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Commit 462e9a35 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm 

Pull ARM fixes from Russell King:
 "A number of ARM fixes:

   - prevent oopses caused by dma_get_sgtable() and declared DMA
     coherent memory

   - fix boot failure on nommu caused by ID_PFR1 access

   - a number of kprobes fixes from Jon Medhurst and Masami Hiramatsu"

* 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 8665/1: nommu: access ID_PFR1 only if CPUID scheme
  ARM: dma-mapping: disallow dma_get_sgtable() for non-kernel managed memory
  arm: kprobes: Align stack to 8-bytes in test code
  arm: kprobes: Fix the return address of multiple kretprobes
  arm: kprobes: Skip single-stepping in recursing path if possible
  arm: kprobes: Allow to handle reentered kprobe on single-stepping
parents 5b50be74 3872fe83

arch/arm/mm/dma-mapping.c

+19 −1
Original line number Diff line number Diff line
@@ -935,13 +935,31 @@ static void arm_coherent_dma_free(struct device *dev, size_t size, void *cpu_add 
	__arm_dma_free(dev, size, cpu_addr, handle, attrs, true);

}



/*

 * The whole dma_get_sgtable() idea is fundamentally unsafe - it seems

 * that the intention is to allow exporting memory allocated via the

 * coherent DMA APIs through the dma_buf API, which only accepts a

 * scattertable.  This presents a couple of problems:

 * 1. Not all memory allocated via the coherent DMA APIs is backed by

 *    a struct page

 * 2. Passing coherent DMA memory into the streaming APIs is not allowed

 *    as we will try to flush the memory through a different alias to that

 *    actually being used (and the flushes are redundant.)

 */

int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,

		 void *cpu_addr, dma_addr_t handle, size_t size,

		 unsigned long attrs)

{

	struct page *page = pfn_to_page(dma_to_pfn(dev, handle));

	unsigned long pfn = dma_to_pfn(dev, handle);

	struct page *page;

	int ret;



	/* If the PFN is not valid, we do not have a struct page */

	if (!pfn_valid(pfn))

		return -ENXIO;



	page = pfn_to_page(pfn);



	ret = sg_alloc_table(sgt, 1, GFP_KERNEL);

	if (unlikely(ret))

		return ret;

arch/arm/mm/nommu.c

+4 −1
Original line number Diff line number Diff line
@@ -303,7 +303,10 @@ static inline void set_vbar(unsigned long val) 
 */

static inline bool security_extensions_enabled(void)

{

	/* Check CPUID Identification Scheme before ID_PFR1 read */

	if ((read_cpuid_id() & 0x000f0000) == 0x000f0000)

		return !!cpuid_feature_extract(CPUID_EXT_PFR1, 4);

	return 0;

}



static unsigned long __init setup_vectors_base(void)

arch/arm/probes/kprobes/core.c

+38 −11
Original line number Diff line number Diff line
@@ -266,11 +266,20 @@ void __kprobes kprobe_handler(struct pt_regs *regs) 
#endif



	if (p) {

		if (cur) {

		if (!p->ainsn.insn_check_cc(regs->ARM_cpsr)) {

			/*

			 * Probe hit but conditional execution check failed,

			 * so just skip the instruction and continue as if

			 * nothing had happened.

			 * In this case, we can skip recursing check too.

			 */

			singlestep_skip(p, regs);

		} else if (cur) {

			/* Kprobe is pending, so we're recursing. */

			switch (kcb->kprobe_status) {

			case KPROBE_HIT_ACTIVE:

			case KPROBE_HIT_SSDONE:

			case KPROBE_HIT_SS:

				/* A pre- or post-handler probe got us here. */

				kprobes_inc_nmissed_count(p);

				save_previous_kprobe(kcb);
@@ -279,11 +288,16 @@ void __kprobes kprobe_handler(struct pt_regs *regs) 
				singlestep(p, regs, kcb);

				restore_previous_kprobe(kcb);

				break;

			case KPROBE_REENTER:

				/* A nested probe was hit in FIQ, it is a BUG */

				pr_warn("Unrecoverable kprobe detected at %p.\n",

					p->addr);

				/* fall through */

			default:

				/* impossible cases */

				BUG();

			}

		} else if (p->ainsn.insn_check_cc(regs->ARM_cpsr)) {

		} else {

			/* Probe hit and conditional execution check ok. */

			set_current_kprobe(p);

			kcb->kprobe_status = KPROBE_HIT_ACTIVE;
@@ -304,13 +318,6 @@ void __kprobes kprobe_handler(struct pt_regs *regs) 
				}

				reset_current_kprobe();

			}

		} else {

			/*

			 * Probe hit but conditional execution check failed,

			 * so just skip the instruction and continue as if

			 * nothing had happened.

