arch/riscv/kernel/signal.c:129:15: sparse: sparse: incorrect type in assignment (different address spaces)

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   baeb9a7d8b60b021d907127509c44507539c15e5
commit: 3aff0c459e77ac0fb1c4d6884433467f797f7357 RISC-V: Drop invalid test from CONFIG_AS_HAS_OPTION_ARCH
date:   7 months ago
config: riscv-randconfig-r113-20240920 (https://download.01.org/0day-ci/archive/20240921/202409210356.qCeOh9PA-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 8663a75fa2f31299ab8d1d90288d9df92aadee88)
reproduce: (https://download.01.org/0day-ci/archive/20240921/202409210356.qCeOh9PA-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/202409210356.qCeOh9PA-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/riscv/kernel/signal.c:129:15: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __user *datap @@     got void * @@
   arch/riscv/kernel/signal.c:129:15: sparse:     expected void [noderef] __user *datap
   arch/riscv/kernel/signal.c:129:15: sparse:     got void *
>> arch/riscv/kernel/signal.c:129:15: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __user *datap @@     got void * @@
   arch/riscv/kernel/signal.c:129:15: sparse:     expected void [noderef] __user *datap
   arch/riscv/kernel/signal.c:129:15: sparse:     got void *
>> arch/riscv/kernel/signal.c:129:15: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __user *datap @@     got void * @@
   arch/riscv/kernel/signal.c:129:15: sparse:     expected void [noderef] __user *datap
   arch/riscv/kernel/signal.c:129:15: sparse:     got void *
>> arch/riscv/kernel/signal.c:129:15: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __user *datap @@     got void * @@
   arch/riscv/kernel/signal.c:129:15: sparse:     expected void [noderef] __user *datap
   arch/riscv/kernel/signal.c:129:15: sparse:     got void *

vim +129 arch/riscv/kernel/signal.c

8ee0b41898fa26 Greentime Hu 2023-06-05  110  
8ee0b41898fa26 Greentime Hu 2023-06-05  111  /*
8ee0b41898fa26 Greentime Hu 2023-06-05  112   * Restore Vector extension context from the user's signal frame. This function
8ee0b41898fa26 Greentime Hu 2023-06-05  113   * assumes a valid extension header. So magic and size checking must be done by
8ee0b41898fa26 Greentime Hu 2023-06-05  114   * the caller.
8ee0b41898fa26 Greentime Hu 2023-06-05  115   */
8ee0b41898fa26 Greentime Hu 2023-06-05  116  static long __restore_v_state(struct pt_regs *regs, void __user *sc_vec)
8ee0b41898fa26 Greentime Hu 2023-06-05  117  {
8ee0b41898fa26 Greentime Hu 2023-06-05  118  	long err;
8ee0b41898fa26 Greentime Hu 2023-06-05  119  	struct __sc_riscv_v_state __user *state = sc_vec;
8ee0b41898fa26 Greentime Hu 2023-06-05  120  	void __user *datap;
8ee0b41898fa26 Greentime Hu 2023-06-05  121  
8ee0b41898fa26 Greentime Hu 2023-06-05  122  	/* Copy everything of __sc_riscv_v_state except datap. */
8ee0b41898fa26 Greentime Hu 2023-06-05  123  	err = __copy_from_user(&current->thread.vstate, &state->v_state,
8ee0b41898fa26 Greentime Hu 2023-06-05  124  			       offsetof(struct __riscv_v_ext_state, datap));
8ee0b41898fa26 Greentime Hu 2023-06-05  125  	if (unlikely(err))
8ee0b41898fa26 Greentime Hu 2023-06-05  126  		return err;
8ee0b41898fa26 Greentime Hu 2023-06-05  127  
8ee0b41898fa26 Greentime Hu 2023-06-05  128  	/* Copy the pointer datap itself. */
8ee0b41898fa26 Greentime Hu 2023-06-05 @129  	err = __get_user(datap, &state->v_state.datap);
8ee0b41898fa26 Greentime Hu 2023-06-05  130  	if (unlikely(err))
8ee0b41898fa26 Greentime Hu 2023-06-05  131  		return err;
8ee0b41898fa26 Greentime Hu 2023-06-05  132  	/*
8ee0b41898fa26 Greentime Hu 2023-06-05  133  	 * Copy the whole vector content from user space datap. Use
8ee0b41898fa26 Greentime Hu 2023-06-05  134  	 * copy_from_user to prevent information leak.
8ee0b41898fa26 Greentime Hu 2023-06-05  135  	 */
8ee0b41898fa26 Greentime Hu 2023-06-05  136  	err = copy_from_user(current->thread.vstate.datap, datap, riscv_v_vsize);
8ee0b41898fa26 Greentime Hu 2023-06-05  137  	if (unlikely(err))
8ee0b41898fa26 Greentime Hu 2023-06-05  138  		return err;
8ee0b41898fa26 Greentime Hu 2023-06-05  139  
7df56cbc27e423 Andy Chiu    2024-01-15  140  	riscv_v_vstate_set_restore(current, regs);
8ee0b41898fa26 Greentime Hu 2023-06-05  141  
8ee0b41898fa26 Greentime Hu 2023-06-05  142  	return err;
8ee0b41898fa26 Greentime Hu 2023-06-05  143  }
8ee0b41898fa26 Greentime Hu 2023-06-05  144  #else
8ee0b41898fa26 Greentime Hu 2023-06-05  145  #define save_v_state(task, regs) (0)
8ee0b41898fa26 Greentime Hu 2023-06-05  146  #define __restore_v_state(task, regs) (0)
8ee0b41898fa26 Greentime Hu 2023-06-05  147  #endif
8ee0b41898fa26 Greentime Hu 2023-06-05  148  

:::::: The code at line 129 was first introduced by commit
:::::: 8ee0b41898fa26f66e32237f179b6989c65600d6 riscv: signal: Add sigcontext save/restore for vector

:::::: TO: Greentime Hu <greentime.hu@sifive.com>
:::::: CC: Palmer Dabbelt <palmer@rivosinc.com>

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