lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1192555093.6118.164.camel@localhost>
Date:	Tue, 16 Oct 2007 10:18:13 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Fengguang Wu <wfg@...l.ustc.edu.cn>
Subject: maps3: introduce task_size_of for all arches (updated v4)

The following replaces the earlier patches sent.  It should address
David Rientjes's comments, and has been compile tested on all the
architectures that it touches, save for parisc.


----

For the /proc/<pid>/pagemap code[1], we need to able to query how
much virtual address space a particular task has.  The trick is
that we do it through /proc and can't use TASK_SIZE since it
references "current" on some arches.  The process opening the
/proc file might be a 32-bit process opening a 64-bit process's
pagemap file.

x86_64 already has a TASK_SIZE_OF() macro:

#define TASK_SIZE_OF(child)     ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)

I'd like to have that for other architectures.  So, add it
for all the architectures that actually use "current" in 
their TASK_SIZE.  For the others, just add a quick #define
in sched.h to use plain old TASK_SIZE.

1. http://www.linuxworld.com/news/2007/042407-kernel.html

- MIPS portion from Ralf Baechle <ralf@...ux-mips.org>

Signed-off-by: Dave Hansen <haveblue@...ibm.com>
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Matt Mackall <mpm@...enic.com>
---

 lxc-dave/include/asm-ia64/processor.h    |    3 ++-
 lxc-dave/include/asm-mips/processor.h    |    4 ++++
 lxc-dave/include/asm-parisc/processor.h  |    3 ++-
 lxc-dave/include/asm-powerpc/processor.h |    3 ++-
 lxc-dave/include/asm-s390/processor.h    |    3 ++-
 lxc-dave/include/linux/sched.h           |    4 ++++
 6 files changed, 16 insertions(+), 4 deletions(-)

diff -puN include/asm-ia64/processor.h~PATCH_2_11_maps3-_introduce_task_size_of_for_all_arches include/asm-ia64/processor.h
--- lxc/include/asm-ia64/processor.h~PATCH_2_11_maps3-_introduce_task_size_of_for_all_arches	2007-10-15 17:29:22.000000000 -0700
+++ lxc-dave/include/asm-ia64/processor.h	2007-10-15 17:29:22.000000000 -0700
@@ -31,7 +31,8 @@
  * each (assuming 8KB page size), for a total of 8TB of user virtual
  * address space.
  */
-#define TASK_SIZE		(current->thread.task_size)
+#define TASK_SIZE_OF(tsk)	((tsk)->thread.task_size)
+#define TASK_SIZE       	TASK_SIZE_OF(current)
 
 /*
  * This decides where the kernel will search for a free chunk of vm
diff -puN include/asm-mips/processor.h~PATCH_2_11_maps3-_introduce_task_size_of_for_all_arches include/asm-mips/processor.h
--- lxc/include/asm-mips/processor.h~PATCH_2_11_maps3-_introduce_task_size_of_for_all_arches	2007-10-15 17:29:22.000000000 -0700
+++ lxc-dave/include/asm-mips/processor.h	2007-10-16 09:26:44.000000000 -0700
@@ -45,6 +45,8 @@ extern unsigned int vced_count, vcei_cou
  * space during mmap's.
  */
 #define TASK_UNMAPPED_BASE	(PAGE_ALIGN(TASK_SIZE / 3))
+#define TASK_SIZE_OF(tsk)						\
+	(test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
 #endif
 
 #ifdef CONFIG_64BIT
@@ -65,6 +67,8 @@ extern unsigned int vced_count, vcei_cou
 #define TASK_UNMAPPED_BASE						\
 	(test_thread_flag(TIF_32BIT_ADDR) ?				\
 		PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
+#define TASK_SIZE_OF(tsk)						\
+	(test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
 #endif
 
 #define NUM_FPU_REGS	32
diff -puN include/asm-parisc/processor.h~PATCH_2_11_maps3-_introduce_task_size_of_for_all_arches include/asm-parisc/processor.h
--- lxc/include/asm-parisc/processor.h~PATCH_2_11_maps3-_introduce_task_size_of_for_all_arches	2007-10-15 17:29:22.000000000 -0700
+++ lxc-dave/include/asm-parisc/processor.h	2007-10-15 17:31:39.000000000 -0700
@@ -32,7 +32,8 @@
 #endif
 #define current_text_addr() ({ void *pc; current_ia(pc); pc; })
 
-#define TASK_SIZE               (current->thread.task_size)
+#define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
+#define TASK_SIZE	        TASK_SIZE_OF(current)
 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
 
 #define DEFAULT_TASK_SIZE32	(0xFFF00000UL)
diff -puN include/asm-powerpc/processor.h~PATCH_2_11_maps3-_introduce_task_size_of_for_all_arches include/asm-powerpc/processor.h
--- lxc/include/asm-powerpc/processor.h~PATCH_2_11_maps3-_introduce_task_size_of_for_all_arches	2007-10-15 17:29:22.000000000 -0700
+++ lxc-dave/include/asm-powerpc/processor.h	2007-10-15 17:32:00.000000000 -0700
@@ -99,8 +99,9 @@ extern struct task_struct *last_task_use
  */
 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
 
-#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
+#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
 		TASK_SIZE_USER32 : TASK_SIZE_USER64)
+#define TASK_SIZE	  TASK_SIZE_OF(current)
 
 /* This decides where the kernel will search for a free chunk of vm
  * space during mmap's.
diff -puN include/asm-s390/processor.h~PATCH_2_11_maps3-_introduce_task_size_of_for_all_arches include/asm-s390/processor.h
--- lxc/include/asm-s390/processor.h~PATCH_2_11_maps3-_introduce_task_size_of_for_all_arches	2007-10-15 17:29:22.000000000 -0700
+++ lxc-dave/include/asm-s390/processor.h	2007-10-15 17:32:31.000000000 -0700
@@ -73,8 +73,9 @@ extern struct task_struct *last_task_use
 
 #else /* __s390x__ */
 
-# define TASK_SIZE		(test_thread_flag(TIF_31BIT) ? \
+# define TASK_SIZE_OF(tsk)	(test_tsk_thread_flag(tsk, TIF_31BIT) ? \
 					(0x80000000UL) : (0x40000000000UL))
+# define TASK_SIZE		TASK_SIZE_OF(current)
 # define TASK_UNMAPPED_BASE	(TASK_SIZE / 2)
 # define DEFAULT_TASK_SIZE	(0x40000000000UL)
 
diff -puN include/linux/sched.h~PATCH_2_11_maps3-_introduce_task_size_of_for_all_arches include/linux/sched.h
--- lxc/include/linux/sched.h~PATCH_2_11_maps3-_introduce_task_size_of_for_all_arches	2007-10-15 17:29:22.000000000 -0700
+++ lxc-dave/include/linux/sched.h	2007-10-15 17:32:42.000000000 -0700
@@ -1953,6 +1953,10 @@ static inline void inc_syscw(struct task
 }
 #endif
 
+#ifndef TASK_SIZE_OF
+#define TASK_SIZE_OF(tsk)	TASK_SIZE
+#endif
+
 #endif /* __KERNEL__ */
 
 #endif
_


-- Dave

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