From: Andy Lutomirski <luto@kernel.org>
To: x86@kernel.org, linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org, Borislav Petkov <bp@alien8.de>,
Nadav Amit <nadav.amit@gmail.com>,
Kees Cook <keescook@chromium.org>,
Brian Gerst <brgerst@gmail.com>,
"kernel-hardening@lists.openwall.com"
<kernel-hardening@lists.openwall.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Josh Poimboeuf <jpoimboe@redhat.com>, Jann Horn <jann@thejh.net>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Andy Lutomirski <luto@kernel.org>
Subject: [PATCH v5 09/32] x86/dumpstack: When OOPSing, rewind the stack before do_exit()
Date: Mon, 11 Jul 2016 13:53:42 -0700 [thread overview]
Message-ID: <dac83682fc628d52e8a9167bd17215ba7914bac7.1468270393.git.luto@kernel.org> (raw)
In-Reply-To: <cover.1468270393.git.luto@kernel.org>
In-Reply-To: <cover.1468270393.git.luto@kernel.org>
If we call do_exit() with a clean stack, we greatly reduce the risk of
recursive oopses due to stack overflow in do_exit, and we allow
do_exit to work even if we OOPS from an IST stack. The latter gives
us a much better chance of surviving long enough after we detect a
stack overflow to write out our logs.
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
arch/x86/entry/entry_32.S | 11 +++++++++++
arch/x86/entry/entry_64.S | 11 +++++++++++
arch/x86/kernel/dumpstack.c | 10 +++++++++-
3 files changed, 31 insertions(+), 1 deletion(-)
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 983e5d3a0d27..0b56666e6039 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1153,3 +1153,14 @@ ENTRY(async_page_fault)
jmp error_code
END(async_page_fault)
#endif
+
+ENTRY(rewind_stack_do_exit)
+ /* Prevent any naive code from trying to unwind to our caller. */
+ xorl %ebp, %ebp
+
+ movl PER_CPU_VAR(cpu_current_top_of_stack), %esi
+ leal -TOP_OF_KERNEL_STACK_PADDING-PTREGS_SIZE(%esi), %esp
+
+ call do_exit
+1: jmp 1b
+END(rewind_stack_do_exit)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 9ee0da1807ed..b846875aeea6 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1423,3 +1423,14 @@ ENTRY(ignore_sysret)
mov $-ENOSYS, %eax
sysret
END(ignore_sysret)
+
+ENTRY(rewind_stack_do_exit)
+ /* Prevent any naive code from trying to unwind to our caller. */
+ xorl %ebp, %ebp
+
+ movq PER_CPU_VAR(cpu_current_top_of_stack), %rax
+ leaq -TOP_OF_KERNEL_STACK_PADDING-PTREGS_SIZE(%rax), %rsp
+
+ call do_exit
+1: jmp 1b
+END(rewind_stack_do_exit)
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index ef8017ca5ba9..4eefee06f6fd 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -226,6 +226,8 @@ unsigned long oops_begin(void)
EXPORT_SYMBOL_GPL(oops_begin);
NOKPROBE_SYMBOL(oops_begin);
+void __noreturn rewind_stack_do_exit(int signr);
+
void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
{
if (regs && kexec_should_crash(current))
@@ -247,7 +249,13 @@ void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
panic("Fatal exception in interrupt");
if (panic_on_oops)
panic("Fatal exception");
- do_exit(signr);
+
+ /*
+ * We're not going to return, but we might be on an IST stack or
+ * have very little stack space left. Rewind the stack and kill
+ * the task.
