Messages in this thread Patch in this message | | | Date | Tue, 2 Oct 2007 09:39:43 +0200 | From | Jens Axboe <> | Subject | [PATCH] Fix blktrace setup 32-bit ioctl on 64-bit kernels |
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Hi,
The layout of struct blk_user_trace_setup is a bit unfortunate, it gets padded differently on 32-bit and 64-bit archs. So right now it's not possible to trace 64-bit kernels with a 32-bit app. This patch fixes that up by adding a compat ioctl handler for BLKTRACESETUP.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c index 5a5b711..b18b9cc 100644 --- a/fs/compat_ioctl.c +++ b/fs/compat_ioctl.c @@ -2052,6 +2052,51 @@ static int raw_ioctl(unsigned fd, unsigned cmd, unsigned long arg) } return ret; } + +struct blk_user_trace_setup32 { + char name[32]; + u16 act_mask; + u16 pad; + u32 buf_size; + u32 buf_nr; + u64 start_lba; + u64 end_lba; + u32 pid; +} __attribute__((packed)); + +#define BLKTRACESETUP32 _IOWR(0x12,115,struct blk_user_trace_setup32) + +static int blktrace32_setup(int fd, unsigned cmd, unsigned long arg) +{ + struct blk_user_trace_setup __user *buts = compat_alloc_user_space(sizeof(*buts)); + struct blk_user_trace_setup32 __user *buts32 = compat_ptr(arg); + int err; + + if (copy_in_user(&buts->name, &buts32->name, BDEVNAME_SIZE) || + get_user(buts->act_mask, &buts32->act_mask) || + get_user(buts->buf_size, &buts32->buf_size) || + get_user(buts->buf_nr, &buts32->buf_nr) || + get_user(buts->start_lba, &buts32->start_lba) || + get_user(buts->end_lba, &buts32->end_lba) || + get_user(buts->pid, &buts32->pid)) + return -EFAULT; + + err = sys_ioctl(fd, BLKTRACESETUP, (unsigned long) buts); + if (err) + return err; + + if (copy_to_user(&buts32->name, &buts->name, BDEVNAME_SIZE) || + put_user(buts32->act_mask, &buts->act_mask) || + put_user(buts32->buf_size, &buts->buf_size) || + put_user(buts32->buf_nr, &buts->buf_nr) || + put_user(buts32->start_lba, &buts->start_lba) || + put_user(buts32->end_lba, &buts->end_lba) || + put_user(buts32->pid, &buts->pid)) + return -EFAULT; + + return err; +} + #endif /* CONFIG_BLOCK */ struct serial_struct32 { @@ -2555,7 +2600,7 @@ COMPATIBLE_IOCTL(BLKSECTSET) COMPATIBLE_IOCTL(BLKSSZGET) COMPATIBLE_IOCTL(BLKTRACESTART) COMPATIBLE_IOCTL(BLKTRACESTOP) -COMPATIBLE_IOCTL(BLKTRACESETUP) +HANDLE_IOCTL(BLKTRACESETUP32, blktrace32_setup) COMPATIBLE_IOCTL(BLKTRACETEARDOWN) ULONG_IOCTL(BLKRASET) ULONG_IOCTL(BLKFRASET) -- Jens Axboe
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