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| author | Xie Yuanbin <xieyuanbin1@huawei.com> | 2026-07-28 03:16:42 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2026-08-05 16:15:51 +0100 |
| commit | 1039bffd6ae9c75b42b7d148d6c1106134107b66 (patch) | |
| tree | e8ee4ac80f87e2ad1b6b0c877eccbb62b0915c02 /net/Makefile | |
| download | linux-stable-1039bffd6ae9c75b42b7d148d6c1106134107b66.tar.gz linux-stable-1039bffd6ae9c75b42b7d148d6c1106134107b66.zip | |
ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faultsgrafted
When CONFIG_DEBUG_USER=y, and cmdline "user_debug=31" is set,
a user fault may trigger show_pte() without any lock.
If another thread in the same process concurrently calls munmap(),
the page table pages may be freed while show_pte() is still traversing
them, causing a use-after-free in show_pte().
If CONFIG_ARM_LPAE=y, this may cause a kernel panic if the pages table
of PMD are freed when show_pte() is running.
Acquire mmap_write_lock() around show_pte() for user faults to fix the
contention.
For user faults, additionally restrict that show_pte() is called only
when the addr is a user-space address (addr < TASK_SIZE). This is because
the lock of tsk->mm only protects the virtual memory of user address space,
furthermore, dumping the page tables of a kernel-space address for user
faults is unnecessary and may have security implications.
Keep everything unchanged for kernel faults, because the kernel is
already in the "oops" state, acquiring a lock may risk a deadlock.
Co-developed-by: Qi Xi <xiqi2@huawei.com>
Fixes: 6d021b724481 ("ARM: dump pgd, pmd and pte states on unhandled data abort faults")
Link: https://lore.kernel.org/20260716014022.2823-1-xieyuanbin1@huawei.com
Acked-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Qi Xi <xiqi2@huawei.com>
Signed-off-by: Xie Yuanbin <xieyuanbin1@huawei.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'net/Makefile')
| -rw-r--r-- | net/Makefile | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/net/Makefile b/net/Makefile new file mode 100644 index 000000000..5b2dd7f07 --- /dev/null +++ b/net/Makefile @@ -0,0 +1,77 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the linux networking. +# +# 2 Sep 2000, Christoph Hellwig <hch@infradead.org> +# Rewritten to use lists instead of if-statements. +# + +obj-y := devres.o socket.o core/ + +obj-$(CONFIG_COMPAT) += compat.o + +# LLC has to be linked before the files in net/802/ +obj-$(CONFIG_LLC) += llc/ +obj-y += ethernet/ 802/ sched/ netlink/ bpf/ ethtool/ +obj-$(CONFIG_NETFILTER) += netfilter/ +obj-$(CONFIG_INET) += ipv4/ +obj-$(CONFIG_TLS) += tls/ +obj-$(CONFIG_XFRM) += xfrm/ +obj-$(CONFIG_UNIX) += unix/ +obj-$(CONFIG_INET_PSP) += psp/ +obj-y += ipv6/ +obj-$(CONFIG_PACKET) += packet/ +obj-$(CONFIG_NET_KEY) += key/ +obj-$(CONFIG_BRIDGE) += bridge/ +obj-$(CONFIG_NET_DEVLINK) += devlink/ +obj-y += dsa/ +obj-$(CONFIG_X25) += x25/ +obj-$(CONFIG_LAPB) += lapb/ +obj-$(CONFIG_CAN) += can/ +obj-$(CONFIG_BT) += bluetooth/ +obj-$(CONFIG_SUNRPC) += sunrpc/ +obj-$(CONFIG_AF_RXRPC) += rxrpc/ +obj-$(CONFIG_AF_KCM) += kcm/ +obj-$(CONFIG_STREAM_PARSER) += strparser/ +obj-$(CONFIG_ATM) += atm/ +obj-$(CONFIG_L2TP) += l2tp/ +obj-$(CONFIG_PHONET) += phonet/ +ifneq ($(CONFIG_VLAN_8021Q),) +obj-y += 8021q/ +endif +obj-$(CONFIG_IP_SCTP) += sctp/ +obj-$(CONFIG_RDS) += rds/ +obj-$(CONFIG_WIRELESS) += wireless/ +obj-$(CONFIG_MAC80211) += mac80211/ +obj-$(CONFIG_TIPC) += tipc/ +obj-$(CONFIG_NETLABEL) += netlabel/ +obj-$(CONFIG_IUCV) += iucv/ +obj-$(CONFIG_SMC) += smc/ +obj-$(CONFIG_RFKILL) += rfkill/ +obj-$(CONFIG_NET_9P) += 9p/ +obj-$(CONFIG_DCB) += dcb/ +obj-$(CONFIG_6LOWPAN) += 6lowpan/ +obj-$(CONFIG_IEEE802154) += ieee802154/ +obj-$(CONFIG_MAC802154) += mac802154/ + +obj-$(CONFIG_SYSCTL) += sysctl_net.o +obj-$(CONFIG_DNS_RESOLVER) += dns_resolver/ +obj-$(CONFIG_CEPH_LIB) += ceph/ +obj-$(CONFIG_BATMAN_ADV) += batman-adv/ +obj-$(CONFIG_NFC) += nfc/ +obj-$(CONFIG_PSAMPLE) += psample/ +obj-$(CONFIG_NET_IFE) += ife/ +obj-$(CONFIG_OPENVSWITCH) += openvswitch/ +obj-$(CONFIG_VSOCKETS) += vmw_vsock/ +obj-$(CONFIG_MPLS) += mpls/ +obj-$(CONFIG_NET_NSH) += nsh/ +obj-$(CONFIG_HSR) += hsr/ +obj-$(CONFIG_NET_SWITCHDEV) += switchdev/ +obj-$(CONFIG_NET_L3_MASTER_DEV) += l3mdev/ +obj-$(CONFIG_QRTR) += qrtr/ +obj-$(CONFIG_NET_NCSI) += ncsi/ +obj-$(CONFIG_XDP_SOCKETS) += xdp/ +obj-$(CONFIG_MPTCP) += mptcp/ +obj-$(CONFIG_MCTP) += mctp/ +obj-$(CONFIG_NET_HANDSHAKE) += handshake/ +obj-$(CONFIG_NET_SHAPER) += shaper/ |