From: David Gibson <david@gibson.dropbear.id.au>
To: "Philippe Mathieu-Daudé" <philmd@redhat.com>
Cc: "Fam Zheng" <fam@euphon.net>,
"Peter Maydell" <peter.maydell@linaro.org>,
"Li Zhijian" <lizhijian@cn.fujitsu.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Jason Wang" <jasowang@redhat.com>,
"Christian Schoenebeck" <qemu_oss@crudebyte.com>,
qemu-devel@nongnu.org, "Peter Xu" <peterx@redhat.com>,
"Gerd Hoffmann" <kraxel@redhat.com>,
"Alexandre Iooss" <erdnaxe@crans.org>,
"Eric Blake" <eblake@redhat.com>,
qemu-block@nongnu.org, "Zhang Chen" <chen.zhang@intel.com>,
"Alex Bennée" <alex.bennee@linaro.org>,
"Helge Deller" <deller@gmx.de>,
"David Hildenbrand" <david@redhat.com>,
"Markus Armbruster" <armbru@redhat.com>,
"Gonglei (Arei)" <arei.gonglei@huawei.com>,
"Stefan Weil" <sw@weilnetz.de>,
"Laurent Vivier" <lvivier@redhat.com>,
"Thomas Huth" <thuth@redhat.com>,
"Eduardo Habkost" <ehabkost@redhat.com>,
"Michael Roth" <michael.roth@amd.com>,
"Richard Henderson" <richard.henderson@linaro.org>,
"Greg Kurz" <groug@kaod.org>,
"Yuval Shaia" <yuval.shaia.ml@gmail.com>,
"Alex Williamson" <alex.williamson@redhat.com>,
qemu-arm@nongnu.org, "Paolo Bonzini" <pbonzini@redhat.com>,
"John Snow" <jsnow@redhat.com>, "Kevin Wolf" <kwolf@redhat.com>,
"Vladimir Sementsov-Ogievskiy" <vsementsov@virtuozzo.com>,
"Laurent Vivier" <laurent@vivier.eu>,
"Shannon Zhao" <shannon.zhaosl@gmail.com>,
"Hanna Reitz" <hreitz@redhat.com>,
qemu-ppc@nongnu.org, "Igor Mammedov" <imammedo@redhat.com>,
"Mahmoud Mandour" <ma.mandourr@gmail.com>
Subject: Re: [PATCH 26/28] target/ppc: Replace g_memdup() by g_memdup2_qemu()
Date: Fri, 3 Sep 2021 21:45:35 +1000 [thread overview]
Message-ID: <YTIK35r5tWqs8US/@yekko> (raw)
In-Reply-To: <20210903110702.588291-27-philmd@redhat.com>
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On Fri, Sep 03, 2021 at 01:07:00PM +0200, Philippe Mathieu-Daudé wrote:
> Per https://discourse.gnome.org/t/port-your-module-from-g-memdup-to-g-memdup2-now/5538
>
> The old API took the size of the memory to duplicate as a guint,
> whereas most memory functions take memory sizes as a gsize. This
> made it easy to accidentally pass a gsize to g_memdup(). For large
> values, that would lead to a silent truncation of the size from 64
> to 32 bits, and result in a heap area being returned which is
> significantly smaller than what the caller expects. This can likely
> be exploited in various modules to cause a heap buffer overflow.
>
> Replace g_memdup() by the safer g_memdup2_qemu() wrapper.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
> ---
> target/ppc/mmu-hash64.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/target/ppc/mmu-hash64.c b/target/ppc/mmu-hash64.c
> index 19832c4b46f..2ee6025a406 100644
> --- a/target/ppc/mmu-hash64.c
> +++ b/target/ppc/mmu-hash64.c
> @@ -1122,7 +1122,8 @@ void ppc_hash64_init(PowerPCCPU *cpu)
> return;
> }
>
> - cpu->hash64_opts = g_memdup(pcc->hash64_opts, sizeof(*cpu->hash64_opts));
> + cpu->hash64_opts = g_memdup2_qemu(pcc->hash64_opts,
> + sizeof(*cpu->hash64_opts));
> }
>
> void ppc_hash64_finalize(PowerPCCPU *cpu)
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2021-09-04 3:26 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-03 11:06 [PATCH 00/28] glib: Replace g_memdup() by g_memdup2_qemu() Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 01/28] hw/hyperv/vmbus: Remove unused vmbus_load/save_req() Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 02/28] glib-compat: Introduce g_memdup2() wrapper Philippe Mathieu-Daudé
2021-09-03 11:16 ` Daniel P. Berrangé
2021-09-03 11:51 ` Vladimir Sementsov-Ogievskiy
2021-09-03 11:56 ` Daniel P. Berrangé
2021-09-03 12:03 ` Vladimir Sementsov-Ogievskiy
2021-09-03 17:09 ` Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 03/28] qapi: Replace g_memdup() by g_memdup2_qemu() Philippe Mathieu-Daudé
2021-09-03 11:18 ` Daniel P. Berrangé
2021-09-03 17:10 ` Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 04/28] accel/tcg: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 05/28] block/qcow2-bitmap: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 06/28] softmmu: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 07/28] hw/9pfs: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 08/28] hw/acpi: Avoid truncating acpi_data_len() to 32-bit Philippe Mathieu-Daudé
2021-09-08 7:15 ` Igor Mammedov
2021-09-03 11:06 ` [PATCH 09/28] hw/acpi: Replace g_memdup() by g_memdup2_qemu() Philippe Mathieu-Daudé
2021-09-08 7:16 ` Igor Mammedov
2021-09-03 11:06 ` [PATCH 10/28] hw/core/machine: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 11/28] hw/hppa/machine: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 12/28] hw/i386/multiboot: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 13/28] hw/net/eepro100: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 14/28] hw/nvram/fw_cfg: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 15/28] hw/scsi/mptsas: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 16/28] hw/ppc/spapr_pci: " Philippe Mathieu-Daudé
2021-09-03 11:45 ` David Gibson
2021-09-03 11:06 ` [PATCH 17/28] hw/rdma: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 18/28] hw/vfio/pci: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [RFC PATCH 19/28] hw/virtio: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 20/28] net/colo: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [RFC PATCH 21/28] ui/clipboard: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [RFC PATCH 22/28] linux-user: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 23/28] tests/unit: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 24/28] tests/qtest: " Philippe Mathieu-Daudé
2021-09-03 11:06 ` [PATCH 25/28] target/arm: " Philippe Mathieu-Daudé
2021-09-03 11:07 ` [PATCH 26/28] target/ppc: " Philippe Mathieu-Daudé
2021-09-03 11:45 ` David Gibson [this message]
2021-09-03 11:07 ` [PATCH 27/28] contrib: " Philippe Mathieu-Daudé
2021-09-03 11:07 ` [PATCH 28/28] checkpatch: Do not allow deprecated g_memdup() Philippe Mathieu-Daudé
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