Bug 340253 – dev-libs/libtar _FORTIFY_SOURCE indicates presence of overflow

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Diego Elio Pettenò (RETIRED) 2010-10-09 12:16:01 UTC]

You're receiving this bug because the package in Summary has produced _FORTIFY_SOURCE related warnings indicating the presence of a sure overflow in a static buffer.

Even though this is not always an indication of a security problem it might even be. So please check this out ASAP.

By the way, _FORTIFY_SOURCE is disabled when you disable optimisation, so don't try finding out the cause using -O0.

Thanks,
Your friendly neighborhood tinderboxer

[Comment 1 Diego Elio Pettenò (RETIRED) 2010-10-09 12:16:13 UTC]

Created attachment 250013 [details]
Build log

[Comment 2 Kevin McCarthy (RETIRED) 2011-01-29 19:56:58 UTC]

Created attachment 261035 [details, diff]
Fix buffer overflow on ustar magic field

[Comment 3 Kevin McCarthy (RETIRED) 2011-01-29 19:57:25 UTC]

Created attachment 261036 [details]
ebuild to apply the magic overflow patch

[Comment 4 Kevin McCarthy (RETIRED) 2011-01-29 20:00:43 UTC]

In encode.c there was an attempt to strncpy the 8 character string "ustar  " into a 6 character field in the ustar header. The ustar format calls for a 6 character field that contains "ustar" terminated by a null, so I've changed it to that.

[Comment 5 Samuli Suominen (RETIRED) 2011-02-11 21:10:23 UTC]

applied in -r4