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Message-Id: <20171021133606.18866-1-nicolas@belouin.fr>
Date: Sat, 21 Oct 2017 15:36:06 +0200
From: Nicolas Belouin <nicolas@...ouin.fr>
To: Alexander Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Cc: Nicolas Belouin <nicolas@...ouin.fr>
Subject: [PATCH] fs: check for CAP_SYS_RESOURCE instead of CAP_SYS_ADMIN
This check is meant to allow a privileged process to go above max_files,
such a check must be done against CAP_SYS_RESOURCE as its role is to
allow resources limits override.
Signed-off-by: Nicolas Belouin <nicolas@...ouin.fr>
---
fs/file_table.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/file_table.c b/fs/file_table.c
index 61517f57f8ef..4bc74fd50838 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -111,7 +111,8 @@ struct file *get_empty_filp(void)
/*
* Privileged users can go above max_files
*/
- if (get_nr_files() >= files_stat.max_files && !capable(CAP_SYS_ADMIN)) {
+ if (get_nr_files() >= files_stat.max_files && !capable(CAP_SYS_ADMIN) &&
+ !capable(CAP_SYS_RESOURCE)) {
/*
* percpu_counters are inaccurate. Do an expensive check before
* we go and fail.
--
2.14.2
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