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Date: Mon, 09 Dec 2019 08:51:34 -0000
From: "tip-bot2 for Kees Cook" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Zhang Xiaoxu <zhangxiaoxu5@...wei.com>,
Kees Cook <keescook@...omium.org>,
Borislav Petkov <bp@...e.de>,
James Morris <jamorris@...ux.microsoft.com>,
"H. Peter Anvin" <hpa@...or.com>,
Colin Ian King <colin.king@...onical.com>,
Ingo Molnar <mingo@...hat.com>,
linux-security-module@...r.kernel.org,
Matthew Garrett <mjg59@...gle.com>,
Thomas Gleixner <tglx@...utronix.de>,
Tyler Hicks <tyhicks@...onical.com>, "x86-ml" <x86@...nel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/mtrr] x86/mtrr: Require CAP_SYS_ADMIN for all access
The following commit has been merged into the x86/mtrr branch of tip:
Commit-ID: 4fc265a9c9b258ddd7eafbd0dbfca66687c3d8aa
Gitweb: https://git.kernel.org/tip/4fc265a9c9b258ddd7eafbd0dbfca66687c3d8aa
Author: Kees Cook <keescook@...omium.org>
AuthorDate: Mon, 18 Nov 2019 13:09:21 -08:00
Committer: Borislav Petkov <bp@...e.de>
CommitterDate: Mon, 09 Dec 2019 09:24:24 +01:00
x86/mtrr: Require CAP_SYS_ADMIN for all access
Zhang Xiaoxu noted that physical address locations for MTRR were visible
to non-root users, which could be considered an information leak.
In discussing[1] the options for solving this, it sounded like just
moving the capable check into open() was the first step.
If this breaks userspace, then we will have a test case for the more
conservative approaches discussed in the thread. In summary:
- MTRR should check capabilities at open time (or retain the
checks on the opener's permissions for later checks).
- changing the DAC permissions might break something that expects to
open mtrr when not uid 0.
- if we leave the DAC permissions alone and just move the capable check
to the opener, we should get the desired protection. (i.e. check
against CAP_SYS_ADMIN not just the wider uid 0.)
- if that still breaks things, as in userspace expects to be able to
read other parts of the file as non-uid-0 and non-CAP_SYS_ADMIN, then
we need to censor the contents using the opener's permissions. For
example, as done in other /proc cases, like commit
51d7b120418e ("/proc/iomem: only expose physical resource addresses to privileged users").
[1] https://lore.kernel.org/lkml/201911110934.AC5BA313@keescook/
Reported-by: Zhang Xiaoxu <zhangxiaoxu5@...wei.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Borislav Petkov <bp@...e.de>
Acked-by: James Morris <jamorris@...ux.microsoft.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Colin Ian King <colin.king@...onical.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: linux-security-module@...r.kernel.org
Cc: Matthew Garrett <mjg59@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tyler Hicks <tyhicks@...onical.com>
Cc: x86-ml <x86@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: https://lkml.kernel.org/r/201911181308.63F06502A1@keescook
---
arch/x86/kernel/cpu/mtrr/if.c | 21 ++-------------------
1 file changed, 2 insertions(+), 19 deletions(-)
diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
index 268d318..da532f6 100644
--- a/arch/x86/kernel/cpu/mtrr/if.c
+++ b/arch/x86/kernel/cpu/mtrr/if.c
@@ -101,9 +101,6 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
int length;
size_t linelen;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
memset(line, 0, LINE_SIZE);
len = min_t(size_t, len, LINE_SIZE - 1);
@@ -226,8 +223,6 @@ mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
#ifdef CONFIG_COMPAT
case MTRRIOC32_ADD_ENTRY:
#endif
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
err =
mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
file, 0);
@@ -236,24 +231,18 @@ mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
#ifdef CONFIG_COMPAT
case MTRRIOC32_SET_ENTRY:
#endif
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
err = mtrr_add(sentry.base, sentry.size, sentry.type, false);
break;
case MTRRIOC_DEL_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_DEL_ENTRY:
#endif
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
err = mtrr_file_del(sentry.base, sentry.size, file, 0);
break;
case MTRRIOC_KILL_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_KILL_ENTRY:
#endif
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
err = mtrr_del(-1, sentry.base, sentry.size);
break;
case MTRRIOC_GET_ENTRY:
@@ -279,8 +268,6 @@ mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
#ifdef CONFIG_COMPAT
case MTRRIOC32_ADD_PAGE_ENTRY:
#endif
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
err =
mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
file, 1);
@@ -289,8 +276,6 @@ mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
#ifdef CONFIG_COMPAT
case MTRRIOC32_SET_PAGE_ENTRY:
#endif
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
err =
mtrr_add_page(sentry.base, sentry.size, sentry.type, false);
break;
@@ -298,16 +283,12 @@ mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
#ifdef CONFIG_COMPAT
case MTRRIOC32_DEL_PAGE_ENTRY:
#endif
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
err = mtrr_file_del(sentry.base, sentry.size, file, 1);
break;
case MTRRIOC_KILL_PAGE_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_KILL_PAGE_ENTRY:
#endif
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
err = mtrr_del_page(-1, sentry.base, sentry.size);
break;
case MTRRIOC_GET_PAGE_ENTRY:
@@ -410,6 +391,8 @@ static int mtrr_open(struct inode *inode, struct file *file)
return -EIO;
if (!mtrr_if->get)
return -ENXIO;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
return single_open(file, mtrr_seq_show, NULL);
}
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