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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-04-14 12:05:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-04-14 12:56:09 -0700 |
| commit | 51d7b120418e99d6b3bf8df9eb3cc31e8171dee4 (patch) | |
| tree | d8fb1817068df408e6a009df9050159aebdd95c4 | |
| parent | ab0fa82b2df96ddadb327ac39f26b5d80cb3d104 (diff) | |
| download | linux-51d7b120418e99d6b3bf8df9eb3cc31e8171dee4.tar.gz linux-51d7b120418e99d6b3bf8df9eb3cc31e8171dee4.tar.bz2 linux-51d7b120418e99d6b3bf8df9eb3cc31e8171dee4.zip | |
/proc/iomem: only expose physical resource addresses to privileged users
In commit c4004b02f8e5b ("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: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/resource.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/kernel/resource.c b/kernel/resource.c index 2e78ead30934..9b5f04404152 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -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; } |