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Add torture test for zipos file descriptors

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This change hardens the code for opening /zip/ files using the system
call interface. Thread safety and signal safety has been improved for
file descriptors in general. We now document fixed addresses that are
needed for low level allocations.
This commit is contained in:
Justine Tunney 2022-06-15 16:19:50 -07:00
parent 579080cd4c
commit e466dd0553
44 changed files with 2981 additions and 307 deletions
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23
libc/log/backtrace2.c
View file

@ -21,7 +21,9 @@
#include "libc/bits/safemacros.internal.h"
#include "libc/bits/weaken.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/strace.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/calls/syscall_support-sysv.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
@ -82,6 +84,7 @@ static int PrintBacktraceUsingAddr2line(int fd, const struct StackFrame *bp) {
}
// backtrace_test.com failing on windows for some reason via runitd
// don't want to pull in the high-level syscalls here anyway
if (IsWindows()) {
return -1;
}
@ -118,17 +121,17 @@ static int PrintBacktraceUsingAddr2line(int fd, const struct StackFrame *bp) {
j += uint64toarray_radix16(addr - 1, buf + j) + 1;
}
argv[i++] = NULL;
pipe(pipefds);
if (sys_pipe(pipefds) == -1) return -1;
if (!(pid = vfork())) {
dup2(pipefds[1], 1);
if (pipefds[0] != 1) close(pipefds[0]);
if (pipefds[1] != 1) close(pipefds[1]);
execve(addr2line, argv, environ);
_exit(127);
sys_dup2(pipefds[1], 1);
if (pipefds[0] != 1) sys_close(pipefds[0]);
if (pipefds[1] != 1) sys_close(pipefds[1]);
sys_execve(addr2line, argv, environ);
_Exit(127);
}
close(pipefds[1]);
sys_close(pipefds[1]);
for (;;) {
got = read(pipefds[0], buf, kBacktraceBufSize);
got = sys_read(pipefds[0], buf, kBacktraceBufSize);
if (!got) break;
if (got == -1 && errno == EINTR) {
errno = 0;
@ -161,8 +164,8 @@ static int PrintBacktraceUsingAddr2line(int fd, const struct StackFrame *bp) {
}
}
}
close(pipefds[0]);
while (waitpid(pid, &ws, 0) == -1) {
sys_close(pipefds[0]);
while (sys_wait4(pid, &ws, 0, 0) == -1) {
if (errno == EINTR) continue;
return -1;
}