From: "Philippe Mathieu-Daudé" <philmd@redhat.com>
To: qemu-devel@nongnu.org
Cc: "Peter Maydell" <peter.maydell@linaro.org>,
"Laurent Vivier" <laurent@vivier.eu>,
qemu-arm@nongnu.org, qemu-ppc@nongnu.org,
"Gerd Hoffmann" <kraxel@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Alex Bennée" <alex.bennee@linaro.org>
Subject: Re: [PATCH v3 16/17] configure: Prohibit alloca() by using -Walloca CPPFLAG
Date: Fri, 7 May 2021 19:14:03 +0200 [thread overview]
Message-ID: <4bc42a9f-fcb6-40b0-cbe6-6b75c13c1440@redhat.com> (raw)
In-Reply-To: <20210507144315.1994337-17-philmd@redhat.com>
On 5/7/21 4:43 PM, Philippe Mathieu-Daudé wrote:
> Now that we removed all alloca() calls in the repository, add the
> -Walloca CPPFLAG to trigger a build failure if such stack allocation
> is used.
>
> Rationale: The ALLOCA(3) man-page mentions its "use is discouraged".
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
> As there is an alloca() call in libslirp, this patch is pending
> on the following libslirp patch to be merged:
> https://lists.freedesktop.org/archives/slirp/2021-May/000150.html
> (and the submodule updated).
> ---
> configure | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/configure b/configure
> index 4f374b48890..67cb6d5421c 100755
> --- a/configure
> +++ b/configure
> @@ -552,7 +552,7 @@ ARFLAGS="${ARFLAGS-rv}"
> # provides these semantics.)
> QEMU_CFLAGS="-fno-strict-aliasing -fno-common -fwrapv $QEMU_CFLAGS"
> QEMU_CFLAGS="-Wundef -Wwrite-strings -Wmissing-prototypes $QEMU_CFLAGS"
> -QEMU_CFLAGS="-Wstrict-prototypes -Wredundant-decls $QEMU_CFLAGS"
> +QEMU_CFLAGS="-Wstrict-prototypes -Wredundant-decls -Walloca $QEMU_CFLAGS"
> QEMU_CFLAGS="-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE $QEMU_CFLAGS"
Sigh I forgot one Clang version (7.0.1) doesn't recognize this warning.
I'll replace this patch by:
-- >8 --
diff --git a/configure b/configure
index 4f374b48890..4330245fa1f 100755
--- a/configure
+++ b/configure
@@ -2083,2 +2083,3 @@ add_to warn_flags -Wexpansion-to-defined
add_to warn_flags -Wimplicit-fallthrough=2
+add_to warn_flags -Walloca
---
Regards,
Phil.
next prev parent reply other threads:[~2021-05-07 17:16 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-07 14:42 [PATCH v3 00/17] misc: Replace alloca() by g_malloc() Philippe Mathieu-Daudé
2021-05-07 14:42 ` [PATCH v3 01/17] bsd-user/syscall: Replace alloca() by g_try_new() Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 02/17] linux-user/elfload: Replace alloca() by g_try_malloc() Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 03/17] linux-user/syscall: Replace alloca() by g_try_new() Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 04/17] linux-user/syscall: Replace alloca() by g_try_malloc() Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 05/17] linux-user: Replace alloca() by g_try_new() in ppoll() syscall Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 06/17] linux-user: Replace alloca() by g_try_malloc() in setsockopt() syscall Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 07/17] linux-user: Replace alloca() by g_try_malloc() in various socket syscall Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 08/17] linux-user/syscall: Move code around in do_sendrecvmsg_locked() Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 09/17] linux-user/syscall: Replace alloca() by GLib alloc() in sendrecvmsg Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 10/17] audio/alsaaudio: Replace ALSA alloca() by malloc() equivalent Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 11/17] backends/tpm: Replace g_alloca() by g_malloc() Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 12/17] gdbstub: Constify GdbCmdParseEntry Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 13/17] gdbstub: Replace GdbCmdContext with plain g_array() Philippe Mathieu-Daudé
2021-05-07 14:43 ` [PATCH v3 14/17] hw/misc/pca9552: Replace g_newa() by g_new() Philippe Mathieu-Daudé
2021-05-10 5:59 ` Cédric Le Goater
2021-05-07 14:43 ` [PATCH v3 15/17] target/ppc/kvm: Replace alloca() by g_malloc() Philippe Mathieu-Daudé
2021-05-10 5:38 ` David Gibson
2021-05-07 14:43 ` [PATCH v3 16/17] configure: Prohibit alloca() by using -Walloca CPPFLAG Philippe Mathieu-Daudé
2021-05-07 17:14 ` Philippe Mathieu-Daudé [this message]
2021-05-07 14:43 ` [NOTFORMERGE PATCH v3 17/17] configure: libSLiRP buildsys kludge Philippe Mathieu-Daudé
2021-05-07 17:15 ` Philippe Mathieu-Daudé
2021-05-07 17:19 ` [PATCH v3 18/17] tests/unit/test-char: Replace g_alloca() by buffer on the stack Philippe Mathieu-Daudé
2021-05-07 20:44 ` Marc-André Lureau
2021-05-07 21:25 ` Richard Henderson
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