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author | 2023-02-21 18:24:12 -0800 | |
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committer | 2023-02-21 18:24:12 -0800 | |
commit | 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch) | |
tree | cc5c2d0a898769fd59549594fedb3ee6f84e59a0 /arch/x86/mm/dump_pagetables.c | |
download | linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip |
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
Pull networking updates from Jakub Kicinski:
"Core:
- Add dedicated kmem_cache for typical/small skb->head, avoid having
to access struct page at kfree time, and improve memory use.
- Introduce sysctl to set default RPS configuration for new netdevs.
- Define Netlink protocol specification format which can be used to
describe messages used by each family and auto-generate parsers.
Add tools for generating kernel data structures and uAPI headers.
- Expose all net/core sysctls inside netns.
- Remove 4s sleep in netpoll if carrier is instantly detected on
boot.
- Add configurable limit of MDB entries per port, and port-vlan.
- Continue populating drop reasons throughout the stack.
- Retire a handful of legacy Qdiscs and classifiers.
Protocols:
- Support IPv4 big TCP (TSO frames larger than 64kB).
- Add IP_LOCAL_PORT_RANGE socket option, to control local port range
on socket by socket basis.
- Track and report in procfs number of MPTCP sockets used.
- Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
manager.
- IPv6: don't check net.ipv6.route.max_size and rely on garbage
collection to free memory (similarly to IPv4).
- Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).
- ICMP: add per-rate limit counters.
- Add support for user scanning requests in ieee802154.
- Remove static WEP support.
- Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
reporting.
- WiFi 7 EHT channel puncturing support (client & AP).
BPF:
- Add a rbtree data structure following the "next-gen data structure"
precedent set by recently added linked list, that is, by using
kfunc + kptr instead of adding a new BPF map type.
- Expose XDP hints via kfuncs with initial support for RX hash and
timestamp metadata.
- Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
better support decap on GRE tunnel devices not operating in collect
metadata.
- Improve x86 JIT's codegen for PROBE_MEM runtime error checks.
- Remove the need for trace_printk_lock for bpf_trace_printk and
bpf_trace_vprintk helpers.
- Extend libbpf's bpf_tracing.h support for tracing arguments of
kprobes/uprobes and syscall as a special case.
- Significantly reduce the search time for module symbols by
livepatch and BPF.
- Enable cpumasks to be used as kptrs, which is useful for tracing
programs tracking which tasks end up running on which CPUs in
different time intervals.
- Add support for BPF trampoline on s390x and riscv64.
- Add capability to export the XDP features supported by the NIC.
- Add __bpf_kfunc tag for marking kernel functions as kfuncs.
- Add cgroup.memory=nobpf kernel parameter option to disable BPF
memory accounting for container environments.
Netfilter:
- Remove the CLUSTERIP target. It has been marked as obsolete for
years, and we still have WARN splats wrt races of the out-of-band
/proc interface installed by this target.
- Add 'destroy' commands to nf_tables. They are identical to the
existing 'delete' commands, but do not return an error if the
referenced object (set, chain, rule...) did not exist.
Driver API:
- Improve cpumask_local_spread() locality to help NICs set the right
IRQ affinity on AMD platforms.
- Separate C22 and C45 MDIO bus transactions more clearly.
- Introduce new DCB table to control DSCP rewrite on egress.
- Support configuration of Physical Layer Collision Avoidance (PLCA)
Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
shared medium Ethernet.
- Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
preemption of low priority frames by high priority frames.
- Add support for controlling MACSec offload using netlink SET.
- Rework devlink instance refcounts to allow registration and
de-registration under the instance lock. Split the code into
multiple files, drop some of the unnecessarily granular locks and
factor out common parts of netlink operation handling.
- Add TX frame aggregation parameters (for USB drivers).
- Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
messages with notifications for debug.
- Allow offloading of UDP NEW connections via act_ct.
- Add support for per action HW stats in TC.
- Support hardware miss to TC action (continue processing in SW from
a specific point in the action chain).
- Warn if old Wireless Extension user space interface is used with
modern cfg80211/mac80211 drivers. Do not support Wireless
Extensions for Wi-Fi 7 devices at all. Everyone should switch to
using nl80211 interface instead.
- Improve the CAN bit timing configuration. Use extack to return
error messages directly to user space, update the SJW handling,
including the definition of a new default value that will benefit
CAN-FD controllers, by increasing their oscillator tolerance.
