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[PATCH] x86_64: TASK_SIZE fixes for compatibility mode processes

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Appended patch will setup compatibility mode TASK_SIZE properly.  This will
fix atleast three known bugs that can be encountered while running
compatibility mode apps.

a) A malicious 32bit app can have an elf section at 0xffffe000.  During
   exec of this app, we will have a memory leak as insert_vm_struct() is
   not checking for return value in syscall32_setup_pages() and thus not
   freeing the vma allocated for the vsyscall page.  And instead of exec
   failing (as it has addresses > TASK_SIZE), we were allowing it to
   succeed previously.

b) With a 32bit app, hugetlb_get_unmapped_area/arch_get_unmapped_area
   may return addresses beyond 32bits, ultimately causing corruption
   because of wrap-around and resulting in SEGFAULT, instead of returning
   ENOMEM.

c) 32bit app doing this below mmap will now fail.

  mmap((void *)(0xFFFFE000UL), 0x10000UL, PROT_READ|PROT_WRITE,
	MAP_FIXED|MAP_PRIVATE|MAP_ANON, 0, 0);

Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Suresh Siddha
2005-06-21 17:14:32 -07:00
committed by Linus Torvalds
parent 589777eab7
commit 84929801e1
7 changed files with 25 additions and 30 deletions
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include/asm-x86_64/a.out.h
+1 -1
View File
@@ -21,7 +21,7 @@ struct exec
#ifdef __KERNEL__
#include <linux/thread_info.h>
#define STACK_TOP (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE)
#define STACK_TOP TASK_SIZE
#endif
#endif /* __A_OUT_GNU_H__ */
include/asm-x86_64/processor.h
+6 -5
View File
@@ -160,16 +160,17 @@ static inline void clear_in_cr4 (unsigned long mask)
/*
* User space process size. 47bits minus one guard page.
*/
#define TASK_SIZE (0x800000000000UL - 4096)
#define TASK_SIZE64 (0x800000000000UL - 4096)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? 0xc0000000 : 0xFFFFe000)
#define TASK_UNMAPPED_32 PAGE_ALIGN(IA32_PAGE_OFFSET/3)
#define TASK_UNMAPPED_64 PAGE_ALIGN(TASK_SIZE/3)
#define TASK_UNMAPPED_BASE \
(test_thread_flag(TIF_IA32) ? TASK_UNMAPPED_32 : TASK_UNMAPPED_64)
#define TASK_SIZE (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE64)
#define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)
#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE/3)
/*
* Size of io_bitmap.