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authorphilhofer <phofer@umich.edu>2018-12-18 21:02:24 -0800
committerWilliam Hubbs <w.d.hubbs@gmail.com>2018-12-27 11:28:27 -0600
commit846e4600754dab3f0cb49edb4ad9e2b2b73d3f47 (patch)
tree037e9c5f49a983a7d92bca78ebdd074087ecdbf0 /src/rc/Makefile
parenta32b14bbb43e9888acaaea6f764fb8dcb34fb941 (diff)
fix potential out-of-bounds reads
readlink(3) does not nul-terminate the result it sticks into the supplied buffer. Consequently, the code rc = readlink(path, buf, sizeof(buf)); does not necessarily produce a C string. The code in rc_find_pid() produces some C strings this way and passes them to strlen() and strcmp(), which can lead to an out-of-bounds read. In this case, since the code already takes care to zero-initialize the buffers before passing them to readlink(3), only allow sizeof(buf)-1 bytes to be returned. (While fixing this issue, I fixed two other locations that used the same problematic pattern.) This fixes #270.
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