New hardware / drivers:
- Ethernet:
- nVidia BlueField-3 support (control traffic driver)
- Ethernet support for imx93 SoCs
- Motorcomm yt8531 gigabit Ethernet PHY
- onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
- Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
- Amlogic gxl MDIO mux
- WiFi:
- RealTek RTL8188EU (rtl8xxxu)
- Qualcomm Wi-Fi 7 devices (ath12k)
- CAN:
- Renesas R-Car V4H
Drivers:
- Bluetooth:
- Set Per Platform Antenna Gain (PPAG) for Intel controllers.
- Ethernet NICs:
- Intel (1G, igc):
- support TSN / Qbv / packet scheduling features of i226 model
- Intel (100G, ice):
- use GNSS subsystem instead of TTY
- multi-buffer XDP support
- extend support for GPIO pins to E823 devices
- nVidia/Mellanox:
- update the shared buffer configuration on PFC commands
- implement PTP adjphase function for HW offset control
- TC support for Geneve and GRE with VF tunnel offload
- more efficient crypto key management method
- multi-port eswitch support
- Netronome/Corigine:
- add DCB IEEE support
- support IPsec offloading for NFP3800
- Freescale/NXP (enetc):
- support XDP_REDIRECT for XDP non-linear buffers
- improve reconfig, avoid link flap and waiting for idle
- support MAC Merge layer
- Other NICs:
- sfc/ef100: add basic devlink support for ef100
- ionic: rx_push mode operation (writing descriptors via MMIO)
- bnxt: use the auxiliary bus abstraction for RDMA
- r8169: disable ASPM and reset bus in case of tx timeout
- cpsw: support QSGMII mode for J721e CPSW9G
- cpts: support pulse-per-second output
- ngbe: add an mdio bus driver
- usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
- r8152: handle devices with FW with NCM support
- amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
- virtio-net: support multi buffer XDP
- virtio/vsock: replace virtio_vsock_pkt with sk_buff
- tsnep: XDP support
- Ethernet high-speed switches:
- nVidia/Mellanox (mlxsw):
- add support for latency TLV (in FW control messages)
- Microchip (sparx5):
- separate explicit and implicit traffic forwarding rules, make
the implicit rules always active
- add support for egress DSCP rewrite
- IS0 VCAP support (Ingress Classification)
- IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
etc.)
- ES2 VCAP support (Egress Access Control)
- support for Per-Stream Filtering and Policing (802.1Q,
8.6.5.1)
- Ethernet embedded switches:
- Marvell (mv88e6xxx):
- add MAB (port auth) offload support
- enable PTP receive for mv88e6390
- NXP (ocelot):
- support MAC Merge layer
- support for the the vsc7512 internal copper phys
- Microchip:
- lan9303: convert to PHYLINK
- lan966x: support TC flower filter statistics
- lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
- lan937x: support Credit Based Shaper configuration
- ksz9477: support Energy Efficient Ethernet
- other:
- qca8k: convert to regmap read/write API, use bulk operations
- rswitch: Improve TX timestamp accuracy
- Intel WiFi (iwlwifi):
- EHT (Wi-Fi 7) rate reporting
- STEP equalizer support: transfer some STEP (connection to radio
on platforms with integrated wifi) related parameters from the
BIOS to the firmware.
- Qualcomm 802.11ax WiFi (ath11k):
- IPQ5018 support
- Fine Timing Measurement (FTM) responder role support
- channel 177 support
- MediaTek WiFi (mt76):
- per-PHY LED support
- mt7996: EHT (Wi-Fi 7) support
- Wireless Ethernet Dispatch (WED) reset support
- switch to using page pool allocator
- RealTek WiFi (rtw89):
- support new version of Bluetooth co-existance
- Mobile:
- rmnet: support TX aggregation"
* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
page_pool: add a comment explaining the fragment counter usage
net: ethtool: fix __ethtool_dev_mm_supported() implementation
ethtool: pse-pd: Fix double word in comments
xsk: add linux/vmalloc.h to xsk.c
sefltests: netdevsim: wait for devlink instance after netns removal
selftest: fib_tests: Always cleanup before exit
net/mlx5e: Align IPsec ASO result memory to be as required by hardware
net/mlx5e: TC, Set CT miss to the specific ct action instance
net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
net/mlx5: Refactor tc miss handling to a single function
net/mlx5: Kconfig: Make tc offload depend on tc skb extension
net/sched: flower: Support hardware miss to tc action
net/sched: flower: Move filter handle initialization earlier
net/sched: cls_api: Support hardware miss to tc action
net/sched: Rename user cookie and act cookie
sfc: fix builds without CONFIG_RTC_LIB
sfc: clean up some inconsistent indentings
net/mlx4_en: Introduce flexible array to silence overflow warning
net: lan966x: Fix possible deadlock inside PTP
net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
...
