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 --- rust/syn/export.rs | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 rust/syn/export.rs (limited to 'rust/syn/export.rs') diff --git a/rust/syn/export.rs b/rust/syn/export.rs new file mode 100644 index 000000000..05dad324b --- /dev/null +++ b/rust/syn/export.rs @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: Apache-2.0 OR MIT + +#[doc(hidden)] +pub use std::clone::Clone; +#[doc(hidden)] +pub use std::cmp::{Eq, PartialEq}; +#[doc(hidden)] +pub use std::concat; +#[doc(hidden)] +pub use std::default::Default; +#[doc(hidden)] +pub use std::fmt::Debug; +#[doc(hidden)] +pub use std::hash::{Hash, Hasher}; +#[doc(hidden)] +pub use std::marker::Copy; +#[doc(hidden)] +pub use std::option::Option::{None, Some}; +#[doc(hidden)] +pub use std::result::Result::{Err, Ok}; +#[doc(hidden)] +pub use std::stringify; + +#[doc(hidden)] +pub type Formatter<'a> = std::fmt::Formatter<'a>; +#[doc(hidden)] +pub type FmtResult = std::fmt::Result; + +#[doc(hidden)] +pub type bool = std::primitive::bool; +#[doc(hidden)] +pub type str = std::primitive::str; + +#[cfg(feature = "printing")] +#[doc(hidden)] +pub use quote; + +#[doc(hidden)] +pub type Span = proc_macro2::Span; +#[doc(hidden)] +pub type TokenStream2 = proc_macro2::TokenStream; + +#[cfg(feature = "parsing")] +#[doc(hidden)] +pub use crate::group::{parse_braces, parse_brackets, parse_parens}; + +#[doc(hidden)] +pub use crate::span::IntoSpans; + +#[cfg(all(feature = "parsing", feature = "printing"))] +#[doc(hidden)] +pub use crate::parse_quote::parse as parse_quote; + +#[cfg(feature = "parsing")] +#[doc(hidden)] +pub use crate::token::parsing::{peek_punct, punct as parse_punct}; + +#[cfg(feature = "printing")] +#[doc(hidden)] +pub use crate::token::printing::punct as print_punct; + +#[cfg(feature = "parsing")] +#[doc(hidden)] +pub use crate::token::private::CustomToken; + +#[cfg(feature = "proc-macro")] +#[doc(hidden)] +pub type TokenStream = proc_macro::TokenStream; + +#[cfg(feature = "printing")] +#[doc(hidden)] +pub use quote::{ToTokens, TokenStreamExt}; + +#[doc(hidden)] +pub struct private(pub(crate) ()); -- cgit v1.3.1