+ */
+ rewind_stack_do_exit(signr);
}
NOKPROBE_SYMBOL(oops_end);
--
2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Andy Lutomirski <luto@kernel.org>
To: x86@kernel.org, linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org, Borislav Petkov <bp@alien8.de>,
Nadav Amit <nadav.amit@gmail.com>,
Kees Cook <keescook@chromium.org>,
Brian Gerst <brgerst@gmail.com>,
"kernel-hardening@lists.openwall.com"
<kernel-hardening@lists.openwall.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Josh Poimboeuf <jpoimboe@redhat.com>, Jann Horn <jann@thejh.net>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Andy Lutomirski <luto@kernel.org>
Subject: [kernel-hardening] [PATCH v5 09/32] x86/dumpstack: When OOPSing, rewind the stack before do_exit()
Date: Mon, 11 Jul 2016 13:53:42 -0700 [thread overview]
Message-ID: <dac83682fc628d52e8a9167bd17215ba7914bac7.1468270393.git.luto@kernel.org> (raw)
In-Reply-To: <cover.1468270393.git.luto@kernel.org>
In-Reply-To: <cover.1468270393.git.luto@kernel.org>
If we call do_exit() with a clean stack, we greatly reduce the risk of
recursive oopses due to stack overflow in do_exit, and we allow
do_exit to work even if we OOPS from an IST stack. The latter gives
us a much better chance of surviving long enough after we detect a
stack overflow to write out our logs.
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
arch/x86/entry/entry_32.S | 11 +++++++++++
arch/x86/entry/entry_64.S | 11 +++++++++++
arch/x86/kernel/dumpstack.c | 10 +++++++++-
3 files changed, 31 insertions(+), 1 deletion(-)
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 983e5d3a0d27..0b56666e6039 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1153,3 +1153,14 @@ ENTRY(async_page_fault)
jmp error_code
END(async_page_fault)
#endif
+
+ENTRY(rewind_stack_do_exit)
+ /* Prevent any naive code from trying to unwind to our caller. */
+ xorl %ebp, %ebp
+
+ movl PER_CPU_VAR(cpu_current_top_of_stack), %esi
+ leal -TOP_OF_KERNEL_STACK_PADDING-PTREGS_SIZE(%esi), %esp
+
+ call do_exit
+1: jmp 1b
+END(rewind_stack_do_exit)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 9ee0da1807ed..b846875aeea6 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1423,3 +1423,14 @@ ENTRY(ignore_sysret)
mov $-ENOSYS, %eax
sysret
END(ignore_sysret)
+
+ENTRY(rewind_stack_do_exit)
+ /* Prevent any naive code from trying to unwind to our caller. */
+ xorl %ebp, %ebp
+
+ movq PER_CPU_VAR(cpu_current_top_of_stack), %rax
+ leaq -TOP_OF_KERNEL_STACK_PADDING-PTREGS_SIZE(%rax), %rsp
+
+ call do_exit
+1: jmp 1b
+END(rewind_stack_do_exit)
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index ef8017ca5ba9..4eefee06f6fd 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -226,6 +226,8 @@ unsigned long oops_begin(void)
EXPORT_SYMBOL_GPL(oops_begin);
NOKPROBE_SYMBOL(oops_begin);
+void __noreturn rewind_stack_do_exit(int signr);
+
void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
{
if (regs && kexec_should_crash(current))
@@ -247,7 +249,13 @@ void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
panic("Fatal exception in interrupt");
if (panic_on_oops)
panic("Fatal exception");
- do_exit(signr);
+
+ /*
+ * We're not going to return, but we might be on an IST stack or
+ * have very little stack space left. Rewind the stack and kill
+ * the task.
