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The LITMUS^RT kernel.

Bjoern Brandenburg

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path: root/drivers/acpi/acpica/dsopcode.c

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author	Len Brown <len.brown@intel.com>	2009-07-30 16:00:53 -0400
committer	Len Brown <len.brown@intel.com>	2009-08-02 11:26:43 -0400
commit	d0006f3281c920fbfead0f5035c62ec8053f980a (patch)
tree	6e014777b6fc1ee9a026216767c265d27e85d141 /drivers/acpi/acpica/dsopcode.c
parent	ed680c4ad478d0fee9740f7d029087f181346564 (diff)

ACPI: root-only read protection on /sys/firmware/acpi/tables/*

they were world readable. Signed-off-by: Len Brown <len.brown@intel.com>

Diffstat (limited to 'drivers/acpi/acpica/dsopcode.c')

0 files changed, 0 insertions, 0 deletions

page *pg; void *p; u64 pa; if (pos < 0) return -EINVAL; if (pos >= node->len) return 0; if (count > node->len - pos) count = node->len - pos; pa = node->paddr + sizeof(struct setup_data) + pos; pg = pfn_to_page((pa + count - 1) >> PAGE_SHIFT); if (PageHighMem(pg)) { p = ioremap_cache(pa, count); if (!p) return -ENXIO; } else p = __va(pa); remain = copy_to_user(user_buf, p, count); if (PageHighMem(pg)) iounmap(p); if (remain) return -EFAULT; *ppos = pos + count; return count; } static int setup_data_open(struct inode *inode, struct file *file) { file->private_data = inode->i_private; return 0; } static const struct file_operations fops_setup_data = { .read = setup_data_read, .open = setup_data_open, }; static int __init create_setup_data_node(struct dentry *parent, int no, struct setup_data_node *node) { struct dentry *d, *type, *data; char buf[16]; sprintf(buf, "%d", no); d = debugfs_create_dir(buf, parent); if (!d) return -ENOMEM; type = debugfs_create_x32("type", S_IRUGO, d, &node->type); if (!type) goto err_dir; data = debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data); if (!data) goto err_type; return 0; err_type: debugfs_remove(type); err_dir: debugfs_remove(d); return -ENOMEM; } static int __init create_setup_data_nodes(struct dentry *parent) { struct setup_data_node *node; struct setup_data *data; int error = -ENOMEM; struct dentry *d; struct page *pg; u64 pa_data; int no = 0; d = debugfs_create_dir("setup_data", parent); if (!d) return -ENOMEM; pa_data = boot_params.hdr.setup_data; while (pa_data) { node = kmalloc(sizeof(*node), GFP_KERNEL); if (!node) goto err_dir; pg = pfn_to_page((pa_data+sizeof(*data)-1) >> PAGE_SHIFT); if (PageHighMem(pg)) { data = ioremap_cache(pa_data, sizeof(*data)); if (!data) { kfree(node); error = -ENXIO; goto err_dir; } } else data = __va(pa_data); node->paddr = pa_data; node->type = data->type; node->len = data->len; error = create_setup_data_node(d, no, node); pa_data = data->next; if (PageHighMem(pg)) iounmap(data); if (error) goto err_dir; no++; } return 0; err_dir: debugfs_remove(d); return error; } static struct debugfs_blob_wrapper boot_params_blob = { .data = &boot_params, .size = sizeof(boot_params), }; static int __init boot_params_kdebugfs_init(void) { struct dentry *dbp, *version, *data; int error = -ENOMEM; dbp = debugfs_create_dir("boot_params", NULL); if (!dbp) return -ENOMEM; version = debugfs_create_x16("version", S_IRUGO, dbp, &boot_params.hdr.version); if (!version) goto err_dir; data = debugfs_create_blob("data", S_IRUGO, dbp, &boot_params_blob); if (!data) goto err_version; error = create_setup_data_nodes(dbp); if (error) goto err_data; return 0; err_data: debugfs_remove(data); err_version: debugfs_remove(version); err_dir: debugfs_remove(dbp); return error; } #endif /* CONFIG_DEBUG_BOOT_PARAMS */ static int __init arch_kdebugfs_init(void) { int error = 0; arch_debugfs_dir = debugfs_create_dir("x86", NULL); if (!arch_debugfs_dir) return -ENOMEM; #ifdef CONFIG_DEBUG_BOOT_PARAMS error = boot_params_kdebugfs_init(); #endif return error; } arch_initcall(arch_kdebugfs_init);


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