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From 531eb00aaa03f448cdb3f0c647db7f8d4544c50a Mon Sep 17 00:00:00 2001
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From: "Brian C. Lane" <bcl@redhat.com>
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Date: Mon, 23 Jul 2018 14:34:30 -0700
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Subject: [PATCH 84/88] Fix the length of several strncpy calls
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These need to be 1 less than the allocated size of the buffer, strncpy
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will fill shorter strings with zeros, but there needs to be room for at
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least one 0x00 at the end if the string is the same length as the buffer
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and has no terminating 0x00.
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Related: rhbz#1602652
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---
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libparted/arch/linux.c | 12 ++++++++----
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libparted/labels/mac.c | 9 ++++++---
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2 files changed, 14 insertions(+), 7 deletions(-)
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diff --git a/libparted/arch/linux.c b/libparted/arch/linux.c
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index 1c26b8c..dd4820d 100644
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--- a/libparted/arch/linux.c
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+++ b/libparted/arch/linux.c
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@@ -2571,9 +2571,12 @@ _blkpg_add_partition (PedDisk* disk, const PedPartition *part)
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linux_part.length = part->geom.length * disk->dev->sector_size;
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}
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linux_part.pno = part->num;
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- strncpy (linux_part.devname, dev_name, BLKPG_DEVNAMELTH);
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- if (vol_name)
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- strncpy (linux_part.volname, vol_name, BLKPG_VOLNAMELTH);
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+ strncpy (linux_part.devname, dev_name, BLKPG_DEVNAMELTH-1);
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+ linux_part.devname[BLKPG_DEVNAMELTH-1] = '\0';
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+ if (vol_name) {
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+ strncpy (linux_part.volname, vol_name, BLKPG_VOLNAMELTH-1);
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+ linux_part.volname[BLKPG_VOLNAMELTH-1] = '\0';
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+ }
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free (dev_name);
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@@ -2629,7 +2632,8 @@ static int _blkpg_resize_partition (PedDisk* disk, const PedPartition *part)
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else
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linux_part.length = part->geom.length * disk->dev->sector_size;
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linux_part.pno = part->num;
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- strncpy (linux_part.devname, dev_name, BLKPG_DEVNAMELTH);
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+ strncpy (linux_part.devname, dev_name, BLKPG_DEVNAMELTH-1);
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+ linux_part.devname[BLKPG_DEVNAMELTH-1] = '\0';
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free (dev_name);
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diff --git a/libparted/labels/mac.c b/libparted/labels/mac.c
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index fa4e43f..4942c82 100644
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--- a/libparted/labels/mac.c
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+++ b/libparted/labels/mac.c
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@@ -930,8 +930,10 @@ _generate_raw_part (PedDisk* disk, PedPartition* part,
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= PED_CPU_TO_BE32 (mac_disk_data->last_part_entry_num);
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part_map_entry->start_block = PED_CPU_TO_BE32 (part->geom.start);
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part_map_entry->block_count = PED_CPU_TO_BE32 (part->geom.length);
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- strncpy (part_map_entry->name, mac_part_data->volume_name, 32);
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- strncpy (part_map_entry->type, mac_part_data->system_name, 32);
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+ strncpy (part_map_entry->name, mac_part_data->volume_name, 31);
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+ part_map_entry->name[31] = '\0';
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+ strncpy (part_map_entry->type, mac_part_data->system_name, 31);
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+ part_map_entry->type[31] = '\0';
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if (mac_part_data->is_driver) {
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if (mac_part_data->has_driver)
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@@ -954,7 +956,8 @@ _generate_raw_part (PedDisk* disk, PedPartition* part,
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part_map_entry->boot_cksum =
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PED_CPU_TO_BE32 (mac_part_data->boot_checksum);
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- strncpy (part_map_entry->processor, mac_part_data->processor_name, 16);
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+ strncpy (part_map_entry->processor, mac_part_data->processor_name, 15);
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+ part_map_entry->processor[15] = '\0';
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if (!_pad_raw_part (disk, part->num, part_map))
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goto error;
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--
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2.17.1
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