riscv: return -ENOSYS for syscall -1

commit cf7b2ae upstream. Properly return -ENOSYS for syscall -1 instead of leaving the return value uninitialized. This fixes the strace teststuite. Fixes: 5340627 ("riscv: add support for SECCOMP and SECCOMP_FILTER") Cc: [email protected] Signed-off-by: Andreas Schwab <[email protected]> Reviewed-by: Tycho Andersen <[email protected]> Signed-off-by: Palmer Dabbelt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
frank-w · Jan 19, 2021 · 7c4ced3 · 7c4ced3
1 parent eae7b19
commit 7c4ced3
Showing 1 changed file with 1 addition and 8 deletions.
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
@@ -186,14 +186,7 @@ check_syscall_nr:
 	 * Syscall number held in a7.
 	 * If syscall number is above allowed value, redirect to ni_syscall.
 	 */
-	bge a7, t0, 1f
-	/*
-	 * Check if syscall is rejected by tracer, i.e., a7 == -1.
-	 * If yes, we pretend it was executed.
-	 */
-	li t1, -1
-	beq a7, t1, ret_from_syscall_rejected
-	blt a7, t1, 1f
+	bgeu a7, t0, 1f
 	/* Call syscall */
 	la s0, sys_call_table
 	slli t0, a7, RISCV_LGPTR