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3 commits

Author SHA1 Message Date
Justine Tunney
625aa365f1 Refactor pledge() to be more configurable 
The earlier iterations did too much guesswork when it came to things
like stderr logging and syscall origin verification. This change will
make things more conformant to existing practices. The __pledge_mode
extension now can be configured in a better way.

There's also a new `-q` flag added to pledge.com, e.g.

    o//tool/build/pledge.com -qv. ls

Is a good way to disable warnings about `tty` access attempts.
 2022-08-11 11:35:30 -07:00
Justine Tunney
0277d7d6e9 Rewrite Linux pledge() code so it can be a payload 
It's now possible to build our pledge() polyfill as a dynamic shared
object that can be injected into a glibc executable using LD_PRELOAD
 2022-08-08 11:41:08 -07:00
Justine Tunney
3d2cf95af1 Remove malloc() dependency on pledge() / unveil() 
This change also fixes a bug with gettid() being incorrect after fork().
We now implement the ENOENT behavior for getauxval(). The getuid() etc.
system calls are now faster too. Plus issetugid() will work on BSDs.
 2022-07-24 21:51:37 -07:00