From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Mark Rutland <mark.rutland@arm.com>,
Kristina Martsenko <kristina.martsenko@arm.com>,
Will Deacon <will.deacon@arm.com>,
Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH 4.9 19/62] arm64: mm: print out correct page table entries
Date: Mon, 6 May 2019 16:32:50 +0200 [thread overview]
Message-ID: <20190506143052.725394517@linuxfoundation.org> (raw)
In-Reply-To: <20190506143051.102535767@linuxfoundation.org>
From: Kristina Martsenko <kristina.martsenko@arm.com>
commit 67ce16ec15ce9d97d3d85e72beabbc5d7017193e upstream.
When we take a fault that can't be handled, we print out the page table
entries associated with the faulting address. In some cases we currently
print out the wrong entries. For a faulting TTBR1 address, we sometimes
print out TTBR0 table entries instead, and for a faulting TTBR0 address
we sometimes print out TTBR1 table entries. Fix this by choosing the
tables based on the faulting address.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
[will: zero-extend addrs to 64-bit, don't walk swapper w/ TTBR0 addr]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/arm64/include/asm/system_misc.h | 2 -
arch/arm64/mm/fault.c | 36 ++++++++++++++++++++++++-----------
2 files changed, 26 insertions(+), 12 deletions(-)
--- a/arch/arm64/include/asm/system_misc.h
+++ b/arch/arm64/include/asm/system_misc.h
@@ -40,7 +40,7 @@ void hook_debug_fault_code(int nr, int (
int sig, int code, const char *name);
struct mm_struct;
-extern void show_pte(struct mm_struct *mm, unsigned long addr);
+extern void show_pte(unsigned long addr);
extern void __show_regs(struct pt_regs *);
extern void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -79,18 +79,33 @@ static inline int notify_page_fault(stru
#endif
/*
- * Dump out the page tables associated with 'addr' in mm 'mm'.
+ * Dump out the page tables associated with 'addr' in the currently active mm.
*/
-void show_pte(struct mm_struct *mm, unsigned long addr)
+void show_pte(unsigned long addr)
{
+ struct mm_struct *mm;
pgd_t *pgd;
- if (!mm)
+ if (addr < TASK_SIZE) {
+ /* TTBR0 */
+ mm = current->active_mm;
+ if (mm == &init_mm) {
+ pr_alert("[%016lx] user address but active_mm is swapper\n",
+ addr);
+ return;
+ }
+ } else if (addr >= VA_START) {
+ /* TTBR1 */
mm = &init_mm;
+ } else {
+ pr_alert("[%016lx] address between user and kernel address ranges\n",
+ addr);
+ return;
+ }
pr_alert("pgd = %p\n", mm->pgd);
pgd = pgd_offset(mm, addr);
- pr_alert("[%08lx] *pgd=%016llx", addr, pgd_val(*pgd));
+ pr_alert("[%016lx] *pgd=%016llx", addr, pgd_val(*pgd));
do {
pud_t *pud;
@@ -176,8 +191,8 @@ static bool is_el1_instruction_abort(uns
/*
* The kernel tried to access some page that wasn't present.
*/
-static void __do_kernel_fault(struct mm_struct *mm, unsigned long addr,
- unsigned int esr, struct pt_regs *regs)
+static void __do_kernel_fault(unsigned long addr, unsigned int esr,
+ struct pt_regs *regs)
{
/*
* Are we prepared to handle this kernel fault?
@@ -194,7 +209,7 @@ static void __do_kernel_fault(struct mm_
(addr < PAGE_SIZE) ? "NULL pointer dereference" :
"paging request", addr);
- show_pte(mm, addr);
+ show_pte(addr);
die("Oops", regs, esr);
bust_spinlocks(0);
do_exit(SIGKILL);
@@ -216,7 +231,7 @@ static void __do_user_fault(struct task_
pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
tsk->comm, task_pid_nr(tsk), inf->name, sig,
addr, esr);
- show_pte(tsk->mm, addr);
+ show_pte(addr);
show_regs(regs);
}
@@ -232,7 +247,6 @@ static void __do_user_fault(struct task_
static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *regs)
{
struct task_struct *tsk = current;
- struct mm_struct *mm = tsk->active_mm;
const struct fault_info *inf;
/*
@@ -243,7 +257,7 @@ static void do_bad_area(unsigned long ad
inf = esr_to_fault_info(esr);
__do_user_fault(tsk, addr, esr, inf->sig, inf->code, regs);
} else
- __do_kernel_fault(mm, addr, esr, regs);
+ __do_kernel_fault(addr, esr, regs);
}
#define VM_FAULT_BADMAP 0x010000
@@ -454,7 +468,7 @@ retry:
return 0;
no_context:
- __do_kernel_fault(mm, addr, esr, regs);
+ __do_kernel_fault(addr, esr, regs);
return 0;
}
next prev parent reply other threads:[~2019-05-06 14:47 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-06 14:32 [PATCH 4.9 00/62] 4.9.174-stable review Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 01/62] ALSA: line6: use dynamic buffers Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 02/62] ipv4: ip_do_fragment: Preserve skb_iif during fragmentation Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 03/62] ipv6/flowlabel: wait rcu grace period before put_pid() Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 04/62] ipv6: invert flowlabel sharing check in process and user mode Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 05/62] packet: validate msg_namelen in send directly Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 06/62] bnxt_en: Improve multicast address setup logic Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 07/62] net: phy: marvell: Fix buffer overrun with stats counters Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 08/62] x86/suspend: fix false positive KASAN warning on suspend/resume Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 09/62] kasan: turn on -fsanitize-address-use-after-scope Greg Kroah-Hartman
2019-05-06 14:55 ` Andrey Ryabinin
2019-05-06 15:10 ` Greg Kroah-Hartman
2019-05-06 15:36 ` Andrey Ryabinin
2019-05-06 15:42 ` Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 10/62] kasan: rework Kconfig settings Greg Kroah-Hartman
2019-05-06 14:58 ` Andrey Ryabinin
