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authorNick Piggin <npiggin@kernel.dk>2011-01-07 09:49:58 +0300
committerNick Piggin <npiggin@kernel.dk>2011-01-07 09:50:29 +0300
commitb74c79e99389cd79b31fcc08f82c24e492e63c7e (patch)
tree763c6b412517306670bc625e90035f2d16bb739f /fs/proc
parent34286d6662308d82aed891852d04c7c3a2649b16 (diff)
downloadlinux-b74c79e99389cd79b31fcc08f82c24e492e63c7e.tar.xz
fs: provide rcu-walk aware permission i_ops
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/base.c6
-rw-r--r--fs/proc/proc_sysctl.c5
2 files changed, 8 insertions, 3 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index dc5b2fcadc3b..b953d41d9abf 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2114,11 +2114,13 @@ static const struct file_operations proc_fd_operations = {
* /proc/pid/fd needs a special permission handler so that a process can still
* access /proc/self/fd after it has executed a setuid().
*/
-static int proc_fd_permission(struct inode *inode, int mask)
+static int proc_fd_permission(struct inode *inode, int mask, unsigned int flags)
{
int rv;
- rv = generic_permission(inode, mask, NULL);
+ if (flags & IPERM_FLAG_RCU)
+ return -ECHILD;
+ rv = generic_permission(inode, mask, flags, NULL);
if (rv == 0)
return 0;
if (task_pid(current) == proc_pid(inode))
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index c9097f43b425..09a1f92a34ef 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -295,7 +295,7 @@ out:
return ret;
}
-static int proc_sys_permission(struct inode *inode, int mask)
+static int proc_sys_permission(struct inode *inode, int mask,unsigned int flags)
{
/*
* sysctl entries that are not writeable,
@@ -305,6 +305,9 @@ static int proc_sys_permission(struct inode *inode, int mask)
struct ctl_table *table;
int error;
+ if (flags & IPERM_FLAG_RCU)
+ return -ECHILD;
+
/* Executable files are not allowed under /proc/sys/ */
if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))
return -EACCES;