From: Andreas Schwab <schwab@xxxxxxx>
commit cf7b2ae4d70432fa94ebba3fbaab825481ae7189 upstream.
Properly return -ENOSYS for syscall -1 instead of leaving the return value
uninitialized. This fixes the strace teststuite.
Fixes: 5340627e3fe0 ("riscv: add support for SECCOMP and SECCOMP_FILTER")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Andreas Schwab <schwab@xxxxxxx>
Reviewed-by: Tycho Andersen <tycho@tycho.pizza>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/riscv/kernel/entry.S | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
--- 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
