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Make _SC_OPEN_MAX actually get used when closing fds before exec.

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Fixes bug 8209; bugfix on 0.2.3.1-alpha.
This commit is contained in:
Nick Mathewson 2013-02-11 16:27:35 -05:00
parent fc35ee4910
commit da6720e9fa
2 changed files with 9 additions and 2 deletions
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6
changes/bug8209 Normal file
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@ -0,0 +1,6 @@
o Minor bugfixes:
- When detecting the largest possible file descriptor (in order to close
all file descriptors when launching a new program), actually use
_SC_OPEN_MAX. The old code for doing this was very, very broken.
Fix for bug 8209; bugfix on 0.2.3.1-alpha. Found by Coverity; this
is CID 743383.

5
src/common/util.c
View File

@ -3834,12 +3834,13 @@ tor_spawn_background(const char *const filename, const char **argv,
child_state = CHILD_STATE_MAXFD;
#ifdef _SC_OPEN_MAX
if (-1 != max_fd) {
if (-1 == max_fd) {
max_fd = (int) sysconf(_SC_OPEN_MAX);
if (max_fd == -1)
if (max_fd == -1) {
max_fd = DEFAULT_MAX_FD;
log_warn(LD_GENERAL,
"Cannot find maximum file descriptor, assuming %d", max_fd);
}
}
#else
max_fd = DEFAULT_MAX_FD;