From: Eric Paris Subject: [PATCH] filesystems: use has_capability_noaudit interface for reserved blocks checks Date: Tue, 11 Nov 2008 14:12:49 -0500 Message-ID: <1226430769.3353.5.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: sct@redhat.com, akpm@linux-foundation.org, adilger@sun.com, tytso@mit.edu, linux-ext4@vger.kernel.org, dedekind@infradead.org, ext-adrian.hunter@nokia.com, linux-mtd@lists.infradead.org, dushistov@mail.ru, jmorris@namei.org To: linux-kernel@vger.kernel.org Return-path: Received: from mx2.redhat.com ([66.187.237.31]:41519 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751297AbYKKTNu (ORCPT ); Tue, 11 Nov 2008 14:13:50 -0500 Sender: linux-ext4-owner@vger.kernel.org List-ID: 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 --- 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 +#include #include /* @@ -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) {