diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2022-08-08 16:07:21 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-25 11:18:27 +0200 |
| commit | 9e9151768bde6405ddec3d07fba80fa5e197b026 (patch) | |
| tree | 893778b2a82ee6157393b9e53af0bc4ac8056da3 /arch/nios2 | |
| parent | 73c088373234d47533c91526e828b66de387ed52 (diff) | |
nios2: traced syscall does need to check the syscall number
commit 25ba820ef36bdbaf9884adeac69b6e1821a7df76 upstream.
all checks done before letting the tracer modify the register
state are worthless...
Fixes: 82ed08dd1b0e ("nios2: Exception handling")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/nios2')
| -rw-r--r-- | arch/nios2/kernel/entry.S | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/nios2/kernel/entry.S b/arch/nios2/kernel/entry.S index 4e0bf52e68ea..b393600191ad 100644 --- a/arch/nios2/kernel/entry.S +++ b/arch/nios2/kernel/entry.S @@ -255,9 +255,9 @@ traced_system_call: ldw r6, PT_R6(sp) ldw r7, PT_R7(sp) - /* Fetch the syscall function, we don't need to check the boundaries - * since this is already done. - */ + /* Fetch the syscall function. */ + movui r1, __NR_syscalls + bgeu r2, r1, traced_invsyscall slli r1, r2, 2 movhi r11,%hiadj(sys_call_table) add r1, r1, r11 @@ -287,6 +287,11 @@ end_translate_rc_and_ret2: RESTORE_SWITCH_STACK br ret_from_exception + /* If the syscall number was invalid return ENOSYS */ +traced_invsyscall: + movi r2, -ENOSYS + br translate_rc_and_ret2 + Luser_return: GET_THREAD_INFO r11 /* get thread_info pointer */ ldw r10, TI_FLAGS(r11) /* get thread_info->flags */ |