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Re: [PATCH] FAT/exFAT: Fix wrong size detection for files > 4GB

From: Vladimir 'phcoder' Serbinenko
Subject: Re: [PATCH] FAT/exFAT: Fix wrong size detection for files > 4GB
Date: Wed, 24 Aug 2016 16:08:20 +0000

This makes it unsigned from signed. Did you check that no code relies on signedness in fat.c?

Le mer. 24 août 2016 17:53, Carlo Caione <address@hidden> a écrit :
From: Carlo Caione <address@hidden>

For exFAT the file size can be > 4GB. The 'grub_fat_data' is still
marking the 'file_size' as grub_ssize_t that is always 32bit when
compiling for i386-pc also when using exFAT.

This is causing a problem when trying to open in loopback a > 4GB file
from an exFAT partition.

Fix this modifying the size of the 'file_size' according to the
MODE_EXFAT define.

Signed-off-by: Carlo Caione <address@hidden>
 grub-core/fs/fat.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/grub-core/fs/fat.c b/grub-core/fs/fat.c
index 79fe864..d5212c2 100644
--- a/grub-core/fs/fat.c
+++ b/grub-core/fs/fat.c
@@ -183,7 +183,11 @@ struct grub_fat_data
   grub_uint32_t num_clusters;

   grub_uint8_t attr;
-  grub_ssize_t file_size;
+#ifndef MODE_EXFAT
+  grub_uint32_t file_size;
+  grub_uint64_t file_size;
   grub_uint32_t file_cluster;
   grub_uint32_t cur_cluster_num;
   grub_uint32_t cur_cluster;

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