WIP runtime/libia2: Protect RW segments for libc and ld.so#628
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WIP runtime/libia2: Protect RW segments for libc and ld.so#628
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This is currently expected to crash most programs since calls into libc from compartments other than pkey = 1 do not change compartments.
ayrtonm
commented
Aug 12, 2025
| @@ -1,5 +1,9 @@ | |||
| #include "ia2.h" | |||
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| void ia2_compartment_destructor_1(void); | |||
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TODO: Move this somewhere else/generate it from the rewriter.
ayrtonm
commented
Aug 12, 2025
| project(libia2) | ||
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| add_library(libia2 ia2.c init.c threads.c main.c exit.c memory_maps.c thread_name.c) | ||
| add_library(libia2 ia2.c init.c threads.c main.c memory_maps.c thread_name.c) |
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TODO: Do we want to keep the option of exiting the process in the untrusted compartment?
This was referenced Aug 12, 2025
ayrtonm
commented
Aug 12, 2025
| } | ||
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| #if IA2_REWRITING | ||
| void *__tls_get_addr(size_t m, size_t offset) { |
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This could be autogenerated by the rewriter w/o requiring that it appears in user-code, but this was the easiest way to test this. This function is defined in ld.so which is in the same compartment as main.c and the call to __tls_get_addr in library.c is required for the rewriter to realize it needs to generate callgates to call it from that compartment. It then adds the -Wl,--wrap flag for this function and uses that when linking library.o.
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This is currently expected to crash most programs since calls into libc from compartments other than pkey = 1 do not change compartments.