mirror of
https://github.com/torvalds/linux.git
synced 2024-11-26 06:02:05 +00:00
brk: make sys_brk() honor COMPAT_BRK when computing lower bound
Fix a regression introduced by
commit 4cc6028d40
Author: Jiri Kosina <jkosina@suse.cz>
Date: Wed Feb 6 22:39:44 2008 +0100
brk: check the lower bound properly
The check in sys_brk() on minimum value the brk might have must take
CONFIG_COMPAT_BRK setting into account. When this option is turned on
(i.e. we support ancient legacy binaries, e.g. libc5-linked stuff), the
lower bound on brk value is mm->end_code, otherwise the brk start is
allowed to be arbitrarily shifted.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
33dda515a1
commit
a5b4592cf7
@ -245,10 +245,16 @@ asmlinkage unsigned long sys_brk(unsigned long brk)
|
||||
unsigned long rlim, retval;
|
||||
unsigned long newbrk, oldbrk;
|
||||
struct mm_struct *mm = current->mm;
|
||||
unsigned long min_brk;
|
||||
|
||||
down_write(&mm->mmap_sem);
|
||||
|
||||
if (brk < mm->start_brk)
|
||||
#ifdef CONFIG_COMPAT_BRK
|
||||
min_brk = mm->end_code;
|
||||
#else
|
||||
min_brk = mm->start_brk;
|
||||
#endif
|
||||
if (brk < min_brk)
|
||||
goto out;
|
||||
|
||||
/*
|
||||
|
Loading…
Reference in New Issue
Block a user