This is a note to let you know that I've just added the patch titled
MIPS: uprobes: remove incorrect set_orig_insn
to the 4.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-uprobes-remove-incorrect-set_orig_insn.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ddabfa5c2e33f1b495f3e0176de7057850915c0b Mon Sep 17 00:00:00 2001
From: Marcin Nowakowski <marcin.nowakowski@xxxxxxxxxx>
Date: Thu, 22 Sep 2016 15:38:32 +0200
Subject: MIPS: uprobes: remove incorrect set_orig_insn
From: Marcin Nowakowski <marcin.nowakowski@xxxxxxxxxx>
commit ddabfa5c2e33f1b495f3e0176de7057850915c0b upstream.
Generic kernel code implements a weak version of set_orig_insn that
moves cached 'insn' from arch_uprobe to the original code location when
the trap is removed.
MIPS variant used arch_uprobe->orig_inst which was never initialised
properly, so this code only inserted a nop instead of the original
instruction. With that change orig_inst can also be safely removed.
Signed-off-by: Marcin Nowakowski <marcin.nowakowski@xxxxxxxxxx>
Fixes: 40e084a506eb ('MIPS: Add uprobes support.')
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/14299/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/include/asm/uprobes.h | 1 -
arch/mips/kernel/uprobes.c | 18 ------------------
2 files changed, 19 deletions(-)
--- a/arch/mips/include/asm/uprobes.h
+++ b/arch/mips/include/asm/uprobes.h
@@ -36,7 +36,6 @@ struct arch_uprobe {
unsigned long resume_epc;
u32 insn[2];
u32 ixol[2];
- union mips_instruction orig_inst[MAX_UINSN_BYTES / 4];
};
struct arch_uprobe_task {
--- a/arch/mips/kernel/uprobes.c
+++ b/arch/mips/kernel/uprobes.c
@@ -280,24 +280,6 @@ int __weak set_swbp(struct arch_uprobe *
return uprobe_write_opcode(mm, vaddr, UPROBE_SWBP_INSN);
}
-/**
- * set_orig_insn - Restore the original instruction.
- * @mm: the probed process address space.
- * @auprobe: arch specific probepoint information.
- * @vaddr: the virtual address to insert the opcode.
- *
- * For mm @mm, restore the original opcode (opcode) at @vaddr.
- * Return 0 (success) or a negative errno.
- *
- * This overrides the weak version in kernel/events/uprobes.c.
- */
-int set_orig_insn(struct arch_uprobe *auprobe, struct mm_struct *mm,
- unsigned long vaddr)
-{
- return uprobe_write_opcode(mm, vaddr,
- *(uprobe_opcode_t *)&auprobe->orig_inst[0].word);
-}
-
void __weak arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
void *src, unsigned long len)
{
Patches currently in stable-queue which might be from marcin.nowakowski@xxxxxxxxxx are
queue-4.7/mips-uprobes-fix-use-of-uninitialised-variable.patch
queue-4.7/mips-fix-uretprobe-implementation.patch
queue-4.7/mips-uprobes-remove-incorrect-set_orig_insn.patch
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