tar/SOURCES/tar-1.28-sparse-inf-loops.patch

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2019-08-01 16:38:51 +00:00
From b451bfd224da44e93cf842f23455d755e48421dd Mon Sep 17 00:00:00 2001
From: Pavel Raiskup <praiskup@redhat.com>
Date: Mon, 28 Jul 2014 08:17:55 +0200
Subject: [PATCH 8/9] Fix for infinite loops during sparse file handling
Upstream bugreport (still downstream):
http://www.mail-archive.com/bug-tar@gnu.org/msg04432.html
Resolves: #1082608
---
THANKS | 1 +
src/sparse.c | 48 ++++++++++++++++++++++++++++++++----------------
2 files changed, 33 insertions(+), 16 deletions(-)
diff --git a/THANKS b/THANKS
index b4c5427..e74f71c 100644
--- a/THANKS
+++ b/THANKS
@@ -175,6 +175,7 @@ Fabio d'Alessi cars@civ.bio.unipd.it
Frank Heckenbach frank@g-n-u.de
Frank Koenen koenfr@lidp.com
Franz-Werner Gergen gergen@edvulx.mpi-stuttgart.mpg.de
+François Ouellet fouell@gmail.com
François Pinard pinard@iro.umontreal.ca
Fritz Elfert fritz@fsun.triltsch.de
George Chyu gschyu@ccgate.dp.beckman.com
diff --git a/src/sparse.c b/src/sparse.c
index 6a97676..53c1868 100644
--- a/src/sparse.c
+++ b/src/sparse.c
@@ -301,6 +301,7 @@ sparse_dump_region (struct tar_sparse_file *file, size_t i)
{
union block *blk;
off_t bytes_left = file->stat_info->sparse_map[i].numbytes;
+ const char *file_name = file->stat_info->orig_file_name;
if (!lseek_or_error (file, file->stat_info->sparse_map[i].offset))
return false;
@@ -314,13 +315,23 @@ sparse_dump_region (struct tar_sparse_file *file, size_t i)
bytes_read = safe_read (file->fd, blk->buffer, bufsize);
if (bytes_read == SAFE_READ_ERROR)
{
- read_diag_details (file->stat_info->orig_file_name,
+ read_diag_details (file_name,
(file->stat_info->sparse_map[i].offset
+ file->stat_info->sparse_map[i].numbytes
- bytes_left),
bufsize);
return false;
}
+ if (bytes_read == 0)
+ {
+ char buf[UINTMAX_STRSIZE_BOUND];
+ FATAL_ERROR ((0, 0,
+ ngettext ("%s: File shrank by %s byte",
+ "%s: File shrank by %s bytes",
+ bytes_left),
+ quotearg_colon (file_name),
+ offtostr (bytes_left, buf)));
+ }
memset (blk->buffer + bytes_read, 0, BLOCKSIZE - bytes_read);
bytes_left -= bytes_read;
@@ -475,33 +486,37 @@ sparse_skip_file (struct tar_stat_info *st)
static bool
check_sparse_region (struct tar_sparse_file *file, off_t beg, off_t end)
{
- if (!lseek_or_error (file, beg))
+ off_t offset = beg;
+
+ if (!lseek_or_error (file, offset))
return false;
- while (beg < end)
+ while (offset < end)
{
size_t bytes_read;
- size_t rdsize = BLOCKSIZE < end - beg ? BLOCKSIZE : end - beg;
+ size_t rdsize = BLOCKSIZE < end - offset ? BLOCKSIZE : end - offset;
char diff_buffer[BLOCKSIZE];
bytes_read = safe_read (file->fd, diff_buffer, rdsize);
if (bytes_read == SAFE_READ_ERROR)
{
read_diag_details (file->stat_info->orig_file_name,
- beg,
- rdsize);
- return false;
- }
- if (!zero_block_p (diff_buffer, bytes_read))
- {
- char begbuf[INT_BUFSIZE_BOUND (off_t)];
- report_difference (file->stat_info,
- _("File fragment at %s is not a hole"),
- offtostr (beg, begbuf));
+ offset, rdsize);
return false;
}
- beg += bytes_read;
+ if (bytes_read == 0
+ || !zero_block_p (diff_buffer, bytes_read))
+ {
+ char begbuf[INT_BUFSIZE_BOUND (off_t)];
+ const char *msg = bytes_read ? _("File fragment at %s is not a hole")
+ : _("Hole starting at %s is truncated");
+
+ report_difference (file->stat_info, msg, offtostr (beg, begbuf));
+ return false;
+ }
+
+ offset += bytes_read;
}
return true;
}
@@ -542,7 +557,8 @@ check_data_region (struct tar_sparse_file *file, size_t i)
file->dumped_size += bytes_read;
size_left -= bytes_read;
mv_size_left (file->stat_info->archive_file_size - file->dumped_size);
- if (memcmp (blk->buffer, diff_buffer, rdsize))
+ if (bytes_read == 0
+ || memcmp (blk->buffer, diff_buffer, bytes_read))
{
report_difference (file->stat_info, _("Contents differ"));
return false;
--
1.9.3