AUTO arguments can be used for:
- consts
- lens
- pointers
For const's and len's AUTO is replaced with the natural value,
addresses for AUTO pointers are allocated linearly.
This greatly simplifies writing test programs by hand
as most of the time we want these natural values.
Update tests to use AUTO.
Prog.Finalize combines assignSizesCall, SanitizeCall and validate.
Intended for users who build own programs,
so that we don't need to expose all individual methods.
* fixing weird merge error
* fixing presubmit
* fixing presubmit
* removing parsing code because of -Xraw option
* fix presubmit
* update
* deleting vma_call_handlers as we are currently skipping most vma calls. This simplifies memory_tracker as we don't need to keep track of vma allocations
* removing custom handling of bpf_instruction union
* removing ifconf parsing
* update
* removed all expression types and replaced them with constant types. removing ipv6_addr parsing while -Xraw is getting fixed. Removing constants.go
* removing ipv6 parsing
* presubmit
* moving direction check from ipv4_addr out to genUnion
* removing code that parses kcov
* removing redundant test
* removing custom code in generate unions to fill ipv4_addr
* proggen: changing order of imports to make external packages import first
fixing presubmit
* changing log messages to lower case to be consistent with other packages.
* removing pointer type and simplifying memory_tracker
removing comment
* moving context and return_cache to seaparate files
* deleting default argument generation when we should probably throw an error
1. mmap all memory always, without explicit mmap calls in the program.
This makes lots of things much easier and removes lots of code.
Makes mmap not a special syscall and allows to fuzz without mmap enabled.
2. Change address assignment algorithm.
Current algorithm allocates unmapped addresses too frequently
and allows collisions between arguments of a single syscall.
The new algorithm analyzes actual allocations in the program
and places new arguments at unused locations.
Make Foreach* callback accept the arg and a context struct
that can contain lots of aux info.
This (1) removes lots of unuser base/parent args,
(2) provides foundation for stopping recursion,
(3) allows to merge foreachSubargOffset.
Now each prog function accepts the desired target explicitly.
No global, implicit state involved.
This is much cleaner and allows cross-OS/arch testing, etc.
Large overhaul moves syscalls and arg types from sys to prog.
Sys package now depends on prog and contains only generated
descriptions of syscalls.
Introduce prog.Target type that encapsulates all targer properties,
like syscall list, ptr/page size, etc. Also moves OS-dependent pieces
like mmap call generation from prog to sys.
Update #191
We currently use uintptr for all values.
This won't work for 32-bit archs.
Moreover in some cases we use uintptr but assume
that it is always 64-bits (e.g. in encodingexec).
Switch everything to uint64.
Update #324
Right now Arg is a huge struct (160 bytes), which has many different fields
used for different arg kinds. Since most of the args we see in a typical
corpus are ArgConst, this results in a significant memory overuse.
This change:
- makes Arg an interface instead of a struct
- adds a SomethingArg struct for each arg kind we have
- converts all *Arg pointers into just Arg, since interface variable by
itself contains a pointer to the actual data
- removes ArgPageSize, now ConstArg is used instead
- consolidates correspondence between arg kinds and types, see comments
before each SomethingArg struct definition
- now LenType args that denote the length of VmaType args are serialized as
"0x1000" instead of "(0x1000)"; to preserve backwards compatibility
syzkaller is able to parse the old format for now
- multiple small changes all over to make the above work
After this change syzkaller uses twice less memory after deserializing a
typical corpus.
