linux-kernel - [PATCH 1/9] pstore/zone: cap the maximum device size

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Message-Id: <20201016132047.3068029-2-hch@lst.de>
Date:   Fri, 16 Oct 2020 15:20:39 +0200
From:   Christoph Hellwig <hch@....de>
To:     Kees Cook <keescook@...omium.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        WeiXiong Liao <liaoweixiong@...winnertech.com>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/9] pstore/zone: cap the maximum device size

Introduce an abritrary 128MiB cap to avoid malloc failures when using
a larger block device.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/pstore/zone.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/pstore/zone.c b/fs/pstore/zone.c
index 3ce89216670c9b..5266ccbec007f3 100644
--- a/fs/pstore/zone.c
+++ b/fs/pstore/zone.c
@@ -1299,6 +1299,10 @@ int register_pstore_zone(struct pstore_zone_info *info)
 		pr_warn("total_size must be >= 4096\n");
 		return -EINVAL;
 	}
+	if (info->total_size > SZ_128M) {
+		pr_warn("capping size to 128MiB\n");
+		info->total_size = SZ_128M;
+	}
 
 	if (!info->kmsg_size && !info->pmsg_size && !info->console_size &&
 	    !info->ftrace_size) {
-- 
2.28.0