The patch titled
diskquota: 32bit quota tools on 64bit architectures
has been added to the -mm tree. Its filename is
diskquota-32bit-quota-tools-on-64bit-architectures.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: diskquota: 32bit quota tools on 64bit architectures
From: Vasily Tarasov <vtaras@xxxxxxxxxx>
OpenVZ Linux kernel team has discovered the problem with 32bit quota tools
working on 64bit architectures. In 2.6.10 kernel sys32_quotactl() function
was replaced by sys_quotactl() with the comment "sys_quotactl seems to be
32/64bit clean, enable it for 32bit" However this isn't right. Look at
if_dqblk structure:
struct if_dqblk {
__u64 dqb_bhardlimit;
__u64 dqb_bsoftlimit;
__u64 dqb_curspace;
__u64 dqb_ihardlimit;
__u64 dqb_isoftlimit;
__u64 dqb_curinodes;
__u64 dqb_btime;
__u64 dqb_itime;
__u32 dqb_valid;
};
For 32 bit quota tools sizeof(if_dqblk) == 0x44.
But for 64 bit kernel its size is 0x48, 'cause of alignment!
Thus we got a problem. Attached patch reintroduce sys32_quotactl() function,
that handles this and related situations.
Signed-off-by: Vasily Tarasov <vtaras@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>
Cc: Jan Kara <jack@xxxxxx>
Cc: <linux-arch@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/ia64/ia32/ia32_entry.S | 2
arch/x86_64/ia32/ia32entry.S | 2
fs/quota.c | 118 +++++++++++++++++++++++++++++++++
3 files changed, 120 insertions(+), 2 deletions(-)
diff -puN arch/ia64/ia32/ia32_entry.S~diskquota-32bit-quota-tools-on-64bit-architectures arch/ia64/ia32/ia32_entry.S
--- a/arch/ia64/ia32/ia32_entry.S~diskquota-32bit-quota-tools-on-64bit-architectures
+++ a/arch/ia64/ia32/ia32_entry.S
@@ -304,7 +304,7 @@ ia32_syscall_table:
data8 sys_ni_syscall /* init_module */
data8 sys_ni_syscall /* delete_module */
data8 sys_ni_syscall /* get_kernel_syms */ /* 130 */
- data8 sys_quotactl
+ data8 sys32_quotactl
data8 sys_getpgid
data8 sys_fchdir
data8 sys_ni_syscall /* sys_bdflush */
diff -puN arch/x86_64/ia32/ia32entry.S~diskquota-32bit-quota-tools-on-64bit-architectures arch/x86_64/ia32/ia32entry.S
--- a/arch/x86_64/ia32/ia32entry.S~diskquota-32bit-quota-tools-on-64bit-architectures
+++ a/arch/x86_64/ia32/ia32entry.S
@@ -526,7 +526,7 @@ ia32_sys_call_table:
.quad sys_init_module
.quad sys_delete_module
.quad quiet_ni_syscall /* 130 get_kernel_syms */
- .quad sys_quotactl
+ .quad sys32_quotactl
.quad sys_getpgid
.quad sys_fchdir
.quad quiet_ni_syscall /* bdflush */
diff -puN fs/quota.c~diskquota-32bit-quota-tools-on-64bit-architectures fs/quota.c
--- a/fs/quota.c~diskquota-32bit-quota-tools-on-64bit-architectures
+++ a/fs/quota.c
@@ -10,12 +10,14 @@
#include <linux/slab.h>
#include <asm/current.h>
#include <asm/uaccess.h>
+#include <asm/compat.h>
#include <linux/kernel.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/buffer_head.h>
#include <linux/capability.h>
#include <linux/quotaops.h>
+#include <linux/types.h>
/* Check validity of generic quotactl commands */
static int generic_quotactl_valid(struct super_block *sb, int type, int cmd, qid_t id)
@@ -384,3 +386,119 @@ asmlinkage long sys_quotactl(unsigned in
return ret;
}
+
+#if defined(CONFIG_X86_64) || defined(CONFIG_IA64)
+/*
+ * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64)
+ * and is necessary due to alignment problems.
