2018-01-06 14:13:39 +00:00
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From f2c1440e8f0b728d48ee8ce295f4dfe495949e1f Mon Sep 17 00:00:00 2001
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From: Josh Poimboeuf <jpoimboe@redhat.com>
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Date: Tue, 3 Oct 2017 08:51:43 -0500
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2018-01-06 14:14:30 +00:00
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Subject: [PATCH 047/232] kprobes/x86: Set up frame pointer in kprobe
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2018-01-06 14:13:39 +00:00
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trampoline
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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CVE-2017-5754
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Richard Weinberger saw an unwinder warning when running bcc's opensnoop:
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WARNING: kernel stack frame pointer at ffff99ef4076bea0 in opensnoop:2008 has bad value 0000000000000008
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unwind stack type:0 next_sp: (null) mask:0x2 graph_idx:0
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...
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ffff99ef4076be88: ffff99ef4076bea0 (0xffff99ef4076bea0)
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ffff99ef4076be90: ffffffffac442721 (optimized_callback +0x81/0x90)
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...
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A lockdep stack trace was initiated from inside a kprobe handler, when
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the unwinder noticed a bad frame pointer on the stack. The bad frame
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pointer is related to the fact that the kprobe optprobe trampoline
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doesn't save the frame pointer before calling into optimized_callback().
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Reported-and-tested-by: Richard Weinberger <richard@sigma-star.at>
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Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
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Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
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Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
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Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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Cc: David S . Miller <davem@davemloft.net>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Link: http://lkml.kernel.org/r/7aef2f8ecd75c2f505ef9b80490412262cf4a44c.1507038547.git.jpoimboe@redhat.com
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit ee213fc72fd67d0988525af501534f4cb924d1e9)
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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(cherry picked from commit 0f7d5518c91335584b16c7bed1c54c10b78ea76a)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/kernel/kprobes/common.h | 13 +++++++++++--
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1 file changed, 11 insertions(+), 2 deletions(-)
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diff --git a/arch/x86/kernel/kprobes/common.h b/arch/x86/kernel/kprobes/common.h
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index db2182d63ed0..3fc0f9a794cb 100644
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--- a/arch/x86/kernel/kprobes/common.h
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+++ b/arch/x86/kernel/kprobes/common.h
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@@ -3,6 +3,15 @@
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/* Kprobes and Optprobes common header */
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+#include <asm/asm.h>
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+
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+#ifdef CONFIG_FRAME_POINTER
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+# define SAVE_RBP_STRING " push %" _ASM_BP "\n" \
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+ " mov %" _ASM_SP ", %" _ASM_BP "\n"
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+#else
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+# define SAVE_RBP_STRING " push %" _ASM_BP "\n"
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+#endif
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+
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#ifdef CONFIG_X86_64
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#define SAVE_REGS_STRING \
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/* Skip cs, ip, orig_ax. */ \
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@@ -17,7 +26,7 @@
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" pushq %r10\n" \
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" pushq %r11\n" \
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" pushq %rbx\n" \
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- " pushq %rbp\n" \
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+ SAVE_RBP_STRING \
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" pushq %r12\n" \
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" pushq %r13\n" \
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" pushq %r14\n" \
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@@ -48,7 +57,7 @@
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" pushl %es\n" \
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" pushl %ds\n" \
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" pushl %eax\n" \
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- " pushl %ebp\n" \
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+ SAVE_RBP_STRING \
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" pushl %edi\n" \
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" pushl %esi\n" \
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" pushl %edx\n" \
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--
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2.14.2
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