From 78004e9a87f240df03e2f73120d291763c32e0a7 Mon Sep 17 00:00:00 2001
From: Ali Ahmet Memis <ali@iusegentoo.com>
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 <ali@iusegentoo.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
---
 tools/perf/trace/strace/groups/file   | 20 +++++++++++
 tools/perf/trace/strace/groups/string | 65 +++++++++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+)
 create mode 100644 tools/perf/trace/strace/groups/file
 create mode 100644 tools/perf/trace/strace/groups/string

(limited to 'tools/perf/trace/strace')

diff --git a/tools/perf/trace/strace/groups/file b/tools/perf/trace/strace/groups/file
new file mode 100644
index 000000000..722e25d20
--- /dev/null
+++ b/tools/perf/trace/strace/groups/file
@@ -0,0 +1,20 @@
+access
+chmod
+creat
+execve
+faccessat
+getcwd
+lstat
+mkdir
+open
+openat
+quotactl
+read
+readlink
+rename
+rmdir
+stat
+statfs
+symlink
+unlink
+write
diff --git a/tools/perf/trace/strace/groups/string b/tools/perf/trace/strace/groups/string
new file mode 100644
index 000000000..c87129a3e
--- /dev/null
+++ b/tools/perf/trace/strace/groups/string
@@ -0,0 +1,65 @@
+access
+acct
+add_key
+chdir
+chmod
+chown
+chroot
+creat
+delete_module
+execve
+execveat
+faccessat
+fchmodat
+fchownat
+fgetxattr
+finit_module
+fremovexattr
+fsetxattr
+futimesat
+getxattr
+inotify_add_watch
+lchown
+lgetxattr
+link
+linkat
+listxattr
+llistxattr
+lremovexattr
+lsetxattr
+lstat
+memfd_create
+mkdir
+mkdirat
+mknod
+mknodat
+mq_open
+mq_timedsend
+mq_unlink
+name_to_handle_at
+newfstatat
+open
+openat
+pivot_root
+pwrite64
+quotactl
+readlink
+readlinkat
+removexattr
+rename
+renameat
+renameat2
+request_key
+rmdir
+setxattr
+stat
+statfs
+statx
+swapoff
+swapon
+symlink
+symlinkat
+truncate
+unlink
+unlinkat
+utimensat
-- 
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