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The offsets specify the ends of variable length data. We would trust the incoming data, putting the offsets specified in our message into the offsets tables after doing some superficial verification. But when actually reading the data we apply alignment, so we would take the previous offset, align it, making it bigger then current offset, and then we'd try to read data of negative length. In the attached example, the message specifies the following offsets: [1, 4] but the alignment of those items is [1, 8] so we'd calculate the second item as starting at 8 and ending at 4. (cherry picked from commit 12603b84d2fb07603e2ea94b240c6b78ad17510e) (cherry picked from commit a1e18bfc5b7b624a91af15f252b834742a855c93)
The extended testsuite only works with uid=0. It contains of several subdirectories named "test/TEST-??-*", which are run one by one. To run the extended testsuite do the following: $ make all # Avoid the "sudo make" below building anything as root $ cd test $ sudo make clean check ... make[1]: Entering directory `/mnt/data/harald/git/systemd/test/TEST-01-BASIC' Making all in . Making all in po TEST: Basic systemd setup [OK] make[1]: Leaving directory `/mnt/data/harald/git/systemd/test/TEST-01-BASIC' ... If one of the tests fails, then $subdir/test.log contains the log file of the test. To debug a special testcase of the testsuite do: $ make all $ cd test/TEST-01-BASIC $ sudo make clean setup run QEMU ==== If you want to log in the testsuite virtual machine, you can specify additional kernel command line parameter with $KERNEL_APPEND. $ sudo make KERNEL_APPEND="systemd.unit=multi-user.target" clean setup run you can even skip the "clean" and "setup" if you want to run the machine again. $ sudo make KERNEL_APPEND="systemd.unit=multi-user.target" run You can specify a different kernel and initramfs with $KERNEL_BIN and $INITRD. (Fedora's or Debian's default kernel path and initramfs are used by default) $ sudo make KERNEL_BIN=/boot/vmlinuz-foo INITRD=/boot/initramfs-bar clean check A script will try to find your QEMU binary. If you want to specify a different one you can use $QEMU_BIN. $ sudo make QEMU_BIN=/path/to/qemu/qemu-kvm clean check