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d1d4388201
It hasn't been helpful enough to be justify the maintenance burden. What actually does help is mprotect(), kprintf(), --ftrace and --strace which can always be counted upon to work correctly. We aren't losing much with this change. Support for ASAN on AARCH64 was never implemented. Applying ASAN to the core libc runtimes was disabled many months ago. If there is some way to have an ASAN runtime for user programs that is less invasive we can potentially consider reintroducing support. But now is premature.
78 lines
3.5 KiB
C
78 lines
3.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/dce.h"
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#include "libc/limits.h"
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#include "libc/mem/alloca.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/stack.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Executes program, with path environment search.
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*
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* This function is a wrapper of the execve() system call that does path
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* resolution. The `PATH` environment variable is taken from your global
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* `environ` rather than the `envp` argument.
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*
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* @param prog is the program to launch
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* @param argv is [file,argv₁..argvₙ₋₁,NULL]
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* @param envp is ["key=val",...,NULL]
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* @return doesn't return on success, otherwise -1 w/ errno
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* @asyncsignalsafe
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* @vforksafe
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*/
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int execvpe(const char *prog, char *const argv[], char *const *envp) {
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size_t i;
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char *exe, **argv2;
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char pathbuf[PATH_MAX];
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if (strchr(prog, '/')) {
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return execve(prog, argv, envp);
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}
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// resolve path of executable
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if (!(exe = commandv(prog, pathbuf, sizeof(pathbuf)))) {
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return -1;
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}
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// change argv[0] to resolved path if it's ambiguous
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// otherwise the program won't have much luck finding itself
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if (argv[0] && *prog != '/' && *exe == '/' && !strcmp(prog, argv[0])) {
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for (i = 0; argv[i++];)
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(void)0;
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#pragma GCC push_options
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#pragma GCC diagnostic ignored "-Walloca-larger-than="
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int nbytes = i * sizeof(*argv);
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if (__get_safe_size(nbytes, 4096) < nbytes)
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return enomem();
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argv2 = alloca(nbytes);
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CheckLargeStackAllocation(argv2, nbytes);
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#pragma GCC pop_options
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memcpy(argv2, argv, nbytes);
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argv2[0] = exe;
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argv = argv2;
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}
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// execute program
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// tail call shouldn't be possible
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return execve(exe, argv, envp);
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}
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