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mdbx: more logging for FD < STDERR_FILENO.

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More for https://github.com/erthink/libmdbx/issues/144

Change-Id: I8dcd3cab8a39b16a1836c88ec92b30d6b0de8b51
This commit is contained in:
Leonid Yuriev 2020-12-06 14:35:35 +03:00
parent c4944a58d5
commit a4df0acb00
1 changed files with 22 additions and 3 deletions

25
src/osal.c

@ -678,12 +678,21 @@ MDBX_INTERNAL_FUNC int mdbx_openfile(const enum mdbx_openfile_purpose purpose,
#if STDIN_FILENO == 0 && STDOUT_FILENO == 1 && STDERR_FILENO == 2
int stub_fd0 = -1, stub_fd1 = -1, stub_fd2 = -1;
static const char dev_null[] = "/dev/null";
if (!is_valid_fd(STDIN_FILENO))
if (!is_valid_fd(STDIN_FILENO)) {
mdbx_warning("STD%s_FILENO/%d is invalid, open %s for temporary stub", "IN",
STDIN_FILENO, dev_null);
stub_fd0 = open(dev_null, O_RDONLY | O_NOCTTY);
if (!is_valid_fd(STDOUT_FILENO))
}
if (!is_valid_fd(STDOUT_FILENO)) {
mdbx_warning("STD%s_FILENO/%d is invalid, open %s for temporary stub",
"OUT", STDOUT_FILENO, dev_null);
stub_fd1 = open(dev_null, O_WRONLY | O_NOCTTY);
if (!is_valid_fd(STDERR_FILENO))
}
if (!is_valid_fd(STDERR_FILENO)) {
mdbx_warning("STD%s_FILENO/%d is invalid, open %s for temporary stub",
"ERR", STDERR_FILENO, dev_null);
stub_fd2 = open(dev_null, O_WRONLY | O_NOCTTY);
}
#else
#error "Unexpected or unsupported UNIX or POSIX system"
#endif /* STDIN_FILENO == 0 && STDERR_FILENO == 2 */
@ -700,14 +709,20 @@ MDBX_INTERNAL_FUNC int mdbx_openfile(const enum mdbx_openfile_purpose purpose,
/* Safeguard for https://github.com/erthink/libmdbx/issues/144 */
#if STDIN_FILENO == 0 && STDOUT_FILENO == 1 && STDERR_FILENO == 2
if (*fd == STDIN_FILENO) {
mdbx_warning("Got STD%s_FILENO/%d, avoid using it by dup(fd)", "IN",
STDIN_FILENO);
assert(stub_fd0 == -1);
*fd = dup(stub_fd0 = *fd);
}
if (*fd == STDOUT_FILENO) {
mdbx_warning("Got STD%s_FILENO/%d, avoid using it by dup(fd)", "OUT",
STDOUT_FILENO);
assert(stub_fd1 == -1);
*fd = dup(stub_fd1 = *fd);
}
if (*fd == STDERR_FILENO) {
mdbx_warning("Got STD%s_FILENO/%d, avoid using it by dup(fd)", "ERR",
STDERR_FILENO);
assert(stub_fd2 == -1);
*fd = dup(stub_fd2 = *fd);
}
@ -718,6 +733,10 @@ MDBX_INTERNAL_FUNC int mdbx_openfile(const enum mdbx_openfile_purpose purpose,
if (stub_fd2 != -1)
close(stub_fd2);
if (*fd >= STDIN_FILENO && *fd <= STDERR_FILENO) {
mdbx_error(
"Rejecting the use of a FD in the range "
"STDIN_FILENO/%d..STDERR_FILENO/%d to prevent database corruption",
STDIN_FILENO, STDERR_FILENO);
close(*fd);
return EBADF;
}