diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 48e1a141a44e37db2364e2d3b56423f2a6f18600..a2d9ec6764abd1413f81e70b5bd929a16c0fc23b 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1179,9 +1179,18 @@ out: return ret; } +static int pagemap_open(struct inode *inode, struct file *file) +{ + /* do not disclose physical addresses: attack vector */ + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + return 0; +} + const struct file_operations proc_pagemap_operations = { .llseek = mem_lseek, /* borrow this */ .read = pagemap_read, + .open = pagemap_open, }; #endif /* CONFIG_PROC_PAGE_MONITOR */