| Message ID | 20210903174510.751630-25-philmd@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v3,01/28] hw/hyperv/vmbus: Remove unused vmbus_load/save_req() | expand |
On 03/09/2021 19.45, 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() wrapper. > > Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> > --- > tests/qtest/libqos/ahci.c | 6 +++--- > tests/qtest/libqos/qgraph.c | 2 +- > 2 files changed, 4 insertions(+), 4 deletions(-) > > diff --git a/tests/qtest/libqos/ahci.c b/tests/qtest/libqos/ahci.c > index fba3e7a954e..eaa2096512e 100644 > --- a/tests/qtest/libqos/ahci.c > +++ b/tests/qtest/libqos/ahci.c > @@ -639,8 +639,8 @@ void ahci_exec(AHCIQState *ahci, uint8_t port, > AHCIOpts *opts; > uint64_t buffer_in; > > - opts = g_memdup((opts_in == NULL ? &default_opts : opts_in), > - sizeof(AHCIOpts)); > + opts = g_memdup2((opts_in == NULL ? &default_opts : opts_in), > + sizeof(AHCIOpts)); > > buffer_in = opts->buffer; > > @@ -860,7 +860,7 @@ AHCICommand *ahci_command_create(uint8_t command_name) > g_assert(!props->ncq || props->lba48); > > /* Defaults and book-keeping */ > - cmd->props = g_memdup(props, sizeof(AHCICommandProp)); > + cmd->props = g_memdup2(props, sizeof(AHCICommandProp)); > cmd->name = command_name; > cmd->xbytes = props->size; > cmd->prd_size = 4096; > diff --git a/tests/qtest/libqos/qgraph.c b/tests/qtest/libqos/qgraph.c > index d1dc4919305..109ff04e1e8 100644 > --- a/tests/qtest/libqos/qgraph.c > +++ b/tests/qtest/libqos/qgraph.c > @@ -93,7 +93,7 @@ static void add_edge(const char *source, const char *dest, > edge->type = type; > edge->dest = g_strdup(dest); > edge->edge_name = g_strdup(opts->edge_name ?: dest); > - edge->arg = g_memdup(opts->arg, opts->size_arg); > + edge->arg = g_memdup2(opts->arg, opts->size_arg); > > edge->before_cmd_line = > opts->before_cmd_line ? g_strconcat(" ", opts->before_cmd_line, NULL) : NULL; > Reviewed-by: Thomas Huth <thuth@redhat.com>
Le 03/09/2021 à 19:45, Philippe Mathieu-Daudé a écrit : > 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> > --- > tests/qtest/libqos/ahci.c | 6 +++--- > tests/qtest/libqos/qgraph.c | 2 +- > 2 files changed, 4 insertions(+), 4 deletions(-) > > diff --git a/tests/qtest/libqos/ahci.c b/tests/qtest/libqos/ahci.c > index fba3e7a954e..eaa2096512e 100644 > --- a/tests/qtest/libqos/ahci.c > +++ b/tests/qtest/libqos/ahci.c > @@ -639,8 +639,8 @@ void ahci_exec(AHCIQState *ahci, uint8_t port, > AHCIOpts *opts; > uint64_t buffer_in; > > - opts = g_memdup((opts_in == NULL ? &default_opts : opts_in), > - sizeof(AHCIOpts)); > + opts = g_memdup2((opts_in == NULL ? &default_opts : opts_in), > + sizeof(AHCIOpts)); > > buffer_in = opts->buffer; > > @@ -860,7 +860,7 @@ AHCICommand *ahci_command_create(uint8_t command_name) > g_assert(!props->ncq || props->lba48); > > /* Defaults and book-keeping */ > - cmd->props = g_memdup(props, sizeof(AHCICommandProp)); > + cmd->props = g_memdup2(props, sizeof(AHCICommandProp)); > cmd->name = command_name; > cmd->xbytes = props->size; > cmd->prd_size = 4096; > diff --git a/tests/qtest/libqos/qgraph.c b/tests/qtest/libqos/qgraph.c > index d1dc4919305..109ff04e1e8 100644 > --- a/tests/qtest/libqos/qgraph.c > +++ b/tests/qtest/libqos/qgraph.c > @@ -93,7 +93,7 @@ static void add_edge(const char *source, const char *dest, > edge->type = type; > edge->dest = g_strdup(dest); > edge->edge_name = g_strdup(opts->edge_name ?: dest); > - edge->arg = g_memdup(opts->arg, opts->size_arg); > + edge->arg = g_memdup2(opts->arg, opts->size_arg); > > edge->before_cmd_line = > opts->before_cmd_line ? g_strconcat(" ", opts->before_cmd_line, NULL) : NULL; > Applied to my trivial-patches branch. Thanks, Laurent
diff --git a/tests/qtest/libqos/ahci.c b/tests/qtest/libqos/ahci.c index fba3e7a954e..eaa2096512e 100644 --- a/tests/qtest/libqos/ahci.c +++ b/tests/qtest/libqos/ahci.c @@ -639,8 +639,8 @@ void ahci_exec(AHCIQState *ahci, uint8_t port, AHCIOpts *opts; uint64_t buffer_in; - opts = g_memdup((opts_in == NULL ? &default_opts : opts_in), - sizeof(AHCIOpts)); + opts = g_memdup2((opts_in == NULL ? &default_opts : opts_in), + sizeof(AHCIOpts)); buffer_in = opts->buffer; @@ -860,7 +860,7 @@ AHCICommand *ahci_command_create(uint8_t command_name) g_assert(!props->ncq || props->lba48); /* Defaults and book-keeping */ - cmd->props = g_memdup(props, sizeof(AHCICommandProp)); + cmd->props = g_memdup2(props, sizeof(AHCICommandProp)); cmd->name = command_name; cmd->xbytes = props->size; cmd->prd_size = 4096; diff --git a/tests/qtest/libqos/qgraph.c b/tests/qtest/libqos/qgraph.c index d1dc4919305..109ff04e1e8 100644 --- a/tests/qtest/libqos/qgraph.c +++ b/tests/qtest/libqos/qgraph.c @@ -93,7 +93,7 @@ static void add_edge(const char *source, const char *dest, edge->type = type; edge->dest = g_strdup(dest); edge->edge_name = g_strdup(opts->edge_name ?: dest); - edge->arg = g_memdup(opts->arg, opts->size_arg); + edge->arg = g_memdup2(opts->arg, opts->size_arg); edge->before_cmd_line = opts->before_cmd_line ? g_strconcat(" ", opts->before_cmd_line, NULL) : NULL;
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> --- tests/qtest/libqos/ahci.c | 6 +++--- tests/qtest/libqos/qgraph.c | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-)