Linker fails on finding Symbols on (Samsung) Android Kernel Build

[jrw]

HI,

i try to build a Samsung Kernel with KASAN enabled but have problems getting it compiled.

how would you proceed from there to make it a successfull build?

I tried several cross compilers but i always end up with the same errors.

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/home/kerneldev/kernel/net/core/rtnetlink.c:2557: undefined reference to `__asan_alloca_poison'
/home/kerneldev/kernel/net/core/rtnetlink.c:2558: undefined reference to `__asan_alloca_poison'
/home/kerneldev/kernel/net/core/rtnetlink.c:2745: undefined reference to `__asan_allocas_unpoison'
/home/kerneldev/kernel/net/core/rtnetlink.c:2745: undefined reference to `__asan_allocas_unpoison'
/home/kerneldev/kernel/net/core/rtnetlink.c:2746: undefined reference to `__asan_allocas_unpoison'
net/netfilter/nfnetlink.o: In function `nfnetlink_rcv_msg':
/home/kerneldev/kernel/net/netfilter/nfnetlink.c:190: undefined reference to `__asan_alloca_poison'
/home/kerneldev/kernel/net/netfilter/nfnetlink.c:224: undefined reference to `__asan_allocas_unpoison'
/home/kerneldev/kernel/net/netfilter/nfnetlink.c:224: undefined reference to `__asan_allocas_unpoison'
/home/kerneldev/kernel/net/netfilter/nfnetlink.c:225: undefined reference to `__asan_allocas_unpoison'
net/netfilter/nfnetlink.o: In function `nfnetlink_rcv_batch':
/home/kerneldev/kernel/net/netfilter/nfnetlink.c:407: undefined reference to `__asan_allocas_unpoison'
/home/kerneldev/kernel/net/netfilter/nfnetlink.c:384: undefined reference to `__asan_alloca_poison'
/home/kerneldev/kernel/net/netfilter/nfnetlink.c:454: undefined reference to `__asan_allocas_unpoison'
net/bluetooth/smp.o: In function `aes_cmac':
/home/kerneldev/kernel/net/bluetooth/smp.c:175: undefined reference to `__asan_alloca_poison'
/home/kerneldev/kernel/net/bluetooth/smp.c:214: undefined reference to `__asan_allocas_unpoison'
/home/kerneldev/kernel/net/bluetooth/smp.c:214: undefined reference to `__asan_allocas_unpoison'
net/wireless/nl80211.o: In function `nl80211_send_wiphy':
/home/kerneldev/kernel/net/wireless/nl80211.c:1914: undefined reference to `__asan_set_shadow_00'

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the only thing i could find was a stackoverflow post [1] but this guy also had no solution to the problem.

[1] https://stackoverflow.com/questions/58717275/compiling-aosp-kernel-with-kasan

Thanks for any help!

[Dmitry Vyukov]

+kasan-dev BCC:libfuzzer

[manika...@gmail.com]

Find the definitions from google and add to ur local source. It will compile with out errors and works fine.

ref. https://elixir.bootlin.com/linux/v4.19.151/source/mm/kasan/kasan.c