From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
To: David Laight <David.Laight@aculab.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Miguel Ojeda <ojeda@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"rust-for-linux@vger.kernel.org" <rust-for-linux@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Gary Guo <gary@garyguo.net>, Alex Gaynor <alex.gaynor@gmail.com>,
Wedson Almeida Filho <wedsonaf@google.com>,
Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Sergey Senozhatsky <senozhatsky@chromium.org>
Subject: Re: [PATCH v4 12/20] vsprintf: add new `%pA` format specifier
Date: Mon, 14 Feb 2022 15:04:47 +0100 [thread overview]
Message-ID: <CANiq72mVsvfdyw8=OtSVbZqm43kjnH2+fUg40_j96BkdM0RtVQ@mail.gmail.com> (raw)
In-Reply-To: <2a7dff8e0efb4142849802357284af51@AcuMS.aculab.com>
On Mon, Feb 14, 2022 at 12:37 PM David Laight <David.Laight@aculab.com> wrote:
>
> Doesn't that stand a reasonable chance of blowing the kernel stack?
>
> vsnprintf() is likely to be on the 'worst case' stack path anyway.
> Anything vaguely like a recursive call, or anything 'stack expensive'
> inside vsnprintf() stands a real chance of overflowing the stack.
There should be no recursion going on, but stack usage could be a
concern depending on what the formatted types attempt to do (thus we
need to be mindful when implementing `Display`) and what the compiler
could possibly generate on a worst case (Gary, bjorn3 et. al. may want
to give details about this).
Cheers,
Miguel
next prev parent reply other threads:[~2022-02-14 14:05 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-12 13:03 [PATCH v4 00/20] Rust support Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 01/20] kallsyms: support "big" kernel symbols Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 02/20] kallsyms: increase maximum kernel symbol length to 512 Miguel Ojeda
2022-02-22 8:19 ` Petr Mladek
2022-02-22 12:45 ` Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 03/20] kallsyms: use the correct buffer size for symbols Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 04/20] rust: add C helpers Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 05/20] rust: add `compiler_builtins` crate Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 06/20] rust: add `alloc` crate Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 07/20] rust: add `build_error` crate Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 08/20] rust: add `macros` crate Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 09/20] rust: add `kernel` crate's `sync` module Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 10/20] rust: add `kernel` crate Miguel Ojeda
2022-02-14 5:27 ` Sergey Senozhatsky
2022-02-14 13:36 ` Miguel Ojeda
2022-02-22 9:06 ` Petr Mladek
2022-02-22 12:48 ` Miguel Ojeda
2022-02-24 12:39 ` Petr Mladek
2022-02-12 13:03 ` [PATCH v4 11/20] rust: export generated symbols Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 12/20] vsprintf: add new `%pA` format specifier Miguel Ojeda
2022-02-14 10:18 ` Andy Shevchenko
2022-02-14 10:52 ` Rasmus Villemoes
2022-02-14 11:36 ` David Laight
2022-02-14 14:04 ` Miguel Ojeda [this message]
2022-02-14 12:12 ` Miguel Ojeda
2022-02-22 9:29 ` Petr Mladek
2022-02-22 10:35 ` Rasmus Villemoes
2022-02-24 9:55 ` Petr Mladek
2022-02-14 12:27 ` Miguel Ojeda
2022-02-14 13:54 ` Andy Shevchenko
2022-02-14 14:56 ` Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 13/20] scripts: add `generate_rust_analyzer.py` Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 14/20] scripts: decode_stacktrace: demangle Rust symbols Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 15/20] docs: add Rust documentation Miguel Ojeda
2022-02-14 10:47 ` Akira Yokosawa
2022-02-14 12:44 ` Miguel Ojeda
2022-02-16 13:37 ` Akira Yokosawa
2022-02-16 14:02 ` Miguel Ojeda
2022-03-17 8:19 ` Miguel Ojeda
2022-03-17 14:50 ` Akira Yokosawa
2022-03-18 13:12 ` Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 16/20] Kbuild: add Rust support Miguel Ojeda
2022-02-12 14:16 ` Russell King (Oracle)
2022-02-12 15:47 ` Miguel Ojeda
2022-02-12 16:18 ` Russell King (Oracle)
2022-02-12 18:32 ` Miguel Ojeda
2022-02-12 18:27 ` John Paul Adrian Glaubitz
2022-02-12 18:57 ` Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 17/20] samples: add Rust examples Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 18/20] MAINTAINERS: Rust Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 19/20] [RFC] drivers: gpio: PrimeCell PL061 in Rust Miguel Ojeda
2022-02-12 13:03 ` [PATCH v4 20/20] [RFC] drivers: android: Binder IPC " Miguel Ojeda
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