riscv: lib: uaccess: fix CSR_STATUS SR_SUM bit

Since commit 5d8544e ("RISC-V: Generic library routines and assembly")
and commit ebcbd75 ("riscv: Fix the bug in memory access fixup code"),
if __clear_user and __copy_user return from an fixup branch,
CSR_STATUS SR_SUM bit will be set, it is a vulnerability, so that
S-mode memory accesses to pages that are accessible by U-mode will success.
Disable S-mode access to U-mode memory should clear SR_SUM bit.

Fixes: 5d8544e ("RISC-V: Generic library routines and assembly")
Fixes: ebcbd75 ("riscv: Fix the bug in memory access fixup code")
Signed-off-by: Chen Lifu <chenlifu@huawei.com>
Reviewed-by: Ben Dooks <ben.dooks@codethink.co.uk>
Link: https://lore.kernel.org/r/20220615014714.1650349-1-chenlifu@huawei.com
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/lib/uaccess.S

@@ -175,7 +175,7 @@ ENTRY(__asm_copy_from_user)
 	/* Exception fixup code */
 10:
 	/* Disable access to user memory */
-	csrs CSR_STATUS, t6
+	csrc CSR_STATUS, t6
 	mv a0, t5
 	ret
 ENDPROC(__asm_copy_to_user)
@@ -227,7 +227,7 @@ ENTRY(__clear_user)
 	/* Exception fixup code */
 11:
 	/* Disable access to user memory */
-	csrs CSR_STATUS, t6
+	csrc CSR_STATUS, t6
 	mv a0, a1
 	ret
 ENDPROC(__clear_user)