Improve libelf diagnostics, fix bugs and typos#27
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Add elf_errmsg () to elf_begin (), elf_getphdrnum (), gelf_getphdr () failure messages so libelf error reasons are visible. In process_dbgapi_events (), switch on one_bit instead of stop_reason to correctly handle single bit stop-reasons. In log (), use vsnprintf with size+1 buffer and resize to avoid buffer overrun; replace vsprintf. In code_object_t::open (), add a bounds check when %-decoding the URI to avoid an out-of-bounds memory access. Check elf_strptr () for null before constructing a std::string. Fix typos. Change-Id: I71ea1641d21190d5c2d8525e9aaf3837cc35057b
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Add elf_errmsg () to elf_begin (), elf_getphdrnum (), gelf_getphdr () failure messages so libelf error reasons are visible.
In process_dbgapi_events (), switch on one_bit instead of stop_reason to correctly handle single bit stop-reasons.
In log (), use vsnprintf with size+1 buffer and resize to avoid buffer overrun; replace vsprintf.
In code_object_t::open (), add a bounds check when %-decoding the URI to avoid an out-of-bounds memory access.
Check elf_strptr () for null before constructing a std::string.
Fix typos.
Change-Id: I71ea1641d21190d5c2d8525e9aaf3837cc35057b