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Sanitize the type of struct user.u_ar0

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struct user.u_ar0 is defined to contain a pointer offset on all
architectures in which it is defined (all architectures which define an
a.out format except SPARC.) However, it has a pointer type in the headers,
which is pointless -- <asm/user.h> is not exported to userspace, and it
just makes the code messy.

Redefine the field as "unsigned long" (which is the same size as a pointer
on all Linux architectures) and change the setting code to user offsetof()
instead of hand-coded arithmetic.

Cc: Linux Arch Mailing List <[email protected]>
Cc: Bryan Wu <[email protected]>
Cc: Roman Zippel <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Ivan Kokshaysky <[email protected]>
Cc: Russell King <[email protected]>
Cc: Lennert Buytenhek <[email protected]>
Cc: Håvard Skinnemoen <[email protected]>
Cc: Mikael Starvik <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Hirokazu Takata <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Paul Mundt <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
H. Peter Anvin 2008-02-07 00:15:57 -08:00 • committed by Linus Torvalds
commit 6e16d89bcd
18 changed files with 18 additions and 22 deletions
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2
include/asm-x86/user_32.h
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@ -116,7 +116,7 @@ struct user{
esp register. */
long int signal; /* Signal that caused the core dump. */
int reserved; /* No longer used */
struct user_pt_regs * u_ar0; /* Used by gdb to help find the values for */
unsigned long u_ar0; /* Used by gdb to help find the values for */
/* the registers. */
struct user_i387_struct* u_fpstate; /* Math Co-processor pointer. */
unsigned long magic; /* To uniquely identify a core file */

2
include/asm-x86/user_64.h
View file

@ -118,7 +118,7 @@ struct user{
long int signal; /* Signal that caused the core dump. */
int reserved; /* No longer used */
int pad1;
struct user_pt_regs * u_ar0; /* Used by gdb to help find the values for */
unsigned long u_ar0; /* Used by gdb to help find the values for */
/* the registers. */
struct user_i387_struct* u_fpstate; /* Math Co-processor pointer. */
unsigned long magic; /* To uniquely identify a core file */