On 30 Jan 2021, at 08:26, Bora Agca 
<[email protected]<mailto:[email protected]>> wrote:

Hi, i have one question:

since the seL4 was written with a C compiler and it is possible that this
compiler has an in-built backdoor, how can you still claim, that seL4 is
"safe", i.e. non-hackable.

because we prove that the binary is a correct translation of the verified 
(formalised) C. The compiler is definitely *not* part of our TCB. [ATM this is 
true for Armv7 only, but that part of the verification will be completed for 
RISC-V soon.]

The white paper (https://sel4.systems/About/seL4-whitepaper.pdf) explains this 
on p 9–10.

Gernot
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