forked from Minki/linux
60d9ad1d1d
Currently it is necessary for the usermode helper code and the code that launches init to use set_fs so that pages coming from the kernel look like they are coming from userspace. To allow that usage of set_fs to be removed cleanly the argument copying from userspace needs to happen earlier. Move the computation of bprm->filename and possible allocation of a name in the case of execveat into alloc_bprm to make that possible. The exectuable name, the arguments, and the environment are copied into the new usermode stack which is stored in bprm until exec passes the point of no return. As the executable name is copied first onto the usermode stack it needs to be known. As there are no dependencies to computing the executable name, compute it early in alloc_bprm. As an implementation detail if the filename needs to be generated because it embeds a file descriptor store that filename in a new field bprm->fdpath, and free it in free_bprm. Previously this was done in an independent variable pathbuf. I have renamed pathbuf fdpath because fdpath is more suggestive of what kind of path is in the variable. I moved fdpath into struct linux_binprm because it is tightly tied to the other variables in struct linux_binprm, and as such is needed to allow the call alloc_binprm to move. Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lkml.kernel.org/r/87k0z66x8f.fsf@x220.int.ebiederm.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> |
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| .. | ||
| acpi | ||
| asm-generic | ||
| clocksource | ||
| crypto | ||
| drm | ||
| dt-bindings | ||
| keys | ||
| kunit | ||
| kvm | ||
| linux | ||
| math-emu | ||
| media | ||
| misc | ||
| net | ||
| pcmcia | ||
| ras | ||
| rdma | ||
| scsi | ||
| soc | ||
| sound | ||
| target | ||
| trace | ||
| uapi | ||
| vdso | ||
| video | ||
| xen | ||