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[PATCH 06/28] softmmu: Replace g_memdup() by g_memdup2_qemu()
From: |
Philippe Mathieu-Daudé |
Subject: |
[PATCH 06/28] softmmu: Replace g_memdup() by g_memdup2_qemu() |
Date: |
Fri, 3 Sep 2021 13:06:40 +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_qemu() wrapper.
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
softmmu/memory.c | 2 +-
softmmu/vl.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/softmmu/memory.c b/softmmu/memory.c
index bfedaf9c4df..838a274b627 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -1140,7 +1140,7 @@ static char *memory_region_escape_name(const char *name)
bytes += memory_region_need_escape(*p) ? 4 : 1;
}
if (bytes == p - name) {
- return g_memdup(name, bytes + 1);
+ return g_memdup2_qemu(name, bytes + 1);
}
escaped = g_malloc(bytes + 1);
diff --git a/softmmu/vl.c b/softmmu/vl.c
index ea05bb39c50..a136ef0bfb6 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -1154,7 +1154,7 @@ static int parse_fw_cfg(void *opaque, QemuOpts *opts,
Error **errp)
}
if (nonempty_str(str)) {
size = strlen(str); /* NUL terminator NOT included in fw_cfg blob */
- buf = g_memdup(str, size);
+ buf = g_memdup2_qemu(str, size);
} else if (nonempty_str(gen_id)) {
if (!fw_cfg_add_from_generator(fw_cfg, name, gen_id, errp)) {
return -1;
--
2.31.1
[PATCH 03/28] qapi: Replace g_memdup() by g_memdup2_qemu(), Philippe Mathieu-Daudé, 2021/09/03
[PATCH 04/28] accel/tcg: Replace g_memdup() by g_memdup2_qemu(), Philippe Mathieu-Daudé, 2021/09/03
[PATCH 05/28] block/qcow2-bitmap: Replace g_memdup() by g_memdup2_qemu(), Philippe Mathieu-Daudé, 2021/09/03
[PATCH 06/28] softmmu: Replace g_memdup() by g_memdup2_qemu(),
Philippe Mathieu-Daudé <=
[PATCH 07/28] hw/9pfs: Replace g_memdup() by g_memdup2_qemu(), Philippe Mathieu-Daudé, 2021/09/03
[PATCH 08/28] hw/acpi: Avoid truncating acpi_data_len() to 32-bit, Philippe Mathieu-Daudé, 2021/09/03
[PATCH 09/28] hw/acpi: Replace g_memdup() by g_memdup2_qemu(), Philippe Mathieu-Daudé, 2021/09/03
[PATCH 10/28] hw/core/machine: Replace g_memdup() by g_memdup2_qemu(), Philippe Mathieu-Daudé, 2021/09/03
[PATCH 11/28] hw/hppa/machine: Replace g_memdup() by g_memdup2_qemu(), Philippe Mathieu-Daudé, 2021/09/03
[PATCH 12/28] hw/i386/multiboot: Replace g_memdup() by g_memdup2_qemu(), Philippe Mathieu-Daudé, 2021/09/03
[PATCH 13/28] hw/net/eepro100: Replace g_memdup() by g_memdup2_qemu(), Philippe Mathieu-Daudé, 2021/09/03
[PATCH 14/28] hw/nvram/fw_cfg: Replace g_memdup() by g_memdup2_qemu(), Philippe Mathieu-Daudé, 2021/09/03