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Date:	Tue, 11 Nov 2008 14:12:49 -0500
From:	Eric Paris <eparis@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	sct@...hat.com, akpm@...ux-foundation.org, adilger@....com,
	tytso@....edu, linux-ext4@...r.kernel.org, dedekind@...radead.org,
	ext-adrian.hunter@...ia.com, linux-mtd@...ts.infradead.org,
	dushistov@...l.ru, jmorris@...ei.org
Subject: [PATCH] filesystems: use has_capability_noaudit interface for
 reserved blocks checks

ext[2,3,4], ufs, and ubifs all check for  CAP_SYS_RESOURCE to determine
if they should allow reserved blocks to be used.  A process not having
this capability is not failing some security decision and should not be
audited.  Thus move to using has_capability_noaudit.

Signed-off-by: Eric Paris <eparis@...hat.com>
---

I would like to push this patch through the security tree (since that's
the only place the new cap_noaudit interface exists), but I'd like to
get an ACK from each subsystem maintainer.

 fs/ext2/balloc.c     |    2 +-
 fs/ext3/balloc.c     |    2 +-
 fs/ext4/balloc.c     |    2 +-
 fs/ubifs/budget.c    |    3 ++-
 fs/ufs/balloc.c      |    2 +-
 security/commoncap.c |    1 +
 security/security.c  |    1 +
 7 files changed, 8 insertions(+), 5 deletions(-)


diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index 6dac7ba..e06d96d 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -1192,7 +1192,7 @@ static int ext2_has_free_blocks(struct ext2_sb_info *sbi)
 
 	free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
 	root_blocks = le32_to_cpu(sbi->s_es->s_r_blocks_count);
-	if (free_blocks < root_blocks + 1 && !capable(CAP_SYS_RESOURCE) &&
+	if (free_blocks < root_blocks + 1 && !has_capability_noaudit(current, CAP_SYS_RESOURCE) &&
 		sbi->s_resuid != current->fsuid &&
 		(sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) {
 		return 0;
diff --git a/fs/ext3/balloc.c b/fs/ext3/balloc.c
index f5b57a2..f224ee4 100644
--- a/fs/ext3/balloc.c
+++ b/fs/ext3/balloc.c
@@ -1421,7 +1421,7 @@ static int ext3_has_free_blocks(struct ext3_sb_info *sbi)
 
 	free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
 	root_blocks = le32_to_cpu(sbi->s_es->s_r_blocks_count);
-	if (free_blocks < root_blocks + 1 && !capable(CAP_SYS_RESOURCE) &&
+	if (free_blocks < root_blocks + 1 && !has_capability_noaudit(current, CAP_SYS_RESOURCE) &&
 		sbi->s_resuid != current->fsuid &&
 		(sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) {
 		return 0;
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index d2003cd..a7c7c52 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -626,7 +626,7 @@ int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
 	/* Hm, nope.  Are (enough) root reserved blocks available? */
 	if (sbi->s_resuid == current->fsuid ||
 	    ((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) ||
-	    capable(CAP_SYS_RESOURCE)) {
+	    has_capability_noaudit(current, CAP_SYS_RESOURCE)) {
 		if (free_blocks >= (nblocks + dirty_blocks))
 			return 1;
 	}
diff --git a/fs/ubifs/budget.c b/fs/ubifs/budget.c
index 1a4973e..d17b8b4 100644
--- a/fs/ubifs/budget.c
+++ b/fs/ubifs/budget.c
@@ -32,6 +32,7 @@
 
 #include "ubifs.h"
 #include <linux/writeback.h>
+#include <linux/capability.h>
 #include <asm/div64.h>
 
 /*
@@ -363,7 +364,7 @@ long long ubifs_calc_available(const struct ubifs_info *c, int min_idx_lebs)
  */
 static int can_use_rp(struct ubifs_info *c)
 {
-	if (current->fsuid == c->rp_uid || capable(CAP_SYS_RESOURCE) ||
+	if (current->fsuid == c->rp_uid || has_capability_noaudit(current, CAP_SYS_RESOURCE) ||
 	    (c->rp_gid != 0 && in_group_p(c->rp_gid)))
 		return 1;
 	return 0;
diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c
index 0d9ada1..ad4398b 100644
--- a/fs/ufs/balloc.c
+++ b/fs/ufs/balloc.c
@@ -411,7 +411,7 @@ u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment,
 	/*
 	 * There is not enough space for user on the device
 	 */
-	if (!capable(CAP_SYS_RESOURCE) && ufs_freespace(uspi, UFS_MINFREE) <= 0) {
+	if (!has_capability_noaudit(current, CAP_SYS_RESOURCE) && ufs_freespace(uspi, UFS_MINFREE) <= 0) {
 		unlock_super (sb);
 		UFSD("EXIT (FAILED)\n");
 		return 0;
diff --git a/security/commoncap.c b/security/commoncap.c
index 73999f6..5401e77 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -55,6 +55,7 @@ int cap_capable(struct task_struct *tsk, int cap, int audit)
 		return 0;
 	return -EPERM;
 }
+EXPORT_SYMBOL(cap_capable);
 
 int cap_settime(struct timespec *ts, struct timezone *tz)
 {
diff --git a/security/security.c b/security/security.c
index 346f21e..d061eb1 100644
--- a/security/security.c
+++ b/security/security.c
@@ -170,6 +170,7 @@ int security_capable_noaudit(struct task_struct *tsk, int cap)
 {
 	return security_ops->capable(tsk, cap, SECURITY_CAP_NOAUDIT);
 }
+EXPORT_SYMBOL(security_capable_noaudit);
 
 int security_acct(struct file *file)
 {


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