+ */
+struct compat_if_dqblk {
+ compat_u64 dqb_bhardlimit;
+ compat_u64 dqb_bsoftlimit;
+ compat_u64 dqb_curspace;
+ compat_u64 dqb_ihardlimit;
+ compat_u64 dqb_isoftlimit;
+ compat_u64 dqb_curinodes;
+ compat_u64 dqb_btime;
+ compat_u64 dqb_itime;
+ compat_uint_t dqb_valid;
+};
+
+/* XFS structures */
+struct compat_fs_qfilestat {
+ compat_u64 dqb_bhardlimit;
+ compat_u64 qfs_nblks;
+ compat_uint_t qfs_nextents;
+};
+
+struct compat_fs_quota_stat {
+ __s8 qs_version;
+ __u16 qs_flags;
+ __s8 qs_pad;
+ struct compat_fs_qfilestat qs_uquota;
+ struct compat_fs_qfilestat qs_gquota;
+ compat_uint_t qs_incoredqs;
+ compat_int_t qs_btimelimit;
+ compat_int_t qs_itimelimit;
+ compat_int_t qs_rtbtimelimit;
+ __u16 qs_bwarnlimit;
+ __u16 qs_iwarnlimit;
+};
+
+asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
+ qid_t id, void __user *addr)
+{
+ unsigned int cmds;
+ struct if_dqblk __user *dqblk;
+ struct compat_if_dqblk __user *compat_dqblk;
+ struct fs_quota_stat __user *fsqstat;
+ struct compat_fs_quota_stat __user *compat_fsqstat;
+ compat_uint_t data;
+ u16 xdata;
+ long ret;
+
+ cmds = cmd >> SUBCMDSHIFT;
+
+ switch (cmds) {
+ case Q_GETQUOTA:
+ dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
+ compat_dqblk = addr;
+ ret = sys_quotactl(cmd, special, id, dqblk);
+ if (ret)
+ break;
+ if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) ||
+ get_user(data, &dqblk->dqb_valid) ||
+ put_user(data, &compat_dqblk->dqb_valid))
+ ret = -EFAULT;
+ break;
+ case Q_SETQUOTA:
+ dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
+ compat_dqblk = addr;
+ ret = -EFAULT;
+ if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) ||
+ get_user(data, &compat_dqblk->dqb_valid) ||
+ put_user(data, &dqblk->dqb_valid))
+ break;
+ ret = sys_quotactl(cmd, special, id, dqblk);
+ break;
+ case Q_XGETQSTAT:
+ fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat));
+ compat_fsqstat = addr;
+ ret = sys_quotactl(cmd, special, id, fsqstat);
+ if (ret)
+ break;
+ ret = -EFAULT;
+ /* Copying qs_version, qs_flags, qs_pad */
+ if (copy_in_user(compat_fsqstat, fsqstat,
+ offsetof(struct compat_fs_quota_stat, qs_uquota)))
+ break;
+ /* Copying qs_uquota */
+ if (copy_in_user(&compat_fsqstat->qs_uquota,
+ &fsqstat->qs_uquota,
+ sizeof(compat_fsqstat->qs_uquota)) ||
+ get_user(data, &fsqstat->qs_uquota.qfs_nextents) ||
+ put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents))
+ break;
+ /* Copying qs_gquota */
+ if (copy_in_user(&compat_fsqstat->qs_gquota,
+ &fsqstat->qs_gquota,
+ sizeof(compat_fsqstat->qs_gquota)) ||
+ get_user(data, &fsqstat->qs_gquota.qfs_nextents) ||
+ put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents))
+ break;
+ /* Copying the rest */
+ if (copy_in_user(&compat_fsqstat->qs_incoredqs,
+ &fsqstat->qs_incoredqs,
+ sizeof(struct compat_fs_quota_stat) -
+ offsetof(struct compat_fs_quota_stat, qs_incoredqs)) ||
+ get_user(xdata, &fsqstat->qs_iwarnlimit) ||
+ put_user(xdata, &compat_fsqstat->qs_iwarnlimit))
+ break;
+ ret = 0;
+ break;
+ default:
+ ret = sys_quotactl(cmd, special, id, addr);
+ }
+ return ret;
+}
+#endif
_
Patches currently in -mm which might be from vtaras@xxxxxxxxxx are
introduce-compat_u64-and-compat_s64-types.patch
diskquota-32bit-quota-tools-on-64bit-architectures.patch
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