+ */
+ rewind_stack_do_exit(signr);
}
NOKPROBE_SYMBOL(oops_end);
--
2.7.4
next prev parent reply other threads:[~2016-07-11 20:54 UTC|newest]
Thread overview: 176+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-11 20:53 [PATCH v5 00/32] virtually mapped stacks and thread_info cleanup Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 01/32] bluetooth: Switch SMP to crypto_cipher_encrypt_one() Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-14 19:10 ` Andy Lutomirski
2016-07-14 19:10 ` [kernel-hardening] " Andy Lutomirski
2016-07-14 19:10 ` Andy Lutomirski
2016-07-14 20:30 ` Marcel Holtmann
2016-07-14 20:30 ` [kernel-hardening] " Marcel Holtmann
2016-07-14 20:30 ` Marcel Holtmann
2016-07-14 20:41 ` David Miller
2016-07-14 20:41 ` [kernel-hardening] " David Miller
2016-07-11 20:53 ` [PATCH v5 02/32] x86/mm/hotplug: Don't remove PGD entries in remove_pagetable() Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 03/32] x86/cpa: In populate_pgd, don't set the pgd entry until it's populated Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-22 4:43 ` [kernel-hardening] " Valdis.Kletnieks
2016-07-22 4:43 ` Valdis.Kletnieks
2016-07-22 5:34 ` [kernel-hardening] " Andy Lutomirski
2016-07-22 5:34 ` Andy Lutomirski
2016-07-22 5:34 ` Andy Lutomirski
2016-07-22 10:18 ` Mike Krinkin
2016-07-22 10:21 ` Ingo Molnar
2016-07-22 18:21 ` Andy Lutomirski
2016-07-22 18:21 ` Andy Lutomirski
2016-07-22 18:31 ` Andy Lutomirski
2016-07-22 18:31 ` Andy Lutomirski
2016-07-22 20:11 ` Ingo Molnar
2016-07-22 20:11 ` Ingo Molnar
2016-07-22 20:11 ` Ingo Molnar
2016-07-23 5:21 ` [kernel-hardening] " Valdis.Kletnieks
2016-07-23 5:21 ` Valdis.Kletnieks
2016-07-23 14:58 ` [kernel-hardening] " Nicolai Stange
2016-07-28 9:26 ` Valdis.Kletnieks
2016-07-28 9:26 ` Valdis.Kletnieks
2016-07-11 20:53 ` [PATCH v5 04/32] x86/mm: Remove kernel_unmap_pages_in_pgd() and efi_cleanup_page_tables() Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 05/32] mm: Track NR_KERNEL_STACK in KiB instead of number of stacks Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 06/32] mm: Fix memcg stack accounting for sub-page stacks Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 07/32] fork: Add generic vmalloced stack support Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 08/32] dma-api: Teach the "DMA-from-stack" check about vmapped stacks Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski [this message]
2016-07-11 20:53 ` [kernel-hardening] [PATCH v5 09/32] x86/dumpstack: When OOPSing, rewind the stack before do_exit() Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 10/32] x86/dumpstack: Honor supplied @regs arg Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 11/32] x86/dumpstack: Try harder to get a call trace on stack overflow Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 12/32] x86/dumpstack/64: Handle faults when printing the "Stack:" part of an OOPS Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 13/32] x86/mm/64: In vmalloc_fault(), use CR3 instead of current->active_mm Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-12 17:51 ` [kernel-hardening] " Dave Hansen
2016-07-12 18:03 ` Andy Lutomirski
2016-07-12 18:03 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 14/32] x86/mm/64: Enable vmapped stacks Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-13 7:53 ` Ingo Molnar
2016-07-13 7:53 ` [kernel-hardening] " Ingo Molnar
2016-07-13 7:53 ` Ingo Molnar
2016-07-13 18:42 ` Andy Lutomirski
2016-07-13 18:42 ` [kernel-hardening] " Andy Lutomirski
2016-07-13 18:42 ` Andy Lutomirski
2016-07-14 8:34 ` Ingo Molnar
2016-07-14 8:34 ` [kernel-hardening] " Ingo Molnar
2016-07-14 8:34 ` Ingo Molnar
2016-07-14 16:51 ` Andy Lutomirski
2016-07-14 16:51 ` [kernel-hardening] " Andy Lutomirski
2016-07-14 16:51 ` Andy Lutomirski
2016-07-14 18:45 ` Ingo Molnar
2016-07-14 18:45 ` [kernel-hardening] " Ingo Molnar
2016-07-14 18:45 ` Ingo Molnar
