Messages in this thread | | | Date | Fri, 26 Oct 2007 14:24:44 +0100 (BST) | From | Hugh Dickins <> | Subject | Re: [PATCH] [RFC] brk randomization: compute RLIMIT_DATA properly (was Re: x86: randomize brk() and RLIMIT_DATA) |
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On Fri, 26 Oct 2007, Jan Engelhardt wrote: > On Oct 26 2007 13:30, Hugh Dickins wrote: > >> @@ -251,7 +251,8 @@ asmlinkage unsigned long sys_brk(unsigned long brk) > >> * not page aligned -Ram Gupta > >> */ > >> rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur; > >> - if (rlim < RLIM_INFINITY && brk - mm->start_data > rlim) > >> + if (rlim < RLIM_INFINITY && (brk - mm->start_brk) + > >> + (mm->end_data - mm->start_data) > rlim) > >> goto out; > >> > >> newbrk = PAGE_ALIGN(brk); > > Parentheses around (brk - mm->start_brk) + (mm->end_data - mm->start_data) > not strictly necessary.
Yes, but don't you find they make it easier to understand the expression?
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