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[PATCH v3 18/28] hw/vfio/pci: Replace g_memdup() by g_memdup2()
From: |
Philippe Mathieu-Daudé |
Subject: |
[PATCH v3 18/28] hw/vfio/pci: Replace g_memdup() by g_memdup2() |
Date: |
Fri, 3 Sep 2021 19:45:00 +0200 |
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() wrapper.
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
hw/vfio/pci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index e1ea1d8a23b..f7d0ef8cc61 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2040,7 +2040,7 @@ static void vfio_add_ext_cap(VFIOPCIDevice *vdev)
* physical device, we cache the config space to avoid overwriting
* the original config space when we parse the extended capabilities.
*/
- config = g_memdup(pdev->config, vdev->config_size);
+ config = g_memdup2(pdev->config, vdev->config_size);
/*
* Extended capabilities are chained with each pointing to the next, so we
--
2.31.1
- [PATCH v3 09/28] hw/acpi: Replace g_memdup() by g_memdup2(), (continued)
- [PATCH v3 09/28] hw/acpi: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 10/28] hw/core/machine: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 11/28] hw/hppa/machine: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 13/28] hw/net/eepro100: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 14/28] hw/nvram/fw_cfg: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 12/28] hw/i386/multiboot: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 15/28] hw/scsi/mptsas: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 16/28] hw/ppc/spapr_pci: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 17/28] hw/rdma: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 18/28] hw/vfio/pci: Replace g_memdup() by g_memdup2(),
Philippe Mathieu-Daudé <=
- [RFC PATCH v3 19/28] hw/virtio: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 20/28] net/colo: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [RFC PATCH v3 21/28] ui/clipboard: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [RFC PATCH v3 22/28] linux-user: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 23/28] tests/unit: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 24/28] tests/qtest: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 25/28] target/arm: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03
- [PATCH v3 26/28] target/ppc: Replace g_memdup() by g_memdup2(), Philippe Mathieu-Daudé, 2021/09/03