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arm64 2nd round of updates for 4.20:

Browse source 
- Fix W+X page (mark RO) allocated by the arm64 kprobes code
 
 - Makefile fix for .i files in out of tree modules
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Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull more arm64 updates from Catalin Marinas:

 - fix W+X page (mark RO) allocated by the arm64 kprobes code

 - Makefile fix for .i files in out of tree modules

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: kprobe: make page to RO mode when allocate it
  arm64: kdump: fix small typo
  arm64: makefile fix build of .i file in external module case
This commit is contained in:
Linus Torvalds 2018-11-03 10:55:23 -07:00
commit 83650fd58a
3 changed files with 23 additions and 8 deletions
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2
arch/arm64/Makefile
View file

@ -134,6 +134,7 @@ vdso_install:
archclean:
$(Q)$(MAKE) $(clean)=$(boot)
ifeq ($(KBUILD_EXTMOD),)
# We need to generate vdso-offsets.h before compiling certain files in kernel/.
# In order to do that, we should use the archprepare target, but we can't since
# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
@ -143,6 +144,7 @@ archclean:
prepare: vdso_prepare
vdso_prepare: prepare0
$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
endif
define archhelp
echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'

2
arch/arm64/kernel/crash_dump.c
View file

@ -58,7 +58,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
/**
* elfcorehdr_read - read from ELF core header
* @buf: buffer where the data is placed
* @csize: number of bytes to read
* @count: number of bytes to read
* @ppos: address in the memory
*
* This function reads @count bytes from elf core header which exists

27
arch/arm64/kernel/probes/kprobes.c
View file

@ -23,7 +23,9 @@
#include <linux/slab.h>
#include <linux/stop_machine.h>
#include <linux/sched/debug.h>
#include <linux/set_memory.h>
#include <linux/stringify.h>
#include <linux/vmalloc.h>
#include <asm/traps.h>
#include <asm/ptrace.h>
#include <asm/cacheflush.h>
@ -42,10 +44,21 @@ DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
static void __kprobes
post_kprobe_handler(struct kprobe_ctlblk *, struct pt_regs *);
static int __kprobes patch_text(kprobe_opcode_t *addr, u32 opcode)
{
void *addrs[1];
u32 insns[1];
addrs[0] = addr;
insns[0] = opcode;
return aarch64_insn_patch_text(addrs, insns, 1);
}
static void __kprobes arch_prepare_ss_slot(struct kprobe *p)
{
/* prepare insn slot */
p->ainsn.api.insn[0] = cpu_to_le32(p->opcode);
patch_text(p->ainsn.api.insn, p->opcode);
flush_icache_range((uintptr_t) (p->ainsn.api.insn),
(uintptr_t) (p->ainsn.api.insn) +
@ -118,15 +131,15 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
return 0;
}
static int __kprobes patch_text(kprobe_opcode_t *addr, u32 opcode)
void *alloc_insn_page(void)
{
void *addrs[1];
u32 insns[1];
void *page;
addrs[0] = (void *)addr;
insns[0] = (u32)opcode;
page = vmalloc_exec(PAGE_SIZE);
if (page)
set_memory_ro((unsigned long)page, 1);
return aarch64_insn_patch_text(addrs, insns, 1);
return page;
}
/* arm kprobe: install breakpoint in text */