From: Christoph Hellwig
Sent: 18 February 2022 06:29
...
diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c index 15b058eefc4e..ee117fcf46ed 100644 --- a/arch/x86/kernel/stacktrace.c +++ b/arch/x86/kernel/stacktrace.c @@ -90,7 +90,7 @@ copy_stack_frame(const struct stack_frame_user __user *fp, { int ret; - if (__range_not_ok(fp, sizeof(*frame), TASK_SIZE)) + if (!__access_ok(fp, sizeof(*frame))) return 0;Just switch the __get_user calls below to get_user instead.
Is this worth doing at all? How much userspace code is actually compiled with stack frames? Won't work well for a 32bit process on a 64bit kernel either. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
