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Stop logging stack contents when reading a zero-length bandwidth file

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When directory authorities read a zero-byte bandwidth file, they log
a warning with the contents of an uninitialised buffer. Log a warning
about the empty file instead.

Fixes bug 26007; bugfix on 0.2.2.1-alpha.
This commit is contained in:
teor 2018-05-02 22:33:21 +10:00 • committed by juga0
parent 34e7dca9c9
commit 867fe40f91
2 changed files with 16 additions and 2 deletions
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5
changes/bug26007 Normal file
View file

@ -0,0 +1,5 @@
o Major bugfixes (directory authorities, security):
- When directory authorities read a zero-byte bandwidth file, they log
a warning with the contents of an uninitialised buffer. Log a warning
about the empty file instead.
Fixes bug 26007; bugfix on 0.2.2.1-alpha.

13
src/or/dirserv.c
View file

@ -2750,14 +2750,23 @@ dirserv_read_measured_bandwidths(const char *from_file,
time_t file_time, now;
int ok;
/* Initialise line, so that we can't possibly run off the end. */
memset(line, 0, sizeof(line));
if (fp == NULL) {
log_warn(LD_CONFIG, "Can't open bandwidth file at configured location: %s",
from_file);
return -1;
}
if (!fgets(line, sizeof(line), fp)
|| !strlen(line) || line[strlen(line)-1] != '\n') {
/* If fgets fails, line is either unmodified, or indeterminate. */
if (!fgets(line, sizeof(line), fp)) {
log_warn(LD_DIRSERV, "Empty bandwidth file");
fclose(fp);
return -1;
}
if (!strlen(line) || line[strlen(line)-1] != '\n') {
log_warn(LD_DIRSERV, "Long or truncated time in bandwidth file: %s",
escaped(line));
fclose(fp);