2019-05-06 15:42 ` Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 11/62] mm/kasan: Switch to using __pa_symbol and lm_alias Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 12/62] x86/unwind: Disable KASAN checks for non-current tasks Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 13/62] arm64: kasan: avoid bad virt_to_pfn() Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 14/62] kasan: add a prototype of task_struct to avoid warning Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 15/62] kasan: avoid -Wmaybe-uninitialized warning Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 16/62] kasan: remove redundant initialization of variable real_size Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 17/62] arm64: proc: Set PTE_NG for table entries to avoid traversing them twice Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 18/62] kasan: prevent compiler from optimizing away memset in tests Greg Kroah-Hartman
2019-05-06 14:32 ` Greg Kroah-Hartman [this message]
2019-05-06 14:32 ` [PATCH 4.9 20/62] arm64: mm: dont print out page table entries on EL0 faults Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 21/62] caif: reduce stack size with KASAN Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 22/62] USB: yurex: Fix protection fault after device removal Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 23/62] USB: w1 ds2490: Fix bug caused by improper use of altsetting array Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 24/62] usb: usbip: fix isoc packet num validation in get_pipe Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 25/62] USB: core: Fix unterminated string returned by usb_string() Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 26/62] USB: core: Fix bug caused by duplicate interface PM usage counter Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 27/62] nvme-loop: init nvmet_ctrl fatal_err_work when allocate Greg Kroah-Hartman
2019-05-06 14:32 ` [PATCH 4.9 28/62] HID: logitech: check the return value of create_singlethread_workqueue Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 29/62] HID: debug: fix race condition with between rdesc_show() and device removal Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 30/62] rtc: sh: Fix invalid alarm warning for non-enabled alarm Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 31/62] batman-adv: Reduce claim hash refcnt only for removed entry Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 32/62] batman-adv: Reduce tt_local " Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 33/62] batman-adv: Reduce tt_global " Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 34/62] igb: Fix WARN_ONCE on runtime suspend Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 35/62] net/mlx5: E-Switch, Fix esw manager vport indication for more vport commands Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 36/62] bonding: show full hw address in sysfs for slave entries Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 37/62] net: stmmac: dont overwrite discard_frame status Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 38/62] net: stmmac: fix dropping of multi-descriptor RX frames Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 39/62] net: stmmac: dont log oversized frames Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 40/62] jffs2: fix use-after-free on symlink traversal Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 41/62] debugfs: " Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 42/62] rtc: da9063: set uie_unsupported when relevant Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 43/62] vfio/pci: use correct format characters Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 44/62] scsi: core: add new RDAC LENOVO/DE_Series device Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 45/62] scsi: storvsc: Fix calculation of sub-channel count Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 46/62] net: hns: fix KASAN: use-after-free in hns_nic_net_xmit_hw() Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 47/62] net: hns: Use NAPI_POLL_WEIGHT for hns driver Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 48/62] net: hns: Fix WARNING when remove HNS driver with SMMU enabled Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 49/62] hugetlbfs: fix memory leak for resv_map Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 50/62] sh: fix multiple function definition build errors Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 51/62] xsysace: Fix error handling in ace_setup Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 52/62] ARM: orion: dont use using 64-bit DMA masks Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 53/62] ARM: iop: " Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 54/62] perf/x86/amd: Update generic hardware cache events for Family 17h Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 55/62] staging: iio: adt7316: allow adt751x to use internal vref for all dacs Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 56/62] staging: iio: adt7316: fix the dac read calculation Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 57/62] staging: iio: adt7316: fix the dac write calculation Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 58/62] scsi: RDMA/srpt: Fix a credit leak for aborted commands Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 59/62] Input: snvs_pwrkey - initialize necessary driver data before enabling IRQ Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 60/62] selinux: never allow relabeling on context mounts Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 61/62] x86/mce: Improve error message when kernel cannot recover, p2 Greg Kroah-Hartman
2019-05-06 14:33 ` [PATCH 4.9 62/62] media: v4l2: i2c: ov7670: Fix PLL bypass register values Greg Kroah-Hartman
2019-05-07 8:12 ` [PATCH 4.9 00/62] 4.9.174-stable review Naresh Kamboju
2019-05-07 12:44 ` Jon Hunter
2019-05-07 18:38 ` Guenter Roeck
2019-05-07 20:34 ` shuah
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