/proc/iomem: only expose physical resource addresses to privileged users
In commit c4004b02f8
("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>
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ab0fa82b2d
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1 changed files with 11 additions and 2 deletions
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@ -105,16 +105,25 @@ static int r_show(struct seq_file *m, void *v)
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{
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struct resource *root = m->private;
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struct resource *r = v, *p;
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unsigned long long start, end;
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int width = root->end < 0x10000 ? 4 : 8;
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int depth;
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for (depth = 0, p = r; depth < MAX_IORES_LEVEL; depth++, p = p->parent)
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if (p->parent == root)
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break;
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if (file_ns_capable(m->file, &init_user_ns, CAP_SYS_ADMIN)) {
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start = r->start;
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end = r->end;
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} else {
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start = end = 0;
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}
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seq_printf(m, "%*s%0*llx-%0*llx : %s\n",
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depth * 2, "",
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width, (unsigned long long) r->start,
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width, (unsigned long long) r->end,
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width, start,
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width, end,
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r->name ? r->name : "<BAD>");
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return 0;
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}
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