Hi Joshua, Joshua Kinard wrote, > I think I've run into a rather odd bug on a big-endian MIPS platform while > trying to hand-assemble a MIPS-II ISA netboot image built from a uclibc-ng > chroot. In my netboot, I need to include xfsprogs, but this has a dependency > on the 'valloc' function call. So in uclibc-ng, I enabled > CONFIG_UCLIBC_SUSV2_LEGACY to enable that function, and rebuilt uclibc-ng. > This fixes the xfsprogs build, but it very subtly breaks busybox's ash shell. > > After rebuilding uclibc-ng, then rebuilding busybox statically/multicall, if > you run /bin/ash with a malformed argument or give it a script to execute that > doesn't have the execute bit set, you get a SIGSEGV: > > Fudging up the argument syntax to /bin/ash: > octane / # /bin/ash "-c" > /bin/ash: -c requires an argument > Segmentation fault > > Via a non-executable script "x.sh", we start with this sample: > octane / # cat ./x.sh > #!/bin/ash > echo "foo!" > > If "x.sh" has the executable bit set, we're all good: > octane / # ls -l ./x.sh > -rwxr-xr-x 1 root root 24 Oct 12 01:57 ./x.sh > octane / # /bin/ash -c ./x.sh > foo! > > But if we turn off the executable bit... > octane / # chmod -x ./x.sh > octane / # ls -l ./x.sh > -rw-r--r-- 1 root root 24 Oct 12 01:57 ./x.sh > octane / # /bin/ash -c ./x.sh > /bin/ash: ./x.sh: Permission denied > Segmentation fault
After sorting out my last bootup problems (missing N32/O32 binary support in the kernel), I can confirm that the bug is fixed in uCLibc-ng 1.0.19: root@openadk:/root # ash -c /tmp/c.sh ash: /tmp/c.sh: Permission denied root@openadk:/root # chmod 755 . root@openadk:/root # chmod 755 /tmp/c.sh root@openadk:/root # ash -c /tmp/c.sh foo! root@openadk:/root # ash -c ash: -c requires an argument root@openadk:/root # ls /lib Please update to 1.0.19, thanks Waldemar _______________________________________________ devel mailing list devel@uclibc-ng.org http://mailman.uclibc-ng.org/cgi-bin/mailman/listinfo/devel