Diffstat (limited to 'arch/x86/mm/dump_pagetables.c')
-rw-r--r-- | arch/x86/mm/dump_pagetables.c | 471 |
1 files changed, 471 insertions, 0 deletions
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c new file mode 100644 index 000000000..e1b599ecb --- /dev/null +++ b/arch/x86/mm/dump_pagetables.c @@ -0,0 +1,471 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Debug helper to dump the current kernel pagetables of the system + * so that we can see what the various memory ranges are set to. + * + * (C) Copyright 2008 Intel Corporation + * + * Author: Arjan van de Ven <arjan@linux.intel.com> + */ + +#include <linux/debugfs.h> +#include <linux/kasan.h> +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/seq_file.h> +#include <linux/highmem.h> +#include <linux/pci.h> +#include <linux/ptdump.h> + +#include <asm/e820/types.h> + +/* + * The dumper groups pagetable entries of the same type into one, and for + * that it needs to keep some state when walking, and flush this state + * when a "break" in the continuity is found. + */ +struct pg_state { + struct ptdump_state ptdump; + int level; + pgprotval_t current_prot; + pgprotval_t effective_prot; + pgprotval_t prot_levels[5]; + unsigned long start_address; + const struct addr_marker *marker; + unsigned long lines; + bool to_dmesg; + bool check_wx; + unsigned long wx_pages; + struct seq_file *seq; +}; + +struct addr_marker { + unsigned long start_address; + const char *name; + unsigned long max_lines; +}; + +/* Address space markers hints */ + +#ifdef CONFIG_X86_64 + +enum address_markers_idx { + USER_SPACE_NR = 0, + KERNEL_SPACE_NR, +#ifdef CONFIG_MODIFY_LDT_SYSCALL + LDT_NR, +#endif + LOW_KERNEL_NR, + VMALLOC_START_NR, + VMEMMAP_START_NR, +#ifdef CONFIG_KASAN + KASAN_SHADOW_START_NR, + KASAN_SHADOW_END_NR, +#endif + CPU_ENTRY_AREA_NR, +#ifdef CONFIG_X86_ESPFIX64 + ESPFIX_START_NR, +#endif +#ifdef CONFIG_EFI + EFI_END_NR, +#endif + HIGH_KERNEL_NR, + MODULES_VADDR_NR, + MODULES_END_NR, + FIXADDR_START_NR, + END_OF_SPACE_NR, +}; + +static struct addr_marker address_markers[] = { + [USER_SPACE_NR] = { 0, "User Space" }, + [KERNEL_SPACE_NR] = { (1UL << 63), "Kernel Space" }, + [LOW_KERNEL_NR] = { 0UL, "Low Kernel Mapping" }, + [VMALLOC_START_NR] = { 0UL, "vmalloc() Area" }, + [VMEMMAP_START_NR] = { 0UL, "Vmemmap" }, +#ifdef CONFIG_KASAN + /* + * These fields get initialized with the (dynamic) + * KASAN_SHADOW_{START,END} values in pt_dump_init(). + */ + [KASAN_SHADOW_START_NR] = { 0UL, "KASAN shadow" }, + [KASAN_SHADOW_END_NR] = { 0UL, "KASAN shadow end" }, +#endif +#ifdef CONFIG_MODIFY_LDT_SYSCALL + [LDT_NR] = { 0UL, "LDT remap" }, +#endif + [CPU_ENTRY_AREA_NR] = { CPU_ENTRY_AREA_BASE,"CPU entry Area" }, +#ifdef CONFIG_X86_ESPFIX64 + [ESPFIX_START_NR] = { ESPFIX_BASE_ADDR, "ESPfix Area", 16 }, +#endif +#ifdef CONFIG_EFI + [EFI_END_NR] = { EFI_VA_END, "EFI Runtime Services" }, +#endif + [HIGH_KERNEL_NR] = { __START_KERNEL_map, "High Kernel Mapping" }, + [MODULES_VADDR_NR] = { MODULES_VADDR, "Modules" }, + [MODULES_END_NR] = { MODULES_END, "End Modules" }, + [FIXADDR_START_NR] = { FIXADDR_START, "Fixmap Area" }, + [END_OF_SPACE_NR] = { -1, NULL } +}; + +#define INIT_PGD ((pgd_t *) &init_top_pgt) + +#else /* CONFIG_X86_64 */ + +enum address_markers_idx { + USER_SPACE_NR = 0, + KERNEL_SPACE_NR, + VMALLOC_START_NR, + VMALLOC_END_NR, +#ifdef CONFIG_HIGHMEM + PKMAP_BASE_NR, +#endif +#ifdef CONFIG_MODIFY_LDT_SYSCALL + LDT_NR, +#endif + CPU_ENTRY_AREA_NR, + FIXADDR_START_NR, + END_OF_SPACE_NR, +}; + +static struct addr_marker address_markers[] = { + [USER_SPACE_NR] = { 0, "User Space" }, + [KERNEL_SPACE_NR] = { PAGE_OFFSET, "Kernel Mapping" }, + [VMALLOC_START_NR] = { 0UL, "vmalloc() Area" }, + [VMALLOC_END_NR] = { 0UL, "vmalloc() End" }, +#ifdef CONFIG_HIGHMEM + [PKMAP_BASE_NR] = { 0UL, "Persistent kmap() Area" }, +#endif +#ifdef CONFIG_MODIFY_LDT_SYSCALL + [LDT_NR] = { 0UL, "LDT remap" }, +#endif + [CPU_ENTRY_AREA_NR] = { 0UL, "CPU entry area" }, + [FIXADDR_START_NR] = { 0UL, "Fixmap area" }, + [END_OF_SPACE_NR] = { -1, NULL } +}; + +#define INIT_PGD (swapper_pg_dir) + +#endif /* !CONFIG_X86_64 */ + +/* Multipliers for offsets within the PTEs */ +#define PTE_LEVEL_MULT (PAGE_SIZE) +#define PMD_LEVEL_MULT (PTRS_PER_PTE * PTE_LEVEL_MULT) +#define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT) +#define P4D_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT) +#define PGD_LEVEL_MULT (PTRS_PER_P4D * P4D_LEVEL_MULT) + +#define pt_dump_seq_printf(m, to_dmesg, fmt, args...) \ +({ \ + if (to_dmesg) \ + printk(KERN_INFO fmt, ##args); \ + else \ + if (m) \ + seq_printf(m, fmt, ##args); \ +}) + +#define pt_dump_cont_printf(m, to_dmesg, fmt, args...) \ +({ \ + if (to_dmesg) \ + printk(KERN_CONT fmt, ##args); \ + else \ + if (m) \ + seq_printf(m, fmt, ##args); \ +}) + +/* + * Print a readable form of a pgprot_t to the seq_file + */ +static void printk_prot(struct seq_file *m, pgprotval_t pr, int level, bool dmsg) +{ + static const char * const level_name[] = + { "pgd", "p4d", "pud", "pmd", "pte" }; + + if (!(pr & _PAGE_PRESENT)) { + /* Not present */ + pt_dump_cont_printf(m, dmsg, " "); + } else { + if (pr & _PAGE_USER) + pt_dump_cont_printf(m, dmsg, "USR "); + else + pt_dump_cont_printf(m, dmsg, " "); + if (pr & _PAGE_RW) + pt_dump_cont_printf(m, dmsg, "RW "); + else + pt_dump_cont_printf(m, dmsg, "ro "); + if (pr & _PAGE_PWT) + pt_dump_cont_printf(m, dmsg, "PWT "); + else + pt_dump_cont_printf(m, dmsg, " "); + if (pr & _PAGE_PCD) + pt_dump_cont_printf(m, dmsg, "PCD "); + else + pt_dump_cont_printf(m, dmsg, " "); + + /* Bit 7 has a different meaning on level 3 vs 4 */ + if (level <= 3 && pr & _PAGE_PSE) + pt_dump_cont_printf(m, dmsg, "PSE "); + else + pt_dump_cont_printf(m, dmsg, " "); + if ((level == 4 && pr & _PAGE_PAT) || + ((level == 3 || level == 2) && pr & _PAGE_PAT_LARGE)) + pt_dump_cont_printf(m, dmsg, "PAT "); + else + pt_dump_cont_printf(m, dmsg, " "); + if (pr & _PAGE_GLOBAL) + pt_dump_cont_printf(m, dmsg, "GLB "); + else + pt_dump_cont_printf(m, dmsg, " "); + if (pr & _PAGE_NX) + pt_dump_cont_printf(m, dmsg, "NX "); + else + pt_dump_cont_printf(m, dmsg, "x "); + } + pt_dump_cont_printf(m, dmsg, "%s\n", level_name[level]); +} + +static void note_wx(struct pg_state *st, unsigned long addr) +{ + unsigned long npages; + + npages = (addr - st->start_address) / PAGE_SIZE; + +#ifdef CONFIG_PCI_BIOS + /* + * If PCI BIOS is enabled, the PCI BIOS area is forced to WX. + * Inform about it, but avoid the warning. + */ + if (pcibios_enabled && st->start_address >= PAGE_OFFSET + BIOS_BEGIN && + addr <= PAGE_OFFSET + BIOS_END) { + pr_warn_once("x86/mm: PCI BIOS W+X mapping %lu pages\n", npages); + return; + } +#endif + /* Account the WX pages */ + st->wx_pages += npages; + WARN_ONCE(__supported_pte_mask & _PAGE_NX, + "x86/mm: Found insecure W+X mapping at address %pS\n", + (void *)st->start_address); +} + +static void effective_prot(struct ptdump_state *pt_st, int level, u64 val) +{ + struct pg_state *st = container_of(pt_st, struct pg_state, ptdump); + pgprotval_t prot = val & PTE_FLAGS_MASK; + pgprotval_t effective; + + if (level > 0) { + pgprotval_t higher_prot = st->prot_levels[level - 1]; + + effective = (higher_prot & prot & (_PAGE_USER | _PAGE_RW)) | + ((higher_prot | prot) & _PAGE_NX); + } else { + effective = prot; + } + + st->prot_levels[level] = effective; +} + +/* + * This function gets called on a break in a continuous series + * of PTE entries; the next one is different so we need to + * print what we collected so far. + */ +static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level, + u64 val) +{ + struct pg_state *st = container_of(pt_st, struct pg_state, ptdump); + pgprotval_t new_prot, new_eff; + pgprotval_t cur, eff; + static const char units[] = "BKMGTPE"; + struct seq_file *m = st->seq; + + new_prot = val & PTE_FLAGS_MASK; + if (!val) + new_eff = 0; + else + new_eff = st->prot_levels[level]; + + /* + * If we have a "break" in the series, we need to flush the state that + * we have now. "break" is either changing perms, levels or + * address space marker. + */ + cur = st->current_prot; + eff = st->effective_prot; + + if (st->level == -1) { + /* First entry */ + st->current_prot = new_prot; + st->effective_prot = new_eff; + st->level = level; + st->marker = address_markers; + st->lines = 0; + pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n", + st->marker->name); + } else if (new_prot != cur || new_eff != eff || level != st->level || + addr >= st->marker[1].start_address) { + const char *unit = units; + unsigned long delta; + int width = sizeof(unsigned long) * 2; + + if (st->check_wx && (eff & _PAGE_RW) && !(eff & _PAGE_NX)) + note_wx(st, addr); + + /* + * Now print the actual finished series + */ + if (!st->marker->max_lines || + st->lines < st->marker->max_lines) { + pt_dump_seq_printf(m, st->to_dmesg, + "0x%0*lx-0x%0*lx ", + width, st->start_address, + width, addr); + + delta = addr - st->start_address; + while (!(delta & 1023) && unit[1]) { + delta >>= 10; + unit++; + } + pt_dump_cont_printf(m, st->to_dmesg, "%9lu%c ", + delta, *unit); + printk_prot(m, st->current_prot, st->level, + st->to_dmesg); + } + st->lines++; + + /* + * We print markers for special areas of address space, + * such as the start of vmalloc space etc. + * This helps in the interpretation. + */ + if (addr >= st->marker[1].start_address) { + if (st->marker->max_lines && + st->lines > st->marker->max_lines) { + unsigned long nskip = + st->lines - st->marker->max_lines; + pt_dump_seq_printf(m, st->to_dmesg, + "... %lu entr%s skipped ... \n", + nskip, + nskip == 1 ? "y" : "ies"); + } + st->marker++; + st->lines = 0; + pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n", + st->marker->name); + } + + st->start_address = addr; + st->current_prot = new_prot; + st->effective_prot = new_eff; + st->level = level; + } +} + +static void ptdump_walk_pgd_level_core(struct seq_file *m, + struct mm_struct *mm, pgd_t *pgd, + bool checkwx, bool dmesg) +{ + const struct ptdump_range ptdump_ranges[] = { +#ifdef CONFIG_X86_64 + {0, PTRS_PER_PGD * PGD_LEVEL_MULT / 2}, + {GUARD_HOLE_END_ADDR, ~0UL}, +#else + {0, ~0UL}, +#endif + {0, 0} +}; + + struct pg_state st = { + .ptdump = { + .note_page = note_page, + .effective_prot = effective_prot, + .range = ptdump_ranges + }, + .level = -1, + .to_dmesg = dmesg, + .check_wx = checkwx, + .seq = m + }; + + ptdump_walk_pgd(&st.ptdump, mm, pgd); + + if (!checkwx) + return; + if (st.wx_pages) + pr_info("x86/mm: Checked W+X mappings: FAILED, %lu W+X pages found.\n", + st.wx_pages); + else + pr_info("x86/mm: Checked W+X mappings: passed, no W+X pages found.\n"); +} + +void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm) +{ + ptdump_walk_pgd_level_core(m, mm, mm->pgd, false, true); +} + +void ptdump_walk_pgd_level_debugfs(struct seq_file *m, struct mm_struct *mm, + bool user) +{ + pgd_t *pgd = mm->pgd; +#ifdef CONFIG_PAGE_TABLE_ISOLATION + if (user && boot_cpu_has(X86_FEATURE_PTI)) + pgd = kernel_to_user_pgdp(pgd); +#endif + ptdump_walk_pgd_level_core(m, mm, pgd, false, false); +} +EXPORT_SYMBOL_GPL(ptdump_walk_pgd_level_debugfs); + +void ptdump_walk_user_pgd_level_checkwx(void) +{ +#ifdef CONFIG_PAGE_TABLE_ISOLATION + pgd_t *pgd = INIT_PGD; + + if (!(__supported_pte_mask & _PAGE_NX) || + !boot_cpu_has(X86_FEATURE_PTI)) + return; + + pr_info("x86/mm: Checking user space page tables\n"); + pgd = kernel_to_user_pgdp(pgd); + ptdump_walk_pgd_level_core(NULL, &init_mm, pgd, true, false); +#endif +} + +void ptdump_walk_pgd_level_checkwx(void) +{ + ptdump_walk_pgd_level_core(NULL, &init_mm, INIT_PGD, true, false); +} + +static int __init pt_dump_init(void) +{ + /* + * Various markers are not compile-time constants, so assign them + * here. + */ +#ifdef CONFIG_X86_64 + address_markers[LOW_KERNEL_NR].start_address = PAGE_OFFSET; + address_markers[VMALLOC_START_NR].start_address = VMALLOC_START; + address_markers[VMEMMAP_START_NR].start_address = VMEMMAP_START; +#ifdef CONFIG_MODIFY_LDT_SYSCALL + address_markers[LDT_NR].start_address = LDT_BASE_ADDR; +#endif +#ifdef CONFIG_KASAN + address_markers[KASAN_SHADOW_START_NR].start_address = KASAN_SHADOW_START; + address_markers[KASAN_SHADOW_END_NR].start_address = KASAN_SHADOW_END; +#endif +#endif +#ifdef CONFIG_X86_32 + address_markers[VMALLOC_START_NR].start_address = VMALLOC_START; + address_markers[VMALLOC_END_NR].start_address = VMALLOC_END; +# ifdef CONFIG_HIGHMEM + address_markers[PKMAP_BASE_NR].start_address = PKMAP_BASE; +# endif + address_markers[FIXADDR_START_NR].start_address = FIXADDR_START; + address_markers[CPU_ENTRY_AREA_NR].start_address = CPU_ENTRY_AREA_BASE; +# ifdef CONFIG_MODIFY_LDT_SYSCALL + address_markers[LDT_NR].start_address = LDT_BASE_ADDR; +# endif +#endif + return 0; +} +__initcall(pt_dump_init); |