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authorDjalal Harouni <tixxdz@opendz.org>2014-04-08 02:38:38 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-08 03:36:05 +0400
commit32ed74a4b968a4faff7aaaff557035ce5d5e70ab (patch)
treec03255e24b352eadc03c568a91ea205aac782879 /fs/proc
parent35a35046e4f9d8849e727b0e0f6edac0ece4ca6e (diff)
downloadlinux-32ed74a4b968a4faff7aaaff557035ce5d5e70ab.tar.xz
procfs: make /proc/*/pagemap 0400
The /proc/*/pagemap contain sensitive information and currently its mode is 0444. Change this to 0400, so the VFS will prevent unprivileged processes from getting file descriptors on arbitrary privileged /proc/*/pagemap files. This reduces the scope of address space leaking and bypasses by protecting already running processes. Signed-off-by: Djalal Harouni <tixxdz@opendz.org> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Andy Lutomirski <luto@amacapital.net> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/base.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index a08c92289357..8da60e768b42 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2617,7 +2617,7 @@ static const struct pid_entry tgid_base_stuff[] = {
#ifdef CONFIG_PROC_PAGE_MONITOR
REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
REG("smaps", S_IRUGO, proc_pid_smaps_operations),
- REG("pagemap", S_IRUGO, proc_pagemap_operations),
+ REG("pagemap", S_IRUSR, proc_pagemap_operations),
#endif
#ifdef CONFIG_SECURITY
DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
@@ -2955,7 +2955,7 @@ static const struct pid_entry tid_base_stuff[] = {
#ifdef CONFIG_PROC_PAGE_MONITOR
REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
REG("smaps", S_IRUGO, proc_tid_smaps_operations),
- REG("pagemap", S_IRUGO, proc_pagemap_operations),
+ REG("pagemap", S_IRUSR, proc_pagemap_operations),
#endif
#ifdef CONFIG_SECURITY
DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),