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/ntfs/ea.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 fs/ntfs/ea.h (limited to 'fs/ntfs/ea.h') diff --git a/fs/ntfs/ea.h b/fs/ntfs/ea.h new file mode 100644 index 000000000..1f63bd55e --- /dev/null +++ b/fs/ntfs/ea.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#ifndef _LINUX_NTFS_EA_H +#define _LINUX_NTFS_EA_H + +#define NTFS_EA_UID BIT(1) +#define NTFS_EA_GID BIT(2) +#define NTFS_EA_MODE BIT(3) + +extern const struct xattr_handler *const ntfs_xattr_handlers[]; + +int ntfs_ea_set_wsl_not_symlink(struct ntfs_inode *ni, mode_t mode, dev_t dev); +int ntfs_ea_get_wsl_inode(struct inode *inode, dev_t *rdevp, unsigned int flags); +int ntfs_ea_set_wsl_inode(struct inode *inode, dev_t rdev, __le16 *ea_size, + unsigned int flags); +ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size); + +#ifdef CONFIG_NTFS_FS_POSIX_ACL +struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry, + int type); +int ntfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, + struct posix_acl *acl, int type); +int ntfs_init_acl(struct mnt_idmap *idmap, struct inode *inode, + struct inode *dir); +#else +#define ntfs_get_acl NULL +#define ntfs_set_acl NULL +#endif + +#endif /* _LINUX_NTFS_EA_H */ -- cgit v1.3.1