From: "Philippe Mathieu-Daudé" <philmd@redhat.com>
To: "Alex Bennée" <alex.bennee@linaro.org>, qemu-devel@nongnu.org
Subject: Re: [PATCH v1 1/7] elf-ops: bail out if we have no function symbols
Date: Fri, 27 Mar 2020 11:53:53 +0100 [thread overview]
Message-ID: <0aa311c7-ae89-6dc2-d1ef-514a75bd0c6e@redhat.com> (raw)
In-Reply-To: <20200327094945.23768-2-alex.bennee@linaro.org>
On 3/27/20 10:49 AM, Alex Bennée wrote:
> It's perfectly possible to have no function symbols in your elf file
> and if we do the undefined behaviour sanitizer rightly complains about
> us passing NULL to qsort. Check nsyms before we go ahead.
>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> ---
> include/hw/elf_ops.h | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/include/hw/elf_ops.h b/include/hw/elf_ops.h
> index a1411bfcab6..b5d4074d1e3 100644
> --- a/include/hw/elf_ops.h
> +++ b/include/hw/elf_ops.h
> @@ -170,8 +170,13 @@ static int glue(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab,
> }
> i++;
> }
> - syms = g_realloc(syms, nsyms * sizeof(*syms));
>
> + /* check we have symbols left */
> + if (nsyms == 0) {
> + goto fail;
> + }
> +
> + syms = g_realloc(syms, nsyms * sizeof(*syms));
> qsort(syms, nsyms, sizeof(*syms), glue(symcmp, SZ));
> for (i = 0; i < nsyms - 1; i++) {
> if (syms[i].st_size == 0) {
>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
next prev parent reply other threads:[~2020-03-27 10:54 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-27 9:49 [PATCH for 5.0 v1 0/7] A selection of sanitiser fixes Alex Bennée
2020-03-27 9:49 ` [PATCH v1 1/7] elf-ops: bail out if we have no function symbols Alex Bennée
2020-03-27 10:53 ` Philippe Mathieu-Daudé [this message]
2020-03-27 11:10 ` Philippe Mathieu-Daudé
2020-03-27 11:45 ` Peter Maydell
2020-03-27 22:09 ` Richard Henderson
2020-03-27 9:49 ` [PATCH v1 2/7] linux-user: protect fcntl64 with an #ifdef Alex Bennée
2020-03-27 10:40 ` Laurent Vivier
2020-03-27 22:10 ` Richard Henderson
2020-03-27 9:49 ` [PATCH v1 3/7] tests/tcg: remove extraneous pasting macros Alex Bennée
2020-03-27 10:54 ` Philippe Mathieu-Daudé
2020-03-27 22:11 ` Richard Henderson
2020-03-27 9:49 ` [PATCH v1 4/7] linux-user: more debug for init_guest_space Alex Bennée
2020-03-27 10:50 ` Laurent Vivier
2020-03-27 9:49 ` [PATCH v1 5/7] fpu/softfloat: avoid undefined behaviour when normalising empty sigs Alex Bennée
2020-03-27 10:09 ` Peter Maydell
2020-03-27 22:27 ` Richard Henderson
2020-03-27 22:33 ` Peter Maydell
2020-03-27 10:13 ` Aleksandar Markovic
2020-03-27 10:31 ` Alex Bennée
2020-03-27 9:49 ` [PATCH v1 6/7] target/xtensa: add FIXME for translation memory leak Alex Bennée
2020-03-27 9:49 ` [PATCH v1 7/7] gdbstub: fix compiler complaining Alex Bennée
2020-03-27 10:56 ` Philippe Mathieu-Daudé
2020-03-27 10:53 ` [PATCH for 5.0 v1 0/7] A selection of sanitiser fixes no-reply
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