linux-kernel - [PATCH v3 0/4] Make sscanf() stricter

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Message-Id: <20230610204044.3653-1-demi@invisiblethingslab.com>
Date:   Sat, 10 Jun 2023 16:40:40 -0400
From:   Demi Marie Obenour <demi@...isiblethingslab.com>
To:     Hans de Goede <hdegoede@...hat.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Lee Jones <lee@...nel.org>, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Demi Marie Obenour <demi@...isiblethingslab.com>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Subject: [PATCH v3 0/4] Make sscanf() stricter

Roger Pau Monné suggested making xenbus_scanf() stricter instead of
using a custom parser.  Christoph Hellwig asked why the normal vsscanf()
cannot be made stricter.  Richard Weinberger mentioned Linus Torvalds’s
suggestion of using ! to allow overflow.

Changes since v2:

- Better commit messages.
- Fix a compile error in simple_strtoll() (found by 0day bot).
- Fix an uninitialized variable (found by Dan Carpenter).

Changes since v1:

- Better commit messages.
- Use ! to explicitly opt-in to allowing overflow.
- Treat overflow as a conversion failure instead of returning ERANGE.
- Drop the first patch (removal of simple_strtoll()) as it breaks
  bcache.
- Stop skipping spaces in vsscanf() instead of adding a separate
  vsscanf_strict() function.

Demi Marie Obenour (4):
  limits.h: add UCHAR_MAX, SCHAR_MAX, and SCHAR_MIN
  vsscanf(): Integer overflow is a conversion failure
  vsscanf(): do not skip spaces
  Reject NUL bytes in xenstore nodes

 .../hive_isp_css_include/platform_support.h   |  1 -
 drivers/xen/xenbus/xenbus_xs.c                | 17 +++-
 include/linux/limits.h                        |  1 +
 include/linux/mfd/wl1273-core.h               |  3 -
 include/vdso/limits.h                         |  3 +
 lib/vsprintf.c                                | 98 +++++++++++++------
 6 files changed, 86 insertions(+), 37 deletions(-)

-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab