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 --- Documentation/maintainer/configure-git.rst | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 Documentation/maintainer/configure-git.rst (limited to 'Documentation/maintainer/configure-git.rst') diff --git a/Documentation/maintainer/configure-git.rst b/Documentation/maintainer/configure-git.rst new file mode 100644 index 000000000..0c21f203c --- /dev/null +++ b/Documentation/maintainer/configure-git.rst @@ -0,0 +1,30 @@ +Configuring Git +=============== + +This chapter describes maintainer level git configuration. + +Tagged branches used in pull requests (see +Documentation/maintainer/pull-requests.rst) should be signed with the +developers public GPG key. Signed tags can be created by passing +``-u `` to ``git tag``. However, since you would *usually* use the same +key for the project, you can set it in the configuration and use the ``-s`` +flag. To set the default ``key-id`` use:: + + git config user.signingkey "keyname" + +Alternatively, edit your ``.git/config`` or ``~/.gitconfig`` file by hand:: + + [user] + name = Jane Developer + email = jd@domain.org + signingkey = jd@domain.org + +You may need to tell ``git`` to use ``gpg2``:: + + [gpg] + program = /path/to/gpg2 + +You may also like to tell ``gpg`` which ``tty`` to use (add to your shell +rc file):: + + export GPG_TTY=$(tty) -- cgit v1.3.1