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riscv: return -ENOSYS for syscall -1

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Properly return -ENOSYS for syscall -1 instead of leaving the return value
uninitialized.  This fixes the strace teststuite.

Fixes: 5340627e3f ("riscv: add support for SECCOMP and SECCOMP_FILTER")
Cc: stable@vger.kernel.org
Signed-off-by: Andreas Schwab <schwab@suse.de>
Reviewed-by: Tycho Andersen <tycho@tycho.pizza>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Andreas Schwab 2020-12-21 23:52:00 +01:00 committed by Palmer Dabbelt
parent e71ba9452f
commit cf7b2ae4d7
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1 changed files with 1 additions and 8 deletions
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9
arch/riscv/kernel/entry.S
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@ -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