llvm dev - Mar 2020 - Enable Safe Stack for Baremetal?

Hello,

I'm assessing the work required to enable Safe Stack for a bare metal
target.
Looking at compiler-rt/lib/safestack/, the current implementation depends on
thread support for mutex & storing unsafe stack pointer.
It also need several system calls: gettid, tgkill, mmap, munmap, mprotect.

Our target doesn't has all underlying support it needs. My question is:
what's the minimum requirement to port Safe Stack to bare metal?

Thanks,
Zhaoshi
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Hello,

I'm assessing the work required to enable Safe Stack for a bare metal
target.
Looking at compiler-rt/lib/safestack/, the current implementation depends on
thread support for mutex & storing unsafe stack pointer.
It also need several system calls: gettid, tgkill, mmap, munmap, mprotect.

Our target doesn't has all underlying support it needs. My question is:
what's the minimum requirement to port Safe Stack to bare metal?

Thanks,
Zhaoshi
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I also looked at shadow call stack and got myself very confused:
Why does is require common sanitizer support? so that it can be checked by clang
that the only valid target is AArch64 when -fsanitize=shadow-call-stack is
present?

Thanks,
Zhaoshi


From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Zhaoshi
Zheng via llvm-dev
Sent: Monday, March 16, 2020 09:52
To: llvm-dev at lists.llvm.org
Subject: [EXT] [llvm-dev] Enable Safe Stack for Baremetal?

Hello,

I'm assessing the work required to enable Safe Stack for a bare metal
target.
Looking at compiler-rt/lib/safestack/, the current implementation depends on
thread support for mutex & storing unsafe stack pointer.
It also need several system calls: gettid, tgkill, mmap, munmap, mprotect.

Our target doesn't has all underlying support it needs. My question is:
what's the minimum requirement to port Safe Stack to bare metal?

Thanks,
Zhaoshi
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