On 09Dec2011 17:36, Dean S. Messing <deanm@xxxxxxxxxxxxx> wrote: | I have a little suid mystery that perhaps someone would | kindly help me solve. I just discovered that the files and | symlinks in | /usr/lib64/mozilla/plugins-wrapped | get their "Modify time" updated each time I start firefox | as me (not root). I just re-started firefox (at 17:19) | and here is 'ls -l' of one of the files in the above dir: | | -rwxr-xr-x 1 root avdt 140440 Dec 9 17:19 nswrapper_64_64.libflashplayer.so* | | Now, I'm in group "avdt" so it is clearly "me" that | updated (or first created) this file. Yet the above | directory has these perms and ownership: | | drwxr-xr-x 2 root root | | Since neither the directory, nor the files have | group write permission, it seems that firefox must be suid | root in order to modify these files (if I understand | correctly). But neither the shell script | "/usr/bin/firefox", nor the executable that (I think) it | calls "/usr/lib64/firefox/firefox" has the SUID bit (nor | the SGID bit) set in its perms. | | So how can it update these files? I did not think that firefox could | touch any of my "system" stuff. It shouldn't be able to, IIUC. How are you starting firefox? From the command line by running /usr/bin/firefox? Even if not, it would be a useful test. Run that, see if the timestamps change. You can also do this: strace -o str.out -e trace=file -f /usr/bin/firefox Invoke firefox that way, watch the timestamps. When they change, quit firefox and look at the str.out file to see if firefox is touching this stuff. Cheers, -- Cameron Simpson <cs@xxxxxxxxxx> DoD#743 http://www.cskk.ezoshosting.com/cs/ Those who do not understand Unix are condemned to reinvent it, poorly. - Henry Spencer @ U of Toronto Zoology, henry@xxxxxxxxxxxxxxx -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