2016-07-11 20:53 ` [PATCH v5 15/32] x86/mm: Improve stack-overflow #PF handling Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 16/32] x86: Move uaccess_err and sig_on_uaccess_err to thread_struct Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 17/32] x86: Move addr_limit " Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 18/32] signal: Consolidate {TS,TLF}_RESTORE_SIGMASK code Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-12 11:57 ` Brian Gerst
2016-07-12 11:57 ` Brian Gerst
2016-07-12 11:57 ` [kernel-hardening] " Brian Gerst
2016-07-12 11:57 ` [PATCH v5 18/32] signal: Consolidate {TS, TLF}_RESTORE_SIGMASK code Brian Gerst
2016-07-12 11:57 ` [PATCH v5 18/32] signal: Consolidate {TS,TLF}_RESTORE_SIGMASK code Brian Gerst
2016-07-12 11:57 ` Brian Gerst
2016-07-12 11:57 ` Brian Gerst
2016-07-12 23:01 ` Andy Lutomirski
2016-07-12 23:01 ` [kernel-hardening] " Andy Lutomirski
2016-07-12 23:01 ` [PATCH v5 18/32] signal: Consolidate {TS, TLF}_RESTORE_SIGMASK code Andy Lutomirski
2016-07-12 23:01 ` [PATCH v5 18/32] signal: Consolidate {TS,TLF}_RESTORE_SIGMASK code Andy Lutomirski
2016-07-12 23:01 ` Andy Lutomirski
2016-07-12 23:01 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 19/32] x86/smp: Remove stack_smp_processor_id() Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 20/32] x86/smp: Remove unnecessary initialization of thread_info::cpu Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 21/32] x86/asm: Move 'status' from struct thread_info to struct thread_struct Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 22/32] kdb: Use task_cpu() instead of task_thread_info()->cpu Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 23/32] printk: When dumping regs, show the stack, not thread_info Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 24/32] x86/entry: Get rid of pt_regs_to_thread_info() Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 25/32] um: Stop conflating task_struct::stack with thread_info Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:53 ` [PATCH v5 26/32] sched: Allow putting thread_info into task_struct Andy Lutomirski
2016-07-11 20:53 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:53 ` Andy Lutomirski
2016-07-11 20:54 ` [PATCH v5 27/32] x86: Move " Andy Lutomirski
2016-07-11 20:54 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:54 ` Andy Lutomirski
2016-07-11 20:54 ` [PATCH v5 28/32] sched: Add try_get_task_stack() and put_task_stack() Andy Lutomirski
2016-07-11 20:54 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:54 ` Andy Lutomirski
2016-07-11 20:54 ` [PATCH v5 29/32] kthread: to_live_kthread() needs try_get_task_stack() Andy Lutomirski
2016-07-11 20:54 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:54 ` Andy Lutomirski
2016-07-11 20:54 ` [PATCH v5 30/32] x86/dumpstack: Pin the target stack in save_stack_trace_tsk() Andy Lutomirski
2016-07-11 20:54 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:54 ` Andy Lutomirski
2016-07-11 20:54 ` [PATCH v5 31/32] sched: Free the stack early if CONFIG_THREAD_INFO_IN_TASK Andy Lutomirski
2016-07-11 20:54 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:54 ` Andy Lutomirski
2016-07-11 20:54 ` [PATCH v5 32/32] fork: Cache two thread stacks per cpu if CONFIG_VMAP_STACK is set Andy Lutomirski
2016-07-11 20:54 ` [kernel-hardening] " Andy Lutomirski
2016-07-11 20:54 ` Andy Lutomirski
2016-07-12 8:56 ` [PATCH v5 00/32] virtually mapped stacks and thread_info cleanup Herbert Xu
2016-07-12 8:56 ` [kernel-hardening] " Herbert Xu
2016-07-12 8:56 ` Herbert Xu
2016-07-12 8:56 ` Herbert Xu
2016-07-13 8:54 ` Christian Borntraeger
2016-07-13 8:54 ` Christian Borntraeger
2016-07-13 8:54 ` [kernel-hardening] " Christian Borntraeger
2016-07-13 18:36 ` Andy Lutomirski
2016-07-13 18:36 ` Andy Lutomirski
2016-07-13 18:36 ` [kernel-hardening] " Andy Lutomirski
2016-07-13 18:53 ` Christian Borntraeger
2016-07-13 18:53 ` Christian Borntraeger
2016-07-13 18:53 ` [kernel-hardening] " Christian Borntraeger
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