Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4cc6028d4040f95cdb590a87db478b42b8be0508
Commit: 4cc6028d4040f95cdb590a87db478b42b8be0508
Parent: 2d684cd6d9cf0c6a0e28978362671b6e2d8fb56c
Author: Jiri Kosina <[EMAIL PROTECTED]>
AuthorDate: Wed Feb 6 22:39:44 2008 +0100
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Feb 6 22:39:44 2008 +0100
brk: check the lower bound properly
There is a check in sys_brk(), that tries to make sure that we do not
underflow the area that is dedicated to brk heap.
The check is however wrong, as it assumes that brk area starts immediately
after the end of the code (+bss), which is wrong for example in
environments with randomized brk start. The proper way is to check whether
the address is not below the start_brk address.
Signed-off-by: Jiri Kosina <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
mm/mmap.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index bb4c963..ad6e4ea 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -245,7 +245,7 @@ asmlinkage unsigned long sys_brk(unsigned long brk)
down_write(&mm->mmap_sem);
- if (brk < mm->end_code)
+ if (brk < mm->start_brk)
goto out;
/*
-
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