Messages in this thread | ![/](/images/icornerl.gif) | | From | Alexey Dobriyan <> | Date | Sun, 12 Dec 2021 09:38:54 +0200 | Subject | Re: [PATCH] fs/binfmt_elf.c: disallow zero entry point address |
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On 12/11/21, H.J. Lu <hjl.tools@gmail.com> wrote: > According to gABI, the entry point address in the ELF header gives the > virtual address to which the system first transfers control, thus > starting the process. If the file has no associated entry point, this > member holds zero. Update the ELF loader to disallow an ELF binary > with zero entry point address. This fixes: > > https://bugzilla.kernel.org/show_bug.cgi?id=215303 > > Tested by booting Fedora 35 and running a shared library with zero entry > point address: > > $ readelf -h load.so | grep "Entry point address:" > Entry point address: 0x0 > $ ./load.so > bash: ./load.so: cannot execute binary file: Exec format error
Why not let it segfault?
> + if (elf_ex->e_entry == 0) > + goto out;
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