Re: Linux kernel uselib() privilege elevation, corrected

[Jason Carr <jason () flacid org>]

Henrik Persson wrote:

> Christian wrote:
>
> > Karol Wiesek schrieb:
> >  > [appelast@nesquik appelast]$ ./ex -l ./lib
> >
> > > > [+] SLAB cleanup
> > > >    child 1 VMAs 65527
> >
> > [...]
> >
> > strange, it does not even compile here:
> >
> > evil@prinz:~/dev/$ gcc -O2 -fomit-frame-pointer elflbl.c -o elflbl
> > elflbl_v108.c: In function `scan_mm_start':
> > elflbl_v108.c:425: error: storage size of `l' isn't known
> > elflbl_v108.c:425: error: storage size of `l' isn't known
> > elflbl_v108.c: In function `check_vma_flags':
> > elflbl_v108.c:545: warning: deprecated use of label at end of compound
> > statement
>
>
> In linux 2.6 the modify_ldt_ldt_s structure is renamed to user_desc. 
> Change that on row 425 and it will compile.
Weird... I tried that and I get this:

jason@overdose [~/vuln] (104) % gcc -O2 -fomit-frame-pointer elflbl.c -o 
elflbl
elflbl.c:89: error: variable-size type declared outside of any function
elflbl.c: In function `make_lib':
elflbl.c:664: error: storage size of 'eh' isn't known
elflbl.c:665: error: storage size of 'eph' isn't known
elflbl.c:666: error: storage size of 'tmpbuf' isn't constant
elflbl.c:680: error: invalid application of `sizeof' to incomplete type 
`elf_phdr'
elflbl.c:666: error: size of variable 'tmpbuf' is too large

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