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 --- tools/perf/MANIFEST | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 tools/perf/MANIFEST (limited to 'tools/perf/MANIFEST') diff --git a/tools/perf/MANIFEST b/tools/perf/MANIFEST new file mode 100644 index 000000000..34af57b8e --- /dev/null +++ b/tools/perf/MANIFEST @@ -0,0 +1,36 @@ +COPYING +LICENSES/preferred/GPL-2.0 +arch/arm64/tools/gen-sysreg.awk +arch/arm64/tools/syscall_64.tbl +arch/arm64/tools/sysreg +arch/*/include/uapi/asm/bpf_perf_event.h +include/uapi/asm-generic/Kbuild +tools/perf +tools/arch +tools/scripts +tools/build +tools/include +tools/lib/api +tools/lib/bpf +tools/lib/subcmd +tools/lib/perf +tools/lib/argv_split.c +tools/lib/ctype.c +tools/lib/hweight.c +tools/lib/rbtree.c +tools/lib/string.c +tools/lib/symbol +tools/lib/find_bit.c +tools/lib/bitmap.c +tools/lib/list_sort.c +tools/lib/str_error_r.c +tools/lib/vsprintf.c +tools/lib/zalloc.c +scripts/bpf_doc.py +scripts/Kbuild.include +scripts/Makefile.asm-headers +scripts/syscall.tbl +scripts/syscallhdr.sh +tools/bpf/bpftool +kernel/bpf/disasm.c +kernel/bpf/disasm.h -- cgit v1.3.1