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106 lines
3.7 KiB
106 lines
3.7 KiB
7 months ago
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From 939c75ab92ac608893cad0e46f55527950518a57 Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Tue, 5 Mar 2024 11:36:15 -0500
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Subject: [PATCH 1/3] glib-compat: Introduce g_memdup2() wrapper
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 353: ui/clipboard: mark type as not available when there is no data
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RH-Jira: RHEL-19628
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RH-Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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RH-Acked-by: Gerd Hoffmann <None>
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RH-Commit: [1/2] f401c63303ef558bfcbb36e4c8fcc8bf2b1c3eb4 (redhat/rhel/src/qemu-kvm/jons-qemu-kvm-2)
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JIRA: https://issues.redhat.com/browse/RHEL-19628
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CVE: CVE-2023-6683
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Upstream: Merged
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commit 2c674fada72079583a3f2cc1790b16a0259c4fa0
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Author: Philippe Mathieu-Daudé <philmd@linaro.org>
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Date: Fri Sep 3 19:44:44 2021 +0200
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glib-compat: Introduce g_memdup2() wrapper
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When experimenting raising GLIB_VERSION_MIN_REQUIRED to 2.68
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(Fedora 34 provides GLib 2.68.1) we get:
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hw/virtio/virtio-crypto.c:245:24: error: 'g_memdup' is deprecated: Use 'g_memdup2' instead [-Werror,-Wdeprecated-declarations]
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...
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g_memdup() has been updated by g_memdup2() to fix eventual security
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issues (size argument is 32-bit and could be truncated / wrapping).
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GLib recommends to copy their static inline version of g_memdup2():
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https://discourse.gnome.org/t/port-your-module-from-g-memdup-to-g-memdup2-now/5538
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Our glib-compat.h provides a comment explaining how to deal with
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these deprecated declarations (see commit e71e8cc0355
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"glib: enforce the minimum required version and warn about old APIs").
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Following this comment suggestion, implement the g_memdup2_qemu()
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wrapper to g_memdup2(), and use the safer equivalent inlined when
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we are using pre-2.68 GLib.
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Reported-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Message-Id: <20210903174510.751630-3-philmd@redhat.com>
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Signed-off-by: Laurent Vivier <laurent@vivier.eu>
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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include/glib-compat.h | 37 +++++++++++++++++++++++++++++++++++++
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1 file changed, 37 insertions(+)
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diff --git a/include/glib-compat.h b/include/glib-compat.h
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index 9e95c888f5..8d01a8c01f 100644
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--- a/include/glib-compat.h
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+++ b/include/glib-compat.h
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@@ -68,6 +68,43 @@
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* without generating warnings.
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*/
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+/*
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+ * g_memdup2_qemu:
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+ * @mem: (nullable): the memory to copy.
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+ * @byte_size: the number of bytes to copy.
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+ *
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+ * Allocates @byte_size bytes of memory, and copies @byte_size bytes into it
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+ * from @mem. If @mem is %NULL it returns %NULL.
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+ *
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+ * This replaces g_memdup(), which was prone to integer overflows when
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+ * converting the argument from a #gsize to a #guint.
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+ *
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+ * This static inline version is a backport of the new public API from
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+ * GLib 2.68, kept internal to GLib for backport to older stable releases.
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+ * See https://gitlab.gnome.org/GNOME/glib/-/issues/2319.
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+ *
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+ * Returns: (nullable): a pointer to the newly-allocated copy of the memory,
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+ * or %NULL if @mem is %NULL.
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+ */
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+static inline gpointer g_memdup2_qemu(gconstpointer mem, gsize byte_size)
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+{
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+#if GLIB_CHECK_VERSION(2, 68, 0)
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+ return g_memdup2(mem, byte_size);
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+#else
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+ gpointer new_mem;
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+
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+ if (mem && byte_size != 0) {
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+ new_mem = g_malloc(byte_size);
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+ memcpy(new_mem, mem, byte_size);
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+ } else {
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+ new_mem = NULL;
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+ }
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+
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+ return new_mem;
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+#endif
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+}
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+#define g_memdup2(m, s) g_memdup2_qemu(m, s)
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+
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#if defined(G_OS_UNIX)
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/*
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* Note: The fallback implementation is not MT-safe, and it returns a copy of
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--
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2.41.0
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