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Improve pledge() usability and consistency

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- We now kill the program on violations like OpenBSD
- We now print a message explaining which promise is needed
- This change also fixes a linkage bug with thread local storage
- Your sigaction() handlers should now be more thread safe

A new `__pledge_mode` global has been introduced to make pledge() more
customizable on Linux. For example:

    __attribute__((__constructor__)) static void init(void) {
      __pledge_mode = SECCOMP_RET_ERRNO | EPERM;
    }

Can be used to restore our old permissive pledge() behavior.
This commit is contained in:
Justine Tunney 2022-08-07 16:18:33 -07:00
parent 13c1c45075
commit 5546559034
30 changed files with 713 additions and 86 deletions
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2
libc/sysv/calls/sys_syslog.s Normal file
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.include "o/libc/sysv/macros.internal.inc"
.scall sys_syslog,0xfffffffffffff067,globl,hidden

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libc/sysv/calls/syslog.s
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@ -1,2 +0,0 @@
.include "o/libc/sysv/macros.internal.inc"
.scall syslog,0xfffffffffffff067,globl