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Fix --ftrace with cosmo_dlopen()

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This change ensures function call logging won't crash the process when
cosmo_dlopen() is called.
This commit is contained in:
Justine Tunney 2024-01-05 15:11:37 -08:00
parent 15548b523c
commit 2d93788ce3
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GPG key ID: BE714B4575D6E328
8 changed files with 35 additions and 7 deletions
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2
libc/dlopen/dlopen.c
View file

@ -291,7 +291,7 @@ static wontreturn dontinstrument void foreign_helper(void **p) {
__foreign.dlsym = p[1];
__foreign.dlclose = p[2];
__foreign.dlerror = p[3];
longjmp(__foreign.jb, 1);
_longjmp(__foreign.jb, 1);
}
static dontinline void elf_exec(const char *file, char **envp) {

3
libc/nexgen32e/longjmp.S
View file

@ -28,6 +28,7 @@
.ftrace1
longjmp:
.ftrace2
_longjmp:
#ifdef __x86_64__
mov %esi,%eax
test %eax,%eax
@ -61,5 +62,5 @@ longjmp:
#error "unsupported architecture"
#endif
.endfn longjmp,globl
.alias longjmp,_longjmp
.endfn _longjmp,globl
.alias longjmp,siglongjmp

26
libc/runtime/set_tls-sysv.S Normal file
View file

@ -0,0 +1,26 @@
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│ vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2024 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.internal.h"
// we can't allow ftrace here since ftrace needs tls
sys_set_tls:
mov __NR_set_tls(%rip),%eax
syscall
ret
.endfn sys_set_tls,globl

5
libc/runtime/set_tls.c
View file

@ -28,12 +28,13 @@
int sys_set_tls();
textstartup void __set_tls(struct CosmoTib *tib) {
// we can't allow --ftrace here because cosmo_dlopen() calls this
// function to fix the tls register, and ftrace needs it unbroken
dontinstrument textstartup void __set_tls(struct CosmoTib *tib) {
tib = __adj_tls(tib);
#ifdef __x86_64__
// ask the operating system to change the x86 segment register
if (IsWindows()) {
npassert(0 <= __tls_index && __tls_index < 64);
asm("mov\t%1,%%gs:%0" : "=m"(*((long *)0x1480 + __tls_index)) : "r"(tib));
} else if (IsFreebsd()) {
sys_set_tls(129 /*AMD64_SET_FSBASE*/, tib);

2
libc/sysv/calls/sys_set_tls.S
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@ -1,2 +0,0 @@
#include "libc/sysv/macros.internal.h"
.scall sys_set_tls,0x13d1490a5300309e,4095,3,165,globl,hidden

1
libc/sysv/consts.sh
View file

@ -1725,6 +1725,7 @@ syscon nr __NR_ioperm 0x00ad 0x0fff 0xfff 0xfff 0xfff 0xfff 0xfff
syscon nr __NR_init_module 0x00af 0x0069 0xfff 0xfff 0xfff 0xfff 0xfff 0xfff
syscon nr __NR_delete_module 0x00b0 0x006a 0xfff 0xfff 0xfff 0xfff 0xfff 0xfff
syscon nr __NR_gettid 0x00ba 0x00b2 0x100001b 0xfff 432 299 311 0xfff # TODO(jart): thread_self_trap vs. gettid?
syscon nr __NR_set_tls 0x009e 0xfff 0x3000003 0xfff 0x00a5 0x0149 0x13d 0xfff
syscon nr __NR_readahead 0x00bb 0x00d5 0xfff 0xfff 0xfff 0xfff 0xfff 0xfff
syscon nr __NR_setxattr 0x00bc 0x0005 0x20000ec 0x00ec 0xfff 0xfff 0x177 0xfff
syscon nr __NR_fsetxattr 0x00be 0x0007 0x20000ed 0x00ed 0xfff 0xfff 0x179 0xfff

2
libc/sysv/consts/__NR_set_tls.S Normal file
View file

@ -0,0 +1,2 @@
#include "libc/sysv/consts/syscon.internal.h"
.syscon nr,__NR_set_tls,0x009e,0xfff,0x3000003,0xfff,0x00a5,0x0149,0x13d,0xfff

1
libc/sysv/syscalls.sh
View file

@ -201,7 +201,6 @@ scall sys_modify_ldt 0xfffffffffffff09a 0xfff globl # no wrapper
scall sys_pivot_root 0xfffffffffffff09b 0x029 globl hidden
#scall prctl 0xfffffffffffff09d 0x0a7 globl # wrapped manually
scall sys_arch_prctl 0x0a50a50a5ffff09e 0xfff globl hidden # sysarch() on bsd
scall sys_set_tls 0x13d1490a5300309e 0xfff globl hidden # arch_prctl on linux, sysarch on freebsd, _lwp_setprivate on netbsd, __set_tcb on openbsd, _lwp_setprivate on netbsd, thread_fast_set_cthread_self on xnu
scall sys_adjtimex 0xfffffffffffff09f 0x0ab globl # no wrapper
scall sys_swapon 0xffffff05520550a7 0x0e0 globl # no wrapper
scall sys_swapoff 0xffffff1a8ffff0a8 0x0e1 globl # no wrapper