logging: do not read more that the buf size#361
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sd_journal_sendv returns a negative errno, so negate it before usage. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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@giuseppe one lint issue https://github.com/containers/conmon/pull/361/checks?check_run_id=9269929279 otherwise LGTM, thanks for taking this on |
msg_len doesn't take into account NUL bytes that could be present in
the buffer, while g_strdup_printf("MESSAGE=%s%s", partial_buf, buf)
does and would stop writing the string once it finds a NUL byte. This
would lead to read after the buffer end.
Build the message string manually so that the calculated length
reflects the buffer size.
Closes: containers#315
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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Thanks! I can't reproduce that issue anymore. I also wrote a (half-baked) fuzz target and it hasn't been able to find anything else either so far. Unfortunately OSS-Fuzz makes it extremely hard to add fuzz targets with external dependencies like |
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msg_len doesn't take into account NUL bytes that could be present in
the buffer, while g_strdup_printf("MESSAGE=%s%s", partial_buf, buf)
does and would stop writing the string once it finds a NUL byte. This
would lead to read after the buffer end.
Build the message string manually so that the calculated length
reflects the buffer size.
Closes: #315
Signed-off-by: Giuseppe Scrivano gscrivan@redhat.com