Fork of alistair23 Linux kernel for reMarkable from https://github.com/alistair23/linux
27529c891b
There's not much changes for the tracing system this release. Mostly small clean ups and fixes. The biggest change is to how bprintf works. bprintf is used by trace_printk() to just save the format and args of a printf call, and the formatting is done when the trace buffer is read. This is done to keep the formatting out of the fast path (this was recommended by you). The issue is when arguments are de-referenced. If a pointer is saved, and the format has something like "%*pbl", when the buffer is read, it will de-reference the argument then. The problem is if the data no longer exists. This can cause the kernel to oops. The fix for this was to make these de-reference pointes do the formatting at the time it is called (the fast path), as this guarantees that the data exists (and doesn't change later) -----BEGIN PGP SIGNATURE----- iQHIBAABCgAyFiEEPm6V/WuN2kyArTUe1a05Y9njSUkFAlpzUWIUHHJvc3RlZHRA Z29vZG1pcy5vcmcACgkQ1a05Y9njSUk6FQwAqvrOE8AO9cbwB0bxm82aZj7UyYkG D9w4goPiykcNR31wxvM2jhrQn6uqG04g2YFCZntZvZMmGFyu6y/tDxGNGe0cHmVR 1dZkFcst6IAHybY70cIkAcNNJXFFsccTaVcuniidWYwq2K3z2eqK5s3YfA+ZMr0q nfUvv0cIgdGTduM4SuoKr0ewxb779I0tHhQXUnMTeLOWG3HQhOh5LcjdBk/N4pTj axfXIlx8lkHSPOvvUmpJ/R51v7HzfidibEnUrrx46ng3DV81hFdEhwbVl+GO44fP 9Wq7vRCvTThvTZVCg8gaYsuo3+CPISmlkpdq373bCqnKuGynGmXzkFNzXjDHl8pL GPbji/Gu9kSMZaZoBihleaX4G4UW386nqDC2YlLTe4rx6f8phYLxMOC2/8nZ+A3L JKB4PTWKUSSNCfaPgiT6dv/CeaXalcYtgVJ2xM2jFhoOEyM5jwb0f6tdvXsuj5Fn ZlFNTuKWPn0siQIng7EZan3LmIFkukM5sfVF =bmm/ -----END PGP SIGNATURE----- Merge tag 'trace-v4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing updates from Steven Rostedt: "There's not much changes for the tracing system this release. Mostly small clean ups and fixes. The biggest change is to how bprintf works. bprintf is used by trace_printk() to just save the format and args of a printf call, and the formatting is done when the trace buffer is read. This is done to keep the formatting out of the fast path (this was recommended by you). The issue is when arguments are de-referenced. If a pointer is saved, and the format has something like "%*pbl", when the buffer is read, it will de-reference the argument then. The problem is if the data no longer exists. This can cause the kernel to oops. The fix for this was to make these de-reference pointes do the formatting at the time it is called (the fast path), as this guarantees that the data exists (and doesn't change later)" * tag 'trace-v4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: vsprintf: Do not have bprintf dereference pointers ftrace: Mark function tracer test functions noinline/noclone trace_uprobe: Display correct offset in uprobe_events tracing: Make sure the parsed string always terminates with '\0' tracing: Clear parser->idx if only spaces are read tracing: Detect the string nul character when parsing user input string |
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README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.