The patch titled
brk: make sys_brk() honor COMPAT_BRK when computing lower bound
has been removed from the -mm tree. Its filename was
brk-check-lower-bound-properly.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: brk: make sys_brk() honor COMPAT_BRK when computing lower bound
From: Jiri Kosina <jkosina@xxxxxxx>
Fix a regression introduced by
commit 4cc6028d4040f95cdb590a87db478b42b8be0508
Author: Jiri Kosina <jkosina@xxxxxxx>
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@xxxxxxx>
Tested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff -puN mm/mmap.c~brk-check-lower-bound-properly mm/mmap.c
--- a/mm/mmap.c~brk-check-lower-bound-properly
+++ a/mm/mmap.c
@@ -245,10 +245,16 @@ asmlinkage unsigned long sys_brk(unsigne
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;
/*
_
Patches currently in -mm which might be from jkosina@xxxxxxx are
origin.patch
linux-next.patch
elantech-touchpad-driver.patch
input-touchscreen-driver-add-support-ad7877-touchscreen-driver.patch
ds1302-push-down-the-bkl-into-the-driver-ioctl-code.patch
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