arm64: unwind: reference pt_regs via embedded stack frame
As it turns out, the unwind code is slightly broken, and probably has been for a while. The problem is in the dumping of the exception stack, which is intended to dump the contents of the pt_regs struct at each level in the call stack where an exception was taken and routed to a routine marked as __exception (which means its stack frame is right below the pt_regs struct on the stack). 'Right below the pt_regs struct' is ill defined, though: the unwind code assigns 'frame pointer + 0x10' to the .sp member of the stackframe struct at each level, and dump_backtrace() happily dereferences that as the pt_regs pointer when encountering an __exception routine. However, the actual size of the stack frame created by this routine (which could be one of many __exception routines we have in the kernel) is not known, and so frame.sp is pretty useless to figure out where struct pt_regs really is. So it seems the only way to ensure that we can find our struct pt_regs when walking the stack frames is to put it at a known fixed offset of the stack frame pointer that is passed to such __exception routines. The simplest way to do that is to put it inside pt_regs itself, which is the main change implemented by this patch. As a bonus, doing this allows us to get rid of a fair amount of cruft related to walking from one stack to the other, which is especially nice since we intend to introduce yet another stack for overflow handling once we add support for vmapped stacks. It also fixes an inconsistency where we only add a stack frame pointing to ELR_EL1 if we are executing from the IRQ stack but not when we are executing from the task stack. To consistly identify exceptions regs even in the presence of exceptions taken from entry code, we must check whether the next frame was created by entry text, rather than whether the current frame was crated by exception text. To avoid backtracing using PCs that fall in the idmap, or are controlled by userspace, we must explcitly zero the FP and LR in startup paths, and must ensure that the frame embedded in pt_regs is zeroed upon entry from EL0. To avoid these NULL entries showin in the backtrace, unwind_frame() is updated to avoid them. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> [Mark: compare current frame against .entry.text, avoid bogus PCs] Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Will Deacon <will.deacon@arm.com>
This commit is contained in:
parent
c736533075
commit
7326749801
|
@ -16,31 +16,6 @@ struct pt_regs;
|
|||
|
||||
DECLARE_PER_CPU(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack);
|
||||
|
||||
/*
|
||||
* The highest address on the stack, and the first to be used. Used to
|
||||
* find the dummy-stack frame put down by el?_irq() in entry.S, which
|
||||
* is structured as follows:
|
||||
*
|
||||
* ------------
|
||||
* | | <- irq_stack_ptr
|
||||
* top ------------
|
||||
* | x19 | <- irq_stack_ptr - 0x08
|
||||
* ------------
|
||||
* | x29 | <- irq_stack_ptr - 0x10
|
||||
* ------------
|
||||
*
|
||||
* where x19 holds a copy of the task stack pointer where the struct pt_regs
|
||||
* from kernel_entry can be found.
|
||||
*
|
||||
*/
|
||||
#define IRQ_STACK_PTR() ((unsigned long)raw_cpu_ptr(irq_stack) + IRQ_STACK_START_SP)
|
||||
|
||||
/*
|
||||
* The offset from irq_stack_ptr where entry.S will store the original
|
||||
* stack pointer. Used by unwind_frame() and dump_backtrace().
|
||||
*/
|
||||
#define IRQ_STACK_TO_TASK_STACK(ptr) (*((unsigned long *)((ptr) - 0x08)))
|
||||
|
||||
extern void set_handle_irq(void (*handle_irq)(struct pt_regs *));
|
||||
|
||||
static inline int nr_legacy_irqs(void)
|
||||
|
|
|
@ -119,6 +119,7 @@ struct pt_regs {
|
|||
u64 syscallno;
|
||||
u64 orig_addr_limit;
|
||||
u64 unused; // maintain 16 byte alignment
|
||||
u64 stackframe[2];
|
||||
};
|
||||
|
||||
#define MAX_REG_OFFSET offsetof(struct pt_regs, pstate)
|
||||
|
|
|
@ -60,4 +60,9 @@ static inline int in_exception_text(unsigned long ptr)
|
|||
return in ? : __in_irqentry_text(ptr);
|
||||
}
|
||||
|
||||
static inline int in_entry_text(unsigned long ptr)
|
||||
{
|
||||
return ptr >= (unsigned long)&__entry_text_start &&
|
||||
ptr < (unsigned long)&__entry_text_end;
|
||||
}
|
||||
#endif
|
||||
|
|
|
@ -75,6 +75,7 @@ int main(void)
|
|||
DEFINE(S_ORIG_X0, offsetof(struct pt_regs, orig_x0));
|
||||
DEFINE(S_SYSCALLNO, offsetof(struct pt_regs, syscallno));
|
||||
DEFINE(S_ORIG_ADDR_LIMIT, offsetof(struct pt_regs, orig_addr_limit));
|
||||
DEFINE(S_STACKFRAME, offsetof(struct pt_regs, stackframe));
|
||||
DEFINE(S_FRAME_SIZE, sizeof(struct pt_regs));
|
||||
BLANK();
|
||||
DEFINE(MM_CONTEXT_ID, offsetof(struct mm_struct, context.id.counter));
|
||||
|
|
|
@ -111,6 +111,18 @@
|
|||
mrs x23, spsr_el1
|
||||
stp lr, x21, [sp, #S_LR]
|
||||
|
||||
/*
|
||||
* In order to be able to dump the contents of struct pt_regs at the
|
||||
* time the exception was taken (in case we attempt to walk the call
|
||||
* stack later), chain it together with the stack frames.
|
||||
*/
|
||||
.if \el == 0
|
||||
stp xzr, xzr, [sp, #S_STACKFRAME]
|
||||
.else
|
||||
stp x29, x22, [sp, #S_STACKFRAME]
|
||||
.endif
|
||||
add x29, sp, #S_STACKFRAME
|
||||
|
||||
#ifdef CONFIG_ARM64_SW_TTBR0_PAN
|
||||
/*
|
||||
* Set the TTBR0 PAN bit in SPSR. When the exception is taken from
|
||||
|
@ -265,14 +277,6 @@ alternative_else_nop_endif
|
|||
|
||||
/* switch to the irq stack */
|
||||
mov sp, x26
|
||||
|
||||
/*
|
||||
* Add a dummy stack frame, this non-standard format is fixed up
|
||||
* by unwind_frame()
|
||||
*/
|
||||
stp x29, x19, [sp, #-16]!
|
||||
mov x29, sp
|
||||
|
||||
9998:
|
||||
.endm
|
||||
|
||||
|
|
|
@ -362,6 +362,9 @@ __primary_switched:
|
|||
ret // to __primary_switch()
|
||||
0:
|
||||
#endif
|
||||
add sp, sp, #16
|
||||
mov x29, #0
|
||||
mov x30, #0
|
||||
b start_kernel
|
||||
ENDPROC(__primary_switched)
|
||||
|
||||
|
@ -617,6 +620,7 @@ __secondary_switched:
|
|||
ldr x2, [x0, #CPU_BOOT_TASK]
|
||||
msr sp_el0, x2
|
||||
mov x29, #0
|
||||
mov x30, #0
|
||||
b secondary_start_kernel
|
||||
ENDPROC(__secondary_switched)
|
||||
|
||||
|
|
|
@ -76,34 +76,13 @@ int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame)
|
|||
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
||||
|
||||
/*
|
||||
* Check whether we are going to walk through from interrupt stack
|
||||
* to task stack.
|
||||
* If we reach the end of the stack - and its an interrupt stack,
|
||||
* unpack the dummy frame to find the original elr.
|
||||
*
|
||||
* Check the frame->fp we read from the bottom of the irq_stack,
|
||||
* and the original task stack pointer are both in current->stack.
|
||||
* Frames created upon entry from EL0 have NULL FP and PC values, so
|
||||
* don't bother reporting these. Frames created by __noreturn functions
|
||||
* might have a valid FP even if PC is bogus, so only terminate where
|
||||
* both are NULL.
|
||||
*/
|
||||
if (frame->sp == IRQ_STACK_PTR()) {
|
||||
struct pt_regs *irq_args;
|
||||
unsigned long orig_sp = IRQ_STACK_TO_TASK_STACK(frame->sp);
|
||||
|
||||
if (object_is_on_stack((void *)orig_sp) &&
|
||||
object_is_on_stack((void *)frame->fp)) {
|
||||
frame->sp = orig_sp;
|
||||
|
||||
/* orig_sp is the saved pt_regs, find the elr */
|
||||
irq_args = (struct pt_regs *)orig_sp;
|
||||
frame->pc = irq_args->pc;
|
||||
} else {
|
||||
/*
|
||||
* This frame has a non-standard format, and we
|
||||
* didn't fix it, because the data looked wrong.
|
||||
* Refuse to output this frame.
|
||||
*/
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
if (!frame->fp && !frame->pc)
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
@ -143,7 +143,6 @@ static void dump_instr(const char *lvl, struct pt_regs *regs)
|
|||
void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
|
||||
{
|
||||
struct stackframe frame;
|
||||
unsigned long irq_stack_ptr;
|
||||
int skip;
|
||||
|
||||
pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
|
||||
|
@ -154,15 +153,6 @@ void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
|
|||
if (!try_get_task_stack(tsk))
|
||||
return;
|
||||
|
||||
/*
|
||||
* Switching between stacks is valid when tracing current and in
|
||||
* non-preemptible context.
|
||||
*/
|
||||
if (tsk == current && !preemptible())
|
||||
irq_stack_ptr = IRQ_STACK_PTR();
|
||||
else
|
||||
irq_stack_ptr = 0;
|
||||
|
||||
if (tsk == current) {
|
||||
frame.fp = (unsigned long)__builtin_frame_address(0);
|
||||
frame.sp = current_stack_pointer;
|
||||
|
@ -182,13 +172,12 @@ void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
|
|||
skip = !!regs;
|
||||
printk("Call trace:\n");
|
||||
while (1) {
|
||||
unsigned long where = frame.pc;
|
||||
unsigned long stack;
|
||||
int ret;
|
||||
|
||||
/* skip until specified stack frame */
|
||||
if (!skip) {
|
||||
dump_backtrace_entry(where);
|
||||
dump_backtrace_entry(frame.pc);
|
||||
} else if (frame.fp == regs->regs[29]) {
|
||||
skip = 0;
|
||||
/*
|
||||
|
@ -203,20 +192,13 @@ void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
|
|||
ret = unwind_frame(tsk, &frame);
|
||||
if (ret < 0)
|
||||
break;
|
||||
stack = frame.sp;
|
||||
if (in_exception_text(where)) {
|
||||
/*
|
||||
* If we switched to the irq_stack before calling this
|
||||
* exception handler, then the pt_regs will be on the
|
||||
* task stack. The easiest way to tell is if the large
|
||||
* pt_regs would overlap with the end of the irq_stack.
|
||||
*/
|
||||
if (stack < irq_stack_ptr &&
|
||||
(stack + sizeof(struct pt_regs)) > irq_stack_ptr)
|
||||
stack = IRQ_STACK_TO_TASK_STACK(irq_stack_ptr);
|
||||
if (in_entry_text(frame.pc)) {
|
||||
stack = frame.fp - offsetof(struct pt_regs, stackframe);
|
||||
|
||||
dump_mem("", "Exception stack", stack,
|
||||
stack + sizeof(struct pt_regs));
|
||||
if (on_task_stack(tsk, stack) ||
|
||||
(tsk == current && !preemptible() && on_irq_stack(stack)))
|
||||
dump_mem("", "Exception stack", stack,
|
||||
stack + sizeof(struct pt_regs));
|
||||
}
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in a new issue