From 78004e9a87f240df03e2f73120d291763c32e0a7 Mon Sep 17 00:00:00 2001 From: Ali Ahmet Memis Date: Fri, 21 Aug 2026 01:45:27 +0000 Subject: openrisc: fix arbitrary kernel memory access via or1k_atomic syscall sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user pointers, v1 and v2, and swaps the words they point to in hand-written assembly. l.lwz r29,0(r4) l.lwz r27,0(r5) l.sw 0(r4),r27 l.sw 0(r5),r29 The pointers are not checked with access_ok(). The four memory accesses also have no exception table entries. A caller passes a kernel address as either pointer, and the syscall reads from and writes to it directly. This gives an unprivileged process a kernel read/write primitive. It overwrites kernel data such as the sys_call_table, gaining code execution in kernel context. Check both pointers before entering the critical section. Add fixups for the four memory accesses so faults on valid but unmapped user addresses return -EFAULT. [shorne@gmail.com: fix comment style] Fixes: 9d02a4283e9c ("OpenRISC: Boot code") Cc: stable@vger.kernel.org Signed-off-by: Ali Ahmet Memis Signed-off-by: Stafford Horne --- net/ceph/Kconfig | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 net/ceph/Kconfig (limited to 'net/ceph/Kconfig') diff --git a/net/ceph/Kconfig b/net/ceph/Kconfig new file mode 100644 index 000000000..7e2528cde --- /dev/null +++ b/net/ceph/Kconfig @@ -0,0 +1,47 @@ +# SPDX-License-Identifier: GPL-2.0-only +config CEPH_LIB + tristate "Ceph core library" + depends on INET + select CRC32 + select CRYPTO_AES + select CRYPTO_CBC + select CRYPTO_GCM + select CRYPTO_KRB5 + select CRYPTO_LIB_SHA256 + select CRYPTO + select KEYS + default n + help + Choose Y or M here to include cephlib, which provides the + common functionality to both the Ceph filesystem and + to the rados block device (rbd). + + More information at https://ceph.io/. + + If unsure, say N. + +config CEPH_LIB_PRETTYDEBUG + bool "Include file:line in ceph debug output" + depends on CEPH_LIB + default n + help + If you say Y here, debug output will include a filename and + line to aid debugging. This increases kernel size and slows + execution slightly when debug call sites are enabled (e.g., + via CONFIG_DYNAMIC_DEBUG). + + If unsure, say N. + +config CEPH_LIB_USE_DNS_RESOLVER + bool "Use in-kernel support for DNS lookup" + depends on CEPH_LIB + select DNS_RESOLVER + default n + help + If you say Y here, hostnames (e.g. monitor addresses) will + be resolved using the CONFIG_DNS_RESOLVER facility. + + For information on how to use CONFIG_DNS_RESOLVER consult + Documentation/networking/dns_resolver.rst + + If unsure, say N. -- cgit v1.3.1