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author | Al Viro <viro@ZenIV.linux.org.uk> | 2009-08-24 22:42:56 +0000 |
---|---|---|
committer | Arnd Bergmann <arnd@arndb.de> | 2010-10-19 11:29:54 +0200 |
commit | c4a047272566b44b44222369d50a307c708c4f74 (patch) | |
tree | 05f3883b35741afb8afec90c61891f8a1b2c8da9 /fs/compat_ioctl.c | |
parent | 9a181c58617134822ae596339dbea076ef9b5cf7 (diff) | |
download | linux-c4a047272566b44b44222369d50a307c708c4f74.tar.bz2 |
fix rawctl compat ioctls breakage on amd64 and itanic
RAW_SETBIND and RAW_GETBIND 32bit versions are fscked in interesting ways.
1) fs/compat_ioctl.c has COMPATIBLE_IOCTL(RAW_SETBIND) followed by
HANDLE_IOCTL(RAW_SETBIND, raw_ioctl). The latter is ignored.
2) on amd64 (and itanic) the damn thing is broken - we have int + u64 + u64
and layouts on i386 and amd64 are _not_ the same. raw_ioctl() would
work there, but it's never called due to (1). As it is, i386 /sbin/raw
definitely doesn't work on amd64 boxen.
3) switching to raw_ioctl() as is would *not* work on e.g. sparc64 and ppc64,
which would be rather sad, seeing that normal userland there is 32bit.
The thing is, slapping __packed on the struct in question does not DTRT -
it eliminates *all* padding. The real solution is to use compat_u64.
4) of course, all that stuff has no business being outside of raw.c in the
first place - there should be ->compat_ioctl() for /dev/rawctl instead of
messing with compat_ioctl.c.
[akpm@linux-foundation.org: coding-style fixes]
[arnd@arndb.de: port to 2.6.36]
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'fs/compat_ioctl.c')
-rw-r--r-- | fs/compat_ioctl.c | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c index 03e59aa318eb..d0ad09d57789 100644 --- a/fs/compat_ioctl.c +++ b/fs/compat_ioctl.c @@ -599,69 +599,6 @@ static int do_smb_getmountuid(unsigned int fd, unsigned int cmd, #define HIDPGETCONNLIST _IOR('H', 210, int) #define HIDPGETCONNINFO _IOR('H', 211, int) -#ifdef CONFIG_BLOCK -struct raw32_config_request -{ - compat_int_t raw_minor; - __u64 block_major; - __u64 block_minor; -} __attribute__((packed)); - -static int get_raw32_request(struct raw_config_request *req, struct raw32_config_request __user *user_req) -{ - int ret; - - if (!access_ok(VERIFY_READ, user_req, sizeof(struct raw32_config_request))) - return -EFAULT; - - ret = __get_user(req->raw_minor, &user_req->raw_minor); - ret |= __get_user(req->block_major, &user_req->block_major); - ret |= __get_user(req->block_minor, &user_req->block_minor); - - return ret ? -EFAULT : 0; -} - -static int set_raw32_request(struct raw_config_request *req, struct raw32_config_request __user *user_req) -{ - int ret; - - if (!access_ok(VERIFY_WRITE, user_req, sizeof(struct raw32_config_request))) - return -EFAULT; - - ret = __put_user(req->raw_minor, &user_req->raw_minor); - ret |= __put_user(req->block_major, &user_req->block_major); - ret |= __put_user(req->block_minor, &user_req->block_minor); - - return ret ? -EFAULT : 0; -} - -static int raw_ioctl(unsigned fd, unsigned cmd, - struct raw32_config_request __user *user_req) -{ - int ret; - - switch (cmd) { - case RAW_SETBIND: - default: { /* RAW_GETBIND */ - struct raw_config_request req; - mm_segment_t oldfs = get_fs(); - - if ((ret = get_raw32_request(&req, user_req))) - return ret; - - set_fs(KERNEL_DS); - ret = sys_ioctl(fd,cmd,(unsigned long)&req); - set_fs(oldfs); - - if ((!ret) && (cmd == RAW_GETBIND)) { - ret = set_raw32_request(&req, user_req); - } - break; - } - } - return ret; -} -#endif /* CONFIG_BLOCK */ struct serial_struct32 { compat_int_t type; @@ -1262,9 +1199,6 @@ COMPATIBLE_IOCTL(SOUND_MIXER_PRIVATE5) COMPATIBLE_IOCTL(SOUND_MIXER_GETLEVELS) COMPATIBLE_IOCTL(SOUND_MIXER_SETLEVELS) COMPATIBLE_IOCTL(OSS_GETVERSION) -/* Raw devices */ -COMPATIBLE_IOCTL(RAW_SETBIND) -COMPATIBLE_IOCTL(RAW_GETBIND) /* SMB ioctls which do not need any translations */ COMPATIBLE_IOCTL(SMB_IOC_NEWCONN) /* Watchdog */ @@ -1523,10 +1457,6 @@ static long do_ioctl_trans(int fd, unsigned int cmd, case MTIOCGET32: case MTIOCPOS32: return mt_ioctl_trans(fd, cmd, argp); - /* Raw devices */ - case RAW_SETBIND: - case RAW_GETBIND: - return raw_ioctl(fd, cmd, argp); #endif /* One SMB ioctl needs translations. */ #define SMB_IOC_GETMOUNTUID_32 _IOR('u', 1, compat_uid_t) |