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[PATCH 04/28] accel/tcg: Replace g_memdup() by g_memdup2_qemu()
From: |
Philippe Mathieu-Daudé |
Subject: |
[PATCH 04/28] accel/tcg: Replace g_memdup() by g_memdup2_qemu() |
Date: |
Fri, 3 Sep 2021 13:06:38 +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>
---
accel/tcg/cputlb.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
index b1e5471f949..1d5069a30d1 100644
--- a/accel/tcg/cputlb.c
+++ b/accel/tcg/cputlb.c
@@ -826,7 +826,7 @@ void tlb_flush_range_by_mmuidx(CPUState *cpu, target_ulong
addr,
tlb_flush_range_by_mmuidx_async_0(cpu, d);
} else {
/* Otherwise allocate a structure, freed by the worker. */
- TLBFlushRangeData *p = g_memdup(&d, sizeof(d));
+ TLBFlushRangeData *p = g_memdup2_qemu(&d, sizeof(d));
async_run_on_cpu(cpu, tlb_flush_range_by_mmuidx_async_1,
RUN_ON_CPU_HOST_PTR(p));
}
@@ -868,7 +868,7 @@ void tlb_flush_range_by_mmuidx_all_cpus(CPUState *src_cpu,
/* Allocate a separate data block for each destination cpu. */
CPU_FOREACH(dst_cpu) {
if (dst_cpu != src_cpu) {
- TLBFlushRangeData *p = g_memdup(&d, sizeof(d));
+ TLBFlushRangeData *p = g_memdup2_qemu(&d, sizeof(d));
async_run_on_cpu(dst_cpu,
tlb_flush_range_by_mmuidx_async_1,
RUN_ON_CPU_HOST_PTR(p));
@@ -918,13 +918,13 @@ void tlb_flush_range_by_mmuidx_all_cpus_synced(CPUState
*src_cpu,
/* Allocate a separate data block for each destination cpu. */
CPU_FOREACH(dst_cpu) {
if (dst_cpu != src_cpu) {
- p = g_memdup(&d, sizeof(d));
+ p = g_memdup2_qemu(&d, sizeof(d));
async_run_on_cpu(dst_cpu, tlb_flush_range_by_mmuidx_async_1,
RUN_ON_CPU_HOST_PTR(p));
}
}
- p = g_memdup(&d, sizeof(d));
+ p = g_memdup2_qemu(&d, sizeof(d));
async_safe_run_on_cpu(src_cpu, tlb_flush_range_by_mmuidx_async_1,
RUN_ON_CPU_HOST_PTR(p));
}
--
2.31.1
- [PATCH 01/28] hw/hyperv/vmbus: Remove unused vmbus_load/save_req(), (continued)
[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 <=
[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, 2021/09/03
[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