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gh-111178: fix UBSan failures in Modules/pyexpat.c #129789

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Merged
encukou merged 7 commits into from
Feb 24, 2025
Merged

gh-111178: fix UBSan failures in Modules/pyexpat.c #129789

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b493e35
fix UBSan failures for `xmlparseobject`
picnixz Feb 6, 2025
3aa3f98
suppress unused return values
picnixz Feb 6, 2025
579fc9e
fix UBSan failures for XML handler setters
picnixz Feb 6, 2025
53dc42b
rewrite `RC_HANDLER` with better semantics
picnixz Feb 6, 2025
a5c9493
Merge remote-tracking branch 'upstream/main' into fix/ubsan/pyexpat-1…
picnixz Feb 7, 2025
46ccb79
address Petr's review
picnixz Feb 22, 2025
71512f4
Merge branch 'main' into fix/ubsan/pyexpat-111178
picnixz Feb 22, 2025
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address Petr's review
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@picnixz
picnixz committed Feb 22, 2025
commit 46ccb79a71b392b705b1ac344294b029ee73af44
13 changes: 6 additions & 7 deletions Modules/pyexpat.c
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Original file line number Diff line number Diff line change
Expand Up @@ -98,16 +98,12 @@ typedef struct {

#define CHARACTER_DATA_BUFFER_SIZE 8192

typedef const void* xmlhandler;
typedef const void *xmlhandler;
typedef void (*xmlhandlersetter)(XML_Parser self, xmlhandler handler);

struct HandlerInfo {
const char *name;
// To avoid UBSan failures, we cannot use the 'xmlhandlersetter' type,
// as the signature of the setters will not be compatible. However, we
// can safely convert the pointers since a setter function will be passed
// a correct handler.
const void *setter;
xmlhandlersetter setter;
xmlhandler handler;
PyGetSetDef getset;
};
Expand Down Expand Up @@ -2215,8 +2211,11 @@ clear_handlers(xmlparseobject *self, int initial)

static struct HandlerInfo handler_info[] = {

// The cast to `xmlhandlersetter` is needed as the signature of XML
// handler functions is not compatible with `xmlhandlersetter` since
// their second parameter is narrower than a `const void *`.
#define HANDLER_INFO(name) \
{#name, XML_Set##name, my_##name},
{#name, (xmlhandlersetter)XML_Set##name, my_##name},

HANDLER_INFO(StartElementHandler)
HANDLER_INFO(EndElementHandler)
Expand Down