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Rewrite Linux pledge() code so it can be a payload

Browse source 
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
This commit is contained in:
Justine Tunney 2022-08-08 11:41:08 -07:00
parent 7bd4179b9b
commit 0277d7d6e9
37 changed files with 1980 additions and 1600 deletions
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2
libc/sysv/calls/memfd_create.s
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@ -1,2 +0,0 @@
.include "o/libc/sysv/macros.internal.inc"
.scall memfd_create,0xfffffffffffff13f,globl

2
libc/sysv/calls/sys_memfd_create.s Normal file
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@ -0,0 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_memfd_create,0xfffffffffffff13f,globl,hidden

8
libc/sysv/consts.sh
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@ -417,14 +417,6 @@ syscon at AT_REMOVEDIR 0x0200 0x80 0x0800 8 0x800 0x0200 # faked
syscon at AT_EACCESS 0x0200 0x10 0x0100 1 0x100 0 # performs check using effective uid/gid; unnecessary nt
syscon at AT_EMPTY_PATH 0x1000 0 0 0 0 0 # linux 2.6.39+; see unlink, O_TMPFILE, etc.
# memfd_create() flags
#
# Unsupported flags are encoded as 0.
#
# group name GNU/Systemd XNU's Not UNIX! FreeBSD OpenBSD NetBSD The New Technology Commentary
syscon memfd MFD_CLOEXEC 1 0 0 0 0 0
syscon memfd MFD_ALLOW_SEALING 2 0 0 0 0 0
# utimensat() special values
#
# group name GNU/Systemd XNU's Not UNIX! FreeBSD OpenBSD NetBSD The New Technology Commentary

2
libc/sysv/consts/CANBSIZ.S
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@ -1,2 +0,0 @@
#include "libc/sysv/consts/syscon.internal.h"
.syscon termios,CANBSIZ,255,0,0,0,0,0

2
libc/sysv/consts/IPPORT_RESERVED.S
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@ -1,2 +0,0 @@
#include "libc/sysv/consts/syscon.internal.h"
.syscon misc,IPPORT_RESERVED,0x0400,0x0400,0x0400,0x0400,0x0400,0x0400

2
libc/sysv/consts/MFD_ALLOW_SEALING.S
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@ -1,2 +0,0 @@
#include "libc/sysv/consts/syscon.internal.h"
.syscon memfd,MFD_ALLOW_SEALING,2,0,0,0,0,0

2
libc/sysv/consts/MFD_CLOEXEC.S
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@ -1,2 +0,0 @@
#include "libc/sysv/consts/syscon.internal.h"
.syscon memfd,MFD_CLOEXEC,1,0,0,0,0,0

13
libc/sysv/consts/mfd.h
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@ -1,16 +1,7 @@
#ifndef COSMOPOLITAN_LIBC_SYSV_CONSTS_MFD_H_
#define COSMOPOLITAN_LIBC_SYSV_CONSTS_MFD_H_
#include "libc/runtime/symbolic.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
extern const unsigned int MFD_CLOEXEC;
extern const unsigned int MFD_ALLOW_SEALING;
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#define MFD_CLOEXEC SYMBOLIC(MFD_CLOEXEC)
#define MFD_ALLOW_SEALING SYMBOLIC(MFD_ALLOW_SEALING)
#define MFD_CLOEXEC 1
#define MFD_ALLOW_SEALING 2
#endif /* COSMOPOLITAN_LIBC_SYSV_CONSTS_MFD_H_ */

2
libc/sysv/syscalls.sh
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@ -350,7 +350,7 @@ scall sched_getattr 0xfffffffffffff13b globl # ├─ karen sandler requires s
scall renameat2 0xfffffffffffff13c globl # └─ debian founder ian murdock found strangled with vacuum cord
#scall seccomp 0xfffffffffffff13d globl # wrapped manually
scall sys_getrandom 0xfff00723321f413e globl hidden # Linux 3.17+ and getentropy() on XNU/OpenBSD, coming to NetBSD in 9.2
scall memfd_create 0xfffffffffffff13f globl # wut
scall sys_memfd_create 0xfffffffffffff13f globl hidden
scall kexec_file_load 0xfffffffffffff140 globl
scall bpf 0xfffffffffffff141 globl
scall execveat 0xfffffffffffff142 globl