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Improve signals and memory protection

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- Document sigaction()
- Simplify New Technology fork() code
- Testing and many bug fixes for mprotect()
- Distribute Intel Xed ILD in the amalgamation
- Turn Xed enums into defines to avoid DWARF bloat
- Improve polyfilling of SA_SIGINFO on BSDs and fix bugs
- setpgid(getpid(), getpid()) on Windows will ignore CTRL-C
- Work around issues relating to NT mappings being executable
- Permit automatic executable stack override via `ape_stack_pf`
This commit is contained in:
Justine Tunney 2022-04-12 22:11:00 -07:00
parent c95c9d9508
commit f684e348d4
76 changed files with 1844 additions and 1121 deletions
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34
ape/ape.S
View file

@ -660,6 +660,7 @@ apesh: .ascii "'\n#'\"\n" # sixth edition shebang
#if SupportsSystemv() || SupportsMetal()
.section .elf.phdrs,"a",@progbits
.long PT_LOAD
.long PF_R|PF_X
.stub ape_rom_offset,quad
@ -668,6 +669,7 @@ apesh: .ascii "'\n#'\"\n" # sixth edition shebang
.stub ape_rom_filesz,quad
.stub ape_rom_memsz,quad
.stub ape_rom_align,quad
.long PT_LOAD
.long PF_R|PF_W
.stub ape_ram_offset,quad
@ -676,14 +678,32 @@ apesh: .ascii "'\n#'\"\n" # sixth edition shebang
.stub ape_ram_filesz,quad
.stub ape_ram_memsz,quad
.stub ape_ram_align,quad
// APE Stack Configuration
//
// We actually respect this when allocating a deterministically
// addressed stack on Windows and other operating systems. However
// there's a few caveats:
//
// - If ape_stack_pf has PF_X then OpenBSD probably won't work
// - We don't bother creating a deterministic stack in MODE=tiny
//
// With that said, here's some examples of configuration:
//
// STATIC_SYMBOL("ape_stack_pf", "7"); // RWX
// STATIC_STACK_ADDR(0x6fffffff0000);
// STATIC_STACK_SIZE(65536);
//
// @see ape.lds for defaults
.long PT_GNU_STACK
.long PF_R|PF_W
.stub ape_stack_offset,quad
.stub ape_stack_vaddr,quad
.stub ape_stack_paddr,quad
.stub ape_stack_filesz,quad
.stub ape_stack_memsz,quad
.stub ape_stack_align,quad
.stub ape_stack_pf,long # override w/ PF_X for execstack
.stub ape_stack_offset,quad # ignored
.stub ape_stack_vaddr,quad # is mmap()'d with MAP_FIXED
.stub ape_stack_paddr,quad # ignored
.stub ape_stack_filesz,quad # ignored
.stub ape_stack_memsz,quad # is mmap(size) argument
.stub ape_stack_align,quad # must be 16+
#if SupportsOpenbsd() || SupportsNetbsd()
.long PT_NOTE
.long PF_R

4
ape/ape.lds
View file

@ -177,6 +177,8 @@
#include "ape/macros.internal.h"
#include "ape/relocations.h"
#include "libc/dce.h"
#include "libc/elf/def.h"
#include "libc/elf/pf2prot.internal.h"
#include "libc/nt/pedef.internal.h"
#include "libc/zip.h"
@ -505,6 +507,8 @@ HIDDEN(ape_ram_memsz = ADDR(.bss) + SIZEOF(.bss) - ape_ram_vaddr);
HIDDEN(ape_ram_align = PAGESIZE);
HIDDEN(ape_ram_rva = RVA(ape_ram_vaddr));
HIDDEN(ape_stack_pf = DEFINED(ape_stack_pf) ? ape_stack_pf : PF_R | PF_W);
HIDDEN(ape_stack_prot = _PF2PROT(ape_stack_pf));
HIDDEN(ape_stack_offset = ape_ram_offset + ape_ram_filesz);
HIDDEN(ape_stack_vaddr = DEFINED(ape_stack_vaddr) ? ape_stack_vaddr : 0x700000000000 - STACKSIZE);
HIDDEN(ape_stack_paddr = ape_ram_paddr + ape_ram_filesz);