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Re: make COMPAT_LINUX match SYSV binaries writes:

> I feel compelled to explain further:
> any OS that doesn't rely on this tag is prone to spitting out binaries
> with the wrong tag. For example, Go spits out Solaris binaries with SYSV
> as well.
> Our current solution to it is the kernel reading through the binary,
> checking if it contains certain known symbols that are common on Linux.
> We support the following forms of compat:
> ultrix			not ELF
> sunos			not ELF (we support only oooooold stuff)
> freebsd			always correctly tagged, because the native OS
> 			checks this, like we do.
> linux			ELF, not always correctly tagged
> So, currently, we only support one OS that has this problem, which is
> linux. I am proposing we take advantage of it.
> In the event someone adds support for another OS with this problem (say,
> modern Solaris), I don't expect this compat to be enabled by default,
> for security reasons. So the problem will only occur if a user enables
> both forms of compat at the same time.
> Users already have to opt in to have Linux compat support. I think it is
> a lot to ask to have them tag every binary.

Thanks for the explanation.  I'm still not thrilled, but I withdraw my

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