diff options
| -rw-r--r-- | arch/mips/kernel/scall32-o32.S | 37 | ||||
| -rw-r--r-- | arch/mips/kernel/scall64-o32.S | 33 |
2 files changed, 52 insertions, 18 deletions
diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S index 6e8de80bb446..4cc13508d967 100644 --- a/arch/mips/kernel/scall32-o32.S +++ b/arch/mips/kernel/scall32-o32.S @@ -73,10 +73,11 @@ NESTED(handle_sys, PT_SIZE, sp) .set noreorder .set nomacro -1: user_lw(t5, 16(t0)) # argument #5 from usp -4: user_lw(t6, 20(t0)) # argument #6 from usp -3: user_lw(t7, 24(t0)) # argument #7 from usp -2: user_lw(t8, 28(t0)) # argument #8 from usp +load_a4: user_lw(t5, 16(t0)) # argument #5 from usp +load_a5: user_lw(t6, 20(t0)) # argument #6 from usp +load_a6: user_lw(t7, 24(t0)) # argument #7 from usp +load_a7: user_lw(t8, 28(t0)) # argument #8 from usp +loads_done: sw t5, 16(sp) # argument #5 to ksp sw t6, 20(sp) # argument #6 to ksp @@ -85,10 +86,10 @@ NESTED(handle_sys, PT_SIZE, sp) .set pop .section __ex_table,"a" - PTR 1b,bad_stack - PTR 2b,bad_stack - PTR 3b,bad_stack - PTR 4b,bad_stack + PTR load_a4, bad_stack_a4 + PTR load_a5, bad_stack_a5 + PTR load_a6, bad_stack_a6 + PTR load_a7, bad_stack_a7 .previous lw t0, TI_FLAGS($28) # syscall tracing enabled? @@ -153,8 +154,8 @@ syscall_trace_entry: /* ------------------------------------------------------------------------ */ /* - * The stackpointer for a call with more than 4 arguments is bad. - * We probably should handle this case a bit more drastic. + * Our open-coded access area sanity test for the stack pointer + * failed. We probably should handle this case a bit more drastic. */ bad_stack: li v0, EFAULT @@ -163,6 +164,22 @@ bad_stack: sw t0, PT_R7(sp) j o32_syscall_exit +bad_stack_a4: + li t5, 0 + b load_a5 + +bad_stack_a5: + li t6, 0 + b load_a6 + +bad_stack_a6: + li t7, 0 + b load_a7 + +bad_stack_a7: + li t8, 0 + b loads_done + /* * The system call does not exist in this kernel */ diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S index d07b210fbeff..66d618bb2fa2 100644 --- a/arch/mips/kernel/scall64-o32.S +++ b/arch/mips/kernel/scall64-o32.S @@ -69,16 +69,17 @@ NESTED(handle_sys, PT_SIZE, sp) daddu t1, t0, 32 bltz t1, bad_stack -1: lw a4, 16(t0) # argument #5 from usp -2: lw a5, 20(t0) # argument #6 from usp -3: lw a6, 24(t0) # argument #7 from usp -4: lw a7, 28(t0) # argument #8 from usp (for indirect syscalls) +load_a4: lw a4, 16(t0) # argument #5 from usp +load_a5: lw a5, 20(t0) # argument #6 from usp +load_a6: lw a6, 24(t0) # argument #7 from usp +load_a7: lw a7, 28(t0) # argument #8 from usp +loads_done: .section __ex_table,"a" - PTR 1b, bad_stack - PTR 2b, bad_stack - PTR 3b, bad_stack - PTR 4b, bad_stack + PTR load_a4, bad_stack_a4 + PTR load_a5, bad_stack_a5 + PTR load_a6, bad_stack_a6 + PTR load_a7, bad_stack_a7 .previous li t1, _TIF_WORK_SYSCALL_ENTRY @@ -167,6 +168,22 @@ bad_stack: sd t0, PT_R7(sp) j o32_syscall_exit +bad_stack_a4: + li a4, 0 + b load_a5 + +bad_stack_a5: + li a5, 0 + b load_a6 + +bad_stack_a6: + li a6, 0 + b load_a7 + +bad_stack_a7: + li a7, 0 + b loads_done + not_o32_scall: /* * This is not an o32 compatibility syscall, pass it on |
