[lkml]   [2001]   [Oct]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Security question: "Text file busy" overwriting executables but

On Fri, 5 Oct 2001, Horst von Brand wrote:

> Linus Torvalds <> said:
> > On 5 Oct 2001, Eric W. Biederman wrote:
> [...]
> > > Currently checking to see if the file is executable looks good
> > > enough.
> >
> > [ executable by the user in question, not just anybody ]
> >
> > Yes, I suspect it is.
> Who is "user in question"? It is quite legal (if strange) to have a file
> user A can modify, but not execute, while B can execute it.

The "user in question" being the one that actually does the
mmap(MAP_DENYWRITE). If _he_ can execute the file, that would be
reason enough to think that he can deny others from writing to it while he
has it mapped..


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:04    [W:0.088 / U:1.104 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site