On Fri, 22 Oct 2004, Andriy Gapon wrote: > Under Linux emulation "/" resolves to real root directory, not > /compat/linux directory and I am very curious why this is so. > > I see that in linux_emul_convpath() there is a special check for this > case with the following comment: > > /* > * We now compare the vnode of the linux_root to the one > * vnode asked. If they resolve to be the same, then we > * ignore the match so that the real root gets used. > * This avoids the problem of traversing "../.." to find the > * root directory and never finding it, because "/" resolves > * to the emulation root directory. This is expensive :-( > */ > > > Because of such behavior "mkdir -p" (in linux base 7) is broken in cases > where more than one path components needs to be created - mkdir first > chdir()s to / and then iteratively mkdir()s and chdir()s to subdirectories. > > My rationale for throwing out that check is that no linux program should > ever need to access real root directory, and in case of a user using an > interactive linux shell he should be smart enough to break out of > /compat/linux (very easy). > > I have already posted this question to freebsd-emulation list, but got > no responses so far. Linux binaries often need to access files outside the emulation directory tree, just think of data files in the user's homes when running applications like acroread, linux-mozilla, staroffice etc. So you absolutely need to break out. Regards Konrad Heuer GWDG, Am Fassberg, 37077 Goettingen, Germany, kheuer2_at_gwdg.deReceived on Fri Oct 22 2004 - 09:18:54 UTC
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