* arch/x86/kernel/shstk.c:295:55: sparse: sparse: cast removes address space '__user' of expression
@ 2024-01-06 19:47 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2024-01-06 19:47 UTC (permalink / raw)
To: Rick Edgecombe
Cc: oe-kbuild-all, linux-kernel, Dave Hansen, Yu-cheng Yu,
Borislav Petkov (AMD), Kees Cook
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 95c8a35f1c017327eab3b6a2ff5c04255737c856
commit: 05e36022c0543ba55a3de55af455b00cb3eb4fcc x86/shstk: Handle signals for shadow stack
date: 5 months ago
config: x86_64-randconfig-123-20240106 (https://download.01.org/0day-ci/archive/20240107/202401070321.axBUxYMQ-lkp@intel.com/config)
compiler: ClangBuiltLinux clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240107/202401070321.axBUxYMQ-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401070321.axBUxYMQ-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
arch/x86/kernel/shstk.c:244:29: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [noderef] [usertype] __user *addr @@ got void *[noderef] __user @@
arch/x86/kernel/shstk.c:244:29: sparse: expected unsigned long long [noderef] [usertype] __user *addr
arch/x86/kernel/shstk.c:244:29: sparse: got void *[noderef] __user
>> arch/x86/kernel/shstk.c:295:55: sparse: sparse: cast removes address space '__user' of expression
vim +/__user +295 arch/x86/kernel/shstk.c
271
272 int setup_signal_shadow_stack(struct ksignal *ksig)
273 {
274 void __user *restorer = ksig->ka.sa.sa_restorer;
275 unsigned long ssp;
276 int err;
277
278 if (!cpu_feature_enabled(X86_FEATURE_USER_SHSTK) ||
279 !features_enabled(ARCH_SHSTK_SHSTK))
280 return 0;
281
282 if (!restorer)
283 return -EINVAL;
284
285 ssp = get_user_shstk_addr();
286 if (unlikely(!ssp))
287 return -EINVAL;
288
289 err = shstk_push_sigframe(&ssp);
290 if (unlikely(err))
291 return err;
292
293 /* Push restorer address */
294 ssp -= SS_FRAME_SIZE;
> 295 err = write_user_shstk_64((u64 __user *)ssp, (u64)restorer);
296 if (unlikely(err))
297 return -EFAULT;
298
299 fpregs_lock_and_load();
300 wrmsrl(MSR_IA32_PL3_SSP, ssp);
301 fpregs_unlock();
302
303 return 0;
304 }
305
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread* arch/x86/kernel/shstk.c:295:55: sparse: sparse: cast removes address space '__user' of expression
@ 2024-01-07 16:31 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2024-01-07 16:31 UTC (permalink / raw)
To: Rick Edgecombe
Cc: oe-kbuild-all, linux-kernel, Dave Hansen, Yu-cheng Yu,
Borislav Petkov (AMD), Kees Cook
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 52b1853b080a082ec3749c3a9577f6c71b1d4a90
commit: 05e36022c0543ba55a3de55af455b00cb3eb4fcc x86/shstk: Handle signals for shadow stack
date: 5 months ago
config: x86_64-randconfig-123-20240106 (https://download.01.org/0day-ci/archive/20240108/202401080003.duO4RmjK-lkp@intel.com/config)
compiler: ClangBuiltLinux clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240108/202401080003.duO4RmjK-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401080003.duO4RmjK-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
arch/x86/kernel/shstk.c:244:29: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [noderef] [usertype] __user *addr @@ got void *[noderef] __user @@
arch/x86/kernel/shstk.c:244:29: sparse: expected unsigned long long [noderef] [usertype] __user *addr
arch/x86/kernel/shstk.c:244:29: sparse: got void *[noderef] __user
>> arch/x86/kernel/shstk.c:295:55: sparse: sparse: cast removes address space '__user' of expression
vim +/__user +295 arch/x86/kernel/shstk.c
271
272 int setup_signal_shadow_stack(struct ksignal *ksig)
273 {
274 void __user *restorer = ksig->ka.sa.sa_restorer;
275 unsigned long ssp;
276 int err;
277
278 if (!cpu_feature_enabled(X86_FEATURE_USER_SHSTK) ||
279 !features_enabled(ARCH_SHSTK_SHSTK))
280 return 0;
281
282 if (!restorer)
283 return -EINVAL;
284
285 ssp = get_user_shstk_addr();
286 if (unlikely(!ssp))
287 return -EINVAL;
288
289 err = shstk_push_sigframe(&ssp);
290 if (unlikely(err))
291 return err;
292
293 /* Push restorer address */
294 ssp -= SS_FRAME_SIZE;
> 295 err = write_user_shstk_64((u64 __user *)ssp, (u64)restorer);
296 if (unlikely(err))
297 return -EFAULT;
298
299 fpregs_lock_and_load();
300 wrmsrl(MSR_IA32_PL3_SSP, ssp);
301 fpregs_unlock();
302
303 return 0;
304 }
305
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
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