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libexec/ld.so/SPECS.randomdata
48 строк
2 KB
mortimer
Bump ELF_RANDOMIZE_LIMIT to 1MB.
01 июн 2018, 06:27
01 июн 2018, 06:27
8b42453
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$OpenBSD: SPECS.randomdata,v 1.3 2018/06/01 03:27:59 mortimer Exp $ This document describes the OpenBSD operating system supplement for adding "random data" sections to the ELF ABI. These sections can be useful for holding values like GCC's stack-smashing protector cookies and offer additional benefits like ensuring the data is initialized before any constructor methods are called and allowing the dynamic linker to mark the memory as read-only after initialization. Program Header OpenBSD defines the following operating system-specific segment type: Name Value PT_OPENBSD_RANDOMIZE 0x65a3dbe6 PT_OPENBSD_RANDOMIZE The array element specifies the location and size of a random data section. The system will initialize the specified memory range with random data. The memory range must be separately mapped (e.g., by use of a PT_LOAD segment). Special Sections OpenBSD defines the following operating system-specific special sections: Name Type Attributes .openbsd.randomdata SHT_PROGBITS SHF_ALLOC .openbsd.randomdata This section holds the random data section. Implementation Notes On OpenBSD, PT_OPENBSD_RANDOMIZE segments are handled alongside PT_LOAD segments: the kernel handles initializing random data segments in executables and program interpreters (i.e., ld.so), while ld.so handles initializing them in shared libraries. Additionally, the kernel limits the total number of PT_OPENBSD_RANDOMIZE segment bytes in an executable or interpreter to 1048576 bytes.