			 */

			singlestep_skip(p, regs);

		}

	} else if (cur) {

		/* We probably hit a jprobe.  Call its break handler. */
@@ -434,6 +441,7 @@ static __used __kprobes void *trampoline_handler(struct pt_regs *regs) 
	struct hlist_node *tmp;

	unsigned long flags, orig_ret_address = 0;

	unsigned long trampoline_address = (unsigned long)&kretprobe_trampoline;

	kprobe_opcode_t *correct_ret_addr = NULL;



	INIT_HLIST_HEAD(&empty_rp);

	kretprobe_hash_lock(current, &head, &flags);
@@ -456,14 +464,34 @@ static __used __kprobes void *trampoline_handler(struct pt_regs *regs) 
			/* another task is sharing our hash bucket */

			continue;



		orig_ret_address = (unsigned long)ri->ret_addr;



		if (orig_ret_address != trampoline_address)

			/*

			 * This is the real return address. Any other

			 * instances associated with this task are for

			 * other calls deeper on the call stack

			 */

			break;

	}



	kretprobe_assert(ri, orig_ret_address, trampoline_address);



	correct_ret_addr = ri->ret_addr;

	hlist_for_each_entry_safe(ri, tmp, head, hlist) {

		if (ri->task != current)

			/* another task is sharing our hash bucket */

			continue;



		orig_ret_address = (unsigned long)ri->ret_addr;

		if (ri->rp && ri->rp->handler) {

			__this_cpu_write(current_kprobe, &ri->rp->kp);

			get_kprobe_ctlblk()->kprobe_status = KPROBE_HIT_ACTIVE;

			ri->ret_addr = correct_ret_addr;

			ri->rp->handler(ri, regs);

			__this_cpu_write(current_kprobe, NULL);

		}



		orig_ret_address = (unsigned long)ri->ret_addr;

		recycle_rp_inst(ri, &empty_rp);



		if (orig_ret_address != trampoline_address)
@@ -475,7 +503,6 @@ static __used __kprobes void *trampoline_handler(struct pt_regs *regs) 
			break;

	}



	kretprobe_assert(ri, orig_ret_address, trampoline_address);

	kretprobe_hash_unlock(current, &flags);



	hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) {

arch/arm/probes/kprobes/test-core.c

+8 −3
Original line number Diff line number Diff line
@@ -977,7 +977,10 @@ static void coverage_end(void) 
void __naked __kprobes_test_case_start(void)

{

	__asm__ __volatile__ (

		"stmdb	sp!, {r4-r11}				\n\t"

		"mov	r2, sp					\n\t"

		"bic	r3, r2, #7				\n\t"

		"mov	sp, r3					\n\t"

		"stmdb	sp!, {r2-r11}				\n\t"

		"sub	sp, sp, #"__stringify(TEST_MEMORY_SIZE)"\n\t"

		"bic	r0, lr, #1  @ r0 = inline data		\n\t"

		"mov	r1, sp					\n\t"
@@ -997,7 +1000,8 @@ void __naked __kprobes_test_case_end_32(void) 
		"movne	pc, r0					\n\t"

		"mov	r0, r4					\n\t"

		"add	sp, sp, #"__stringify(TEST_MEMORY_SIZE)"\n\t"

		"ldmia	sp!, {r4-r11}				\n\t"

		"ldmia	sp!, {r2-r11}				\n\t"

		"mov	sp, r2					\n\t"

		"mov	pc, r0					\n\t"

	);

}
@@ -1013,7 +1017,8 @@ void __naked __kprobes_test_case_end_16(void) 
		"bxne	r0					\n\t"

		"mov	r0, r4					\n\t"

		"add	sp, sp, #"__stringify(TEST_MEMORY_SIZE)"\n\t"

		"ldmia	sp!, {r4-r11}				\n\t"

		"ldmia	sp!, {r2-r11}				\n\t"

		"mov	sp, r2					\n\t"

		"bx	r0					\n\t"

	);

}