riscv: reject invalid syscalls below -1

Running "stress-ng --enosys 4 -t 20 -v" showed a large number of kernel oops with "Unable to handle kernel paging request at virtual address" message. This happens when enosys stressor starts testing random non-valid syscalls. I forgot to redirect any syscall below -1 to sys_ni_syscall. With the patch kernel oops messages are gone while running stress-ng enosys stressor. Signed-off-by: David Abdurachmanov <[email protected]> Fixes: 5340627 ("riscv: add support for SECCOMP and SECCOMP_FILTER") Signed-off-by: Paul Walmsley <[email protected]>
laijs · Dec 28, 2019 · 556f47a · 556f47a
1 parent 4d47ce1
commit 556f47a
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
@@ -246,6 +246,7 @@ check_syscall_nr:
 	 */
 	li t1, -1
 	beq a7, t1, ret_from_syscall_rejected
+	blt a7, t1, 1f
 	/* Call syscall */
 	la s0, sys_call_table
 	slli t0, a7, RISCV_LGPTR