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Clement Calmels 1804dc6e14 /proc/self/maps doesn't display the real file offset 
This addresses

	http://bugzilla.kernel.org/show_bug.cgi?id=11318

In function show_map (file: fs/proc/task_mmu.c), if vma->vm_pgoff > 2^20
than (vma->vm_pgoff << PAGE_SIZE) is greater than 2^32 (with PAGE_SIZE
equal to 4096 (i.e.  2^12).  The next seq_printf use an unsigned long for
the conversion of (vma->vm_pgoff << PAGE_SIZE), as a result the offset
value displayed in /proc/self/maps is truncated if the page offset is
greater than 2^20.

A test that shows this issue:

#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

#define PAGE_SIZE (getpagesize())

#if __i386__
#   define U64_STR "%llx"
#elif __x86_64
#   define U64_STR "%lx"
#else
#   error "Architecture Unsupported"
#endif

int main(int argc, char *argv[])
{
	int fd;
	char *addr;
	off64_t offset = 0x10000000;
	char *filename = "/dev/zero";

	fd = open(filename, O_RDONLY);
	if (fd < 0) {
		perror("open");
		return 1;
	}

	offset *= 0x10;
	printf("offset = " U64_STR "\n", offset);

	addr = (char*)mmap64(NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, fd,
			     offset);
	if ((void*)addr == MAP_FAILED) {
		perror("mmap64");
		return 1;
	}

	{
		FILE *fmaps;
		char *line = NULL;
		size_t len = 0;
		ssize_t read;
		size_t filename_len = strlen(filename);

		fmaps = fopen("/proc/self/maps", "r");
		if (!fmaps) {
			perror("fopen");
			return 1;
		}
		while ((read = getline(&line, &len, fmaps)) != -1) {
			if ((read > filename_len + 1)
			    && (strncmp(&line[read - filename_len - 1], filename, filename_len) == 0))
				printf("%s", line);
		}

		if (line)
			free(line);

		fclose(fmaps);
	}

	close(fd);
	return 0;
}

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Clement Calmels <cboulte@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-08-20 15:40:30 -07:00
..
9p
9p: fix O_APPEND in legacy mode
2008-07-03 09:59:03 -05:00
adfs
SL*B: drop kmem cache argument from constructor
2008-07-26 12:00:07 -07:00
affs
[PATCH] f_count may wrap around
2008-07-26 20:53:40 -04:00
afs
mm: rename page trylock
2008-08-04 21:31:34 -07:00
autofs
…
autofs4
autofs4: remove unused ioctls
2008-07-24 10:47:33 -07:00
befs
SL*B: drop kmem cache argument from constructor
2008-07-26 12:00:07 -07:00
bfs
SL*B: drop kmem cache argument from constructor
2008-07-26 12:00:07 -07:00
cifs
[CIFS] mount of IPC$ breaks with iget patch
2008-08-14 03:55:14 +00:00
coda
[PATCH] sanitize __user_walk_fd() et.al.
2008-07-26 20:53:34 -04:00
configfs
[PATCH] configfs: Pin configfs subsystems separately from new config_items.
2008-07-31 16:21:13 -07:00
cramfs
fs: Remove unnecessary inclusions of asm/semaphore.h
2008-04-18 22:16:44 -04:00
debugfs
debugfs: Implement debugfs_remove_recursive()
2008-07-21 21:54:59 -07:00
devpts
[PATCH] devpts: switch to IDA
2008-08-01 11:25:29 -04:00
dlm
dlm: rename structs
2008-08-13 12:47:36 -05:00
ecryptfs
eCryptfs: use page_alloc not kmalloc to get a page of memory
2008-07-28 16:30:21 -07:00
efs
SL*B: drop kmem cache argument from constructor
2008-07-26 12:00:07 -07:00
exportfs
fs: replace remaining __FUNCTION__ occurrences
2008-04-30 08:29:54 -07:00
ext2
vfs: pagecache usage optimization for pagesize!=blocksize
2008-07-28 16:30:21 -07:00
ext3
[PATCH] fix races and leaks in vfs_quota_on() users
2008-08-01 11:25:25 -04:00
ext4
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2008-08-03 10:50:44 -07:00
fat
vfat: fix 'sync' mount deadlock due to BKL->lock_super conversion
2008-08-20 08:31:19 -07:00
freevxfs
fs/freevxfs/: proper externs
2008-04-29 08:06:00 -07:00
fuse
[PATCH] fix MAY_CHDIR/MAY_ACCESS/LOOKUP_ACCESS mess
2008-07-26 20:53:21 -04:00
gfs2
[PATCH] don't pass nameidata to gfs2_lookupi()
2008-07-26 20:53:36 -04:00
hfs
[PATCH] f_count may wrap around
2008-07-26 20:53:40 -04:00
hfsplus
[PATCH] f_count may wrap around
2008-07-26 20:53:40 -04:00
hostfs
[PATCH] sanitize ->permission() prototype
2008-07-26 20:53:14 -04:00
hpfs
[patch 05/14] hpfs: dont call permission()
2008-07-26 20:53:13 -04:00
hppfs
[patch] hppfs: remove hppfs_permission
2008-07-26 20:53:07 -04:00
hugetlbfs
SL*B: drop kmem cache argument from constructor
2008-07-26 12:00:07 -07:00
isofs
SL*B: drop kmem cache argument from constructor
2008-07-26 12:00:07 -07:00
jbd
Merge branch 'core/locking' into core/urgent
2008-08-12 00:11:49 +02:00
jbd2
Merge branch 'core/locking' into core/urgent
2008-08-12 00:11:49 +02:00
jffs2
[JFFS2] Fix allocation of summary buffer
2008-08-01 10:07:51 +01:00
jfs
[PATCH] sanitize ->permission() prototype
2008-07-26 20:53:14 -04:00
lockd
Merge branch 'for-2.6.27' of git://linux-nfs.org/~bfields/linux
2008-08-12 16:39:22 -07:00
minix
SL*B: drop kmem cache argument from constructor
2008-07-26 12:00:07 -07:00
msdos
fatfs: add UTC timestamp option
2008-07-25 10:53:34 -07:00
ncpfs
[PATCH] don't pass nameidata to __ncp_lookup_validate()
2008-07-26 20:53:37 -04:00
nfs
Revert "UFS: add const to parser token table"
2008-08-04 16:50:38 -07:00
nfs_common
…
nfsd
Merge branch 'for-2.6.27' of git://linux-nfs.org/~bfields/linux
2008-08-12 16:39:22 -07:00
nls
…
ntfs
fs: rename buffer trylock
2008-08-04 21:56:09 -07:00
ocfs2
[PATCH] ocfs2: Release mutex in error handling code
2008-07-31 16:21:14 -07:00
omfs
omfs: fix oops when file metadata is corrupted
2008-08-15 08:35:44 -07:00
openpromfs
SL*B: drop kmem cache argument from constructor
2008-07-26 12:00:07 -07:00
partitions
fs/partitions/efi: convert to pr_debug
2008-07-25 10:53:44 -07:00
proc
/proc/self/maps doesn't display the real file offset
2008-08-20 15:40:30 -07:00
qnx4
SL*B: drop kmem cache argument from constructor
2008-07-26 12:00:07 -07:00
ramfs
ramfs: enable splice write
2008-07-04 09:52:14 +02:00
reiserfs
reiserfs: removed duplicated #include
2008-08-12 16:07:30 -07:00
romfs
romfs_readpage: don't report errors for pages beyond i_size
2008-07-30 14:30:34 -07:00
smbfs
[PATCH] sanitize ->permission() prototype
2008-07-26 20:53:14 -04:00
sysfs
Use WARN() in fs/sysfs
2008-07-26 12:00:07 -07:00
sysv
SL*B: drop kmem cache argument from constructor
2008-07-26 12:00:07 -07:00
ubifs
UBIFS: xattr bugfixes
2008-08-14 12:46:20 +03:00
udf
SL*B: drop kmem cache argument from constructor
2008-07-26 12:00:07 -07:00
ufs
Revert "UFS: add const to parser token table"
2008-08-04 16:50:38 -07:00
vfat
fatfs: add UTC timestamp option
2008-07-25 10:53:34 -07:00
xfs
CRED: Introduce credential access wrappers
2008-08-14 09:35:23 +10:00
aio.c
[PATCH] f_count may wrap around
2008-07-26 20:53:40 -04:00
anon_inodes.c
flag parameters: NONBLOCK in anon_inode_getfd
2008-07-24 10:47:28 -07:00
attr.c
[patch 4/4] vfs: immutable inode checking cleanup
2008-07-26 20:53:28 -04:00
bad_inode.c
[PATCH] sanitize ->permission() prototype
2008-07-26 20:53:14 -04:00
binfmt_aout.c
tracehook: exec
2008-07-26 12:00:08 -07:00
binfmt_elf_fdpic.c
binfmt_elf_fdpic: Magical stack pointer index, for NEW_AUX_ENT compat.
2008-07-28 18:10:28 +09:00
binfmt_elf.c
tracehook: exec
2008-07-26 12:00:08 -07:00
binfmt_em86.c
binfmt_misc.c: avoid potential kernel stack overflow
2008-04-29 08:06:04 -07:00
binfmt_flat.c
binfmt_flat: Stub in a FLAT_PLAT_INIT().
2008-08-11 20:17:55 +09:00
binfmt_misc.c
binfmt_misc: use simple_read_from_buffer()
2008-07-24 10:47:27 -07:00
binfmt_script.c
binfmt_misc.c: avoid potential kernel stack overflow
2008-04-29 08:06:04 -07:00
binfmt_som.c
tracehook: exec
2008-07-26 12:00:08 -07:00
bio-integrity.c
bio-integrity: remove EXPORT_SYMBOL for bio_integrity_init_slab()
2008-07-28 16:30:21 -07:00
bio.c
bio: make use of bvec_nr_vecs