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[ARM] 3108/2: old ABI compat: statfs64 and fstatfs64

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Patch from Nicolas Pitre

struct statfs64 has extra padding with EABI growing its size from 84 to
88. This struct is now __attribute__((packed,aligned(4))) with a small
assembly wrapper to force the sz argument to 84 if it is 88 to avoid
copying the extra padding over user space memory unexpecting it.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Nicolas Pitre 2006-01-14 16:35:03 +00:00 committed by Russell King
parent 704bdda038
commit 713c481519
3 changed files with 49 additions and 3 deletions
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4
arch/arm/kernel/calls.S
View File

@ -280,8 +280,8 @@ __syscall_start:
.long sys_clock_gettime
.long sys_clock_getres
/* 265 */ .long sys_clock_nanosleep
.long sys_statfs64
.long sys_fstatfs64
.long sys_statfs64_wrapper
.long sys_fstatfs64_wrapper
.long sys_tgkill
.long sys_utimes
/* 270 */ .long sys_arm_fadvise64_64

10
arch/arm/kernel/entry-common.S
View File

@ -262,6 +262,16 @@ sys_sigaltstack_wrapper:
ldr r2, [sp, #S_OFF + S_SP]
b do_sigaltstack
sys_statfs64_wrapper:
teq r1, #88
moveq r1, #84
b sys_statfs64
sys_fstatfs64_wrapper:
teq r1, #88
moveq r1, #84
b sys_fstatfs64
/*
* Note: off_4k (r5) is always units of 4K. If we can't do the requested
* offset, we return EINVAL.

38
include/asm-arm/statfs.h
View File

@ -1,6 +1,42 @@
#ifndef _ASMARM_STATFS_H
#define _ASMARM_STATFS_H
#include <asm-generic/statfs.h>
#ifndef __KERNEL_STRICT_NAMES
# include <linux/types.h>
typedef __kernel_fsid_t fsid_t;
#endif
struct statfs {
__u32 f_type;
__u32 f_bsize;
__u32 f_blocks;
__u32 f_bfree;
__u32 f_bavail;
__u32 f_files;
__u32 f_ffree;
__kernel_fsid_t f_fsid;
__u32 f_namelen;
__u32 f_frsize;
__u32 f_spare[5];
};
/*
* With EABI there is 4 bytes of padding added to this structure.
* Let's pack it so the padding goes away to simplify dual ABI support.
* Note that user space does NOT have to pack this structure.
*/
struct statfs64 {
__u32 f_type;
__u32 f_bsize;
__u64 f_blocks;
__u64 f_bfree;
__u64 f_bavail;
__u64 f_files;
__u64 f_ffree;
__kernel_fsid_t f_fsid;
__u32 f_namelen;
__u32 f_frsize;
__u32 f_spare[5];
} __attribute__ ((packed,aligned(4)));
#endif