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Commit 51d7b120 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

/proc/iomem: only expose physical resource addresses to privileged users 



In commit c4004b02 ("x86: remove the kernel code/data/bss resources
from /proc/iomem") I was hoping to remove the phyiscal kernel address
data from /proc/iomem entirely, but that had to be reverted because some
system programs actually use it.

This limits all the detailed resource information to properly
credentialed users instead.

Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ab0fa82b

kernel/resource.c

+11 −2
Original line number Diff line number Diff line
@@ -105,16 +105,25 @@ static int r_show(struct seq_file *m, void *v) 
{

	struct resource *root = m->private;

	struct resource *r = v, *p;

	unsigned long long start, end;

	int width = root->end < 0x10000 ? 4 : 8;

	int depth;



	for (depth = 0, p = r; depth < MAX_IORES_LEVEL; depth++, p = p->parent)

		if (p->parent == root)

			break;



	if (file_ns_capable(m->file, &init_user_ns, CAP_SYS_ADMIN)) {

		start = r->start;

		end = r->end;

	} else {

		start = end = 0;

	}



	seq_printf(m, "%*s%0*llx-%0*llx : %s\n",

			depth * 2, "",

			width, (unsigned long long) r->start,

			width, (unsigned long long) r->end,

			width, start,

			width, end,

			r->name ? r->name : "<BAD>");

	return 0;

}