linux-kernel - Re: [PATCH v4 14/16] modules: Support extended MODVERSIONS info

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240925230000.GA3176650@google.com>
Date: Wed, 25 Sep 2024 23:00:00 +0000
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Matthew Maurer <mmaurer@...gle.com>
Cc: masahiroy@...nel.org, ndesaulniers@...gle.com, ojeda@...nel.org,
	gary@...yguo.net, mcgrof@...nel.org,
	Michael Ellerman <mpe@...erman.id.au>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Benjamin Gray <bgray@...ux.ibm.com>,
	Naveen N Rao <naveen@...nel.org>, rust-for-linux@...r.kernel.org,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	neal@...pa.dev, marcan@...can.st, j@...nau.net,
	asahi@...ts.linux.dev, Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Petr Pavlu <petr.pavlu@...e.com>,
	Daniel Gomez <da.gomez@...sung.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	linuxppc-dev@...ts.ozlabs.org, linux-modules@...r.kernel.org
Subject: Re: [PATCH v4 14/16] modules: Support extended MODVERSIONS info

Hi Matt,

On Tue, Sep 24, 2024 at 09:19:56PM +0000, Matthew Maurer wrote:
> +static void dedotify_ext_version_names(char *str_seq, unsigned long size)
> +{
> +	unsigned long out = 0;
> +	unsigned long in;
> +	char last = '\0';
> +
> +	for (in = 0; in < size; in++) {
> +		if (last == '\0')
> +			/* Skip one leading dot */
> +			if (str_seq[in] == '.')
> +				in++;

Thanks for addressing Michael's comment, this looks correct to me.

Nit: might be cleaner in a single if statement though:

	/* Skip one leading dot */
	if (last == '\0' && str_seq[in] == '.')
		in++;

> +void modversion_ext_start(const struct load_info *info,
> +			  struct modversion_info_ext *start)
> +{
> +	unsigned int crc_idx = info->index.vers_ext_crc;
> +	unsigned int name_idx = info->index.vers_ext_name;
> +	Elf_Shdr *sechdrs = info->sechdrs;
> +
> +	/*
> +	 * Both of these fields are needed for this to be useful
> +	 * Any future fields should be initialized to NULL if absent.
> +	 */
> +	if ((crc_idx == 0) || (name_idx == 0))
> +		start->remaining = 0;
> +
> +	start->crc = (const s32 *)sechdrs[crc_idx].sh_addr;
> +	start->name = (const char *)sechdrs[name_idx].sh_addr;
> +	start->remaining = sechdrs[crc_idx].sh_size / sizeof(*start->crc);
> +}

This looks unchanged from v3, so I think my comment from there
still applies:

https://lore.kernel.org/lkml/CABCJKufJK0WO92wnW09VTLqZk0ODxhuKQG=HbKE-va0urJU1Vg@mail.gmail.com/

Sami