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 --- fs/ceph/cache.h | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 fs/ceph/cache.h (limited to 'fs/ceph/cache.h') diff --git a/fs/ceph/cache.h b/fs/ceph/cache.h new file mode 100644 index 000000000..20efac020 --- /dev/null +++ b/fs/ceph/cache.h @@ -0,0 +1,117 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Ceph cache definitions. + * + * Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved. + * Written by Milosz Tanski (milosz@adfin.com) + */ + +#ifndef _CEPH_CACHE_H +#define _CEPH_CACHE_H + +#include + +#ifdef CONFIG_CEPH_FSCACHE +#include + +int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc); +void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc); + +void ceph_fscache_register_inode_cookie(struct inode *inode); +void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci); + +void ceph_fscache_use_cookie(struct inode *inode, bool will_modify); +void ceph_fscache_unuse_cookie(struct inode *inode, bool update); + +void ceph_fscache_update(struct inode *inode); +void ceph_fscache_invalidate(struct inode *inode, bool dio_write); + +static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci) +{ + return netfs_i_cookie(&ci->netfs); +} + +static inline void ceph_fscache_resize(struct inode *inode, loff_t to) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct fscache_cookie *cookie = ceph_fscache_cookie(ci); + + if (cookie) { + ceph_fscache_use_cookie(inode, true); + fscache_resize_cookie(cookie, to); + ceph_fscache_unuse_cookie(inode, true); + } +} + +static inline int ceph_fscache_unpin_writeback(struct inode *inode, + struct writeback_control *wbc) +{ + return netfs_unpin_writeback(inode, wbc); +} + +#define ceph_fscache_dirty_folio netfs_dirty_folio + +static inline bool ceph_is_cache_enabled(struct inode *inode) +{ + return fscache_cookie_enabled(ceph_fscache_cookie(ceph_inode(inode))); +} + +#else /* CONFIG_CEPH_FSCACHE */ +static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc, + struct fs_context *fc) +{ + return 0; +} + +static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc) +{ +} + +static inline void ceph_fscache_register_inode_cookie(struct inode *inode) +{ +} + +static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci) +{ +} + +static inline void ceph_fscache_use_cookie(struct inode *inode, bool will_modify) +{ +} + +static inline void ceph_fscache_unuse_cookie(struct inode *inode, bool update) +{ +} + +static inline void ceph_fscache_update(struct inode *inode) +{ +} + +static inline void ceph_fscache_invalidate(struct inode *inode, bool dio_write) +{ +} + +static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci) +{ + return NULL; +} + +static inline void ceph_fscache_resize(struct inode *inode, loff_t to) +{ +} + +static inline int ceph_fscache_unpin_writeback(struct inode *inode, + struct writeback_control *wbc) +{ + return 0; +} + +#define ceph_fscache_dirty_folio filemap_dirty_folio + +static inline bool ceph_is_cache_enabled(struct inode *inode) +{ + return false; +} +#endif /* CONFIG_CEPH_FSCACHE */ + +#endif -- cgit v1.3.1