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Revert "pstore: Honor dmesg_restrict sysctl on dmesg dumps"

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PD#SWPL-7092

This reverts commit 68c4a4f8ab, with
various conflict clean-ups.

With the default root directory mode set to 0750 now, the capability
check was redundant.

Change-Id: If978c34cef8345b0ba67a038eed7d54d4f1423d6
Suggested-by: Nick Kralevich <nnk@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook
2017-08-10 13:36:35 -07:00
committed by Luke Go
parent 67deaf62c8
commit c4aa33507d
3 changed files with 1 additions and 33 deletions
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22
fs/pstore/inode.c
View File

@@ -36,7 +36,6 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/syslog.h>
#include <linux/amlogic/debug_ftrace_ramoops.h>
#include "internal.h"
@@ -125,18 +124,6 @@ static const struct seq_operations pstore_ftrace_seq_ops = {
.show = pstore_ftrace_seq_show,
};
static int pstore_check_syslog_permissions(struct pstore_private *ps)
{
switch (ps->type) {
case PSTORE_TYPE_DMESG:
case PSTORE_TYPE_CONSOLE:
return check_syslog_permissions(SYSLOG_ACTION_READ_ALL,
SYSLOG_FROM_READER);
default:
return 0;
}
}
static ssize_t pstore_file_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
@@ -155,10 +142,6 @@ static int pstore_file_open(struct inode *inode, struct file *file)
int err;
const struct seq_operations *sops = NULL;
err = pstore_check_syslog_permissions(ps);
if (err)
return err;
if (ps->type == PSTORE_TYPE_FTRACE)
sops = &pstore_ftrace_seq_ops;
@@ -195,11 +178,6 @@ static const struct file_operations pstore_file_operations = {
static int pstore_unlink(struct inode *dir, struct dentry *dentry)
{
struct pstore_private *p = d_inode(dentry)->i_private;
int err;
err = pstore_check_syslog_permissions(p);
if (err)
return err;
if (p->psi->erase)
p->psi->erase(p->type, p->id, p->count,

9
include/linux/syslog.h
View File

@@ -49,13 +49,4 @@
int do_syslog(int type, char __user *buf, int count, int source);
#ifdef CONFIG_PRINTK
int check_syslog_permissions(int type, int source);
#else
static inline int check_syslog_permissions(int type, int source)
{
return 0;
}
#endif
#endif /* _LINUX_SYSLOG_H */

3
kernel/printk/printk.c
View File

@@ -615,7 +615,7 @@ static int syslog_action_restricted(int type)
type != SYSLOG_ACTION_SIZE_BUFFER;
}
int check_syslog_permissions(int type, int source)
static int check_syslog_permissions(int type, int source)
{
/*
* If this is from /proc/kmsg and we've already opened it, then we've
@@ -643,7 +643,6 @@ int check_syslog_permissions(int type, int source)
ok:
return security_syslog(type);
}
EXPORT_SYMBOL_GPL(check_syslog_permissions);
static void append_char(char **pp, char *e, char c)
{