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

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

21
libc/sysv/consts/kern.h Normal file
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@ -0,0 +1,21 @@
#ifndef COSMOPOLITAN_LIBC_SYSV_CONSTS_KERN_H_
#define COSMOPOLITAN_LIBC_SYSV_CONSTS_KERN_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
#define KERN_SOH "\001"
#define KERN_SOH_ASCII '\001'
#define KERN_EMERG KERN_SOH "0"
#define KERN_ALERT KERN_SOH "1"
#define KERN_CRIT KERN_SOH "2"
#define KERN_ERR KERN_SOH "3"
#define KERN_WARNING KERN_SOH "4"
#define KERN_NOTICE KERN_SOH "5"
#define KERN_INFO KERN_SOH "6"
#define KERN_DEBUG KERN_SOH "7"
#define KERN_DEFAULT ""
#define KERN_CONT KERN_SOH "c"
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_SYSV_CONSTS_KERN_H_ */

19
libc/sysv/consts/loglevel.h Normal file
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@ -0,0 +1,19 @@
#ifndef COSMOPOLITAN_LIBC_SYSV_CONSTS_LOGLEVEL_H_
#define COSMOPOLITAN_LIBC_SYSV_CONSTS_LOGLEVEL_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
#define LOGLEVEL_SCHED -2
#define LOGLEVEL_DEFAULT -1
#define LOGLEVEL_EMERG 0
#define LOGLEVEL_ALERT 1
#define LOGLEVEL_CRIT 2
#define LOGLEVEL_ERR 3
#define LOGLEVEL_WARNING 4
#define LOGLEVEL_NOTICE 5
#define LOGLEVEL_INFO 6
#define LOGLEVEL_DEBUG 7
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_SYSV_CONSTS_LOGLEVEL_H_ */

5
libc/sysv/restorert.S
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@ -16,6 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/sysv/consts/nrlinux.h"
#include "libc/macros.internal.h"
.privileged
@ -25,8 +26,8 @@ __restore_bt:
.endfn __restore_bt,globl,hidden
nop # gap so that __get_symbol(st, addr - 1) fails
.align 16
__restore_rt: # @see gdb/amd64-linux-tdep.c
mov $0x000f,%rax # [sic]
__restore_rt: # @see gdb/amd64-linux-tdep.c
mov $__NR_linux_sigreturn,%rax # [sic]
syscall
.align 16
.endfn __restore_rt,globl,hidden

2
libc/sysv/syscalls.sh
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@ -140,7 +140,7 @@ scall __sys_getrusage 0x1bd0130752075062 globl hidden
scall sys_sysinfo 0xfffffffffffff063 globl hidden
scall sys_times 0xfffffffffffff064 globl hidden
scall sys_ptrace 0x01a01a01a201a065 globl hidden
scall syslog 0xfffffffffffff067 globl
scall sys_syslog 0xfffffffffffff067 globl hidden
scall sys_getuid 0x0180180182018066 globl hidden
scall sys_getgid 0x02f02f02f202f068 globl hidden
scall sys_getppid 0xfff027027202706e globl hidden # see sys_getpid()→edx for netbsd