee/smc_abi.c:1119:2: error: call to undeclared function 'optee_release_helper'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
>            optee_release_helper(ctx, optee_close_session_helper);
>            ^
>    2 errors generated.
>
>
> vim +/optee_release_helper +1106 drivers/tee/optee/smc_abi.c
>
>   1101
>   1102  static void optee_smc_release_supp(struct tee_context *ctx)
>   1103  {
>   1104          struct optee *optee = tee_get_drvdata(ctx->teedev);
>   1105
> > 1106          optee_release_helper(ctx, optee_close_session_helper);
>   1107          if (optee->scan_bus_wq) {
>   1108                  destroy_workqueue(optee->scan_bus_wq);
>   1109                  optee->scan_bus_wq = NULL;
>   1110          }
>   1111          optee_supp_release(&optee->supp);
>   1112          kref_put(&optee->refcnt, optee_smc_delete);
>   1113  }
>   1114
>
> --
> 0-DAY CI Kernel Test Service
> https://01.org/lkp