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/Documentation/perfconfig.example | 38 +++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 tools/perf/Documentation/perfconfig.example (limited to 'tools/perf/Documentation/perfconfig.example') diff --git a/tools/perf/Documentation/perfconfig.example b/tools/perf/Documentation/perfconfig.example new file mode 100644 index 000000000..2b477c1d1 --- /dev/null +++ b/tools/perf/Documentation/perfconfig.example @@ -0,0 +1,38 @@ +[colors] + + # These were the old defaults + top = red, lightgray + medium = green, lightgray + normal = black, lightgray + selected = lightgray, magenta + jump_arrows = blue, lightgray + addr = magenta, lightgray + +[tui] + + # Defaults if linked with libslang + report = on + annotate = on + top = on + +[buildid] + + # Default, disable using /dev/null + dir = /root/.debug + +[annotate] + + # Defaults + hide_src_code = false + use_offset = true + jump_arrows = true + show_nr_jumps = false + +[report] + + # Defaults + sort-order = comm,dso,symbol + percent-limit = 0 + queue-size = 0 + children = true + group = true -- cgit v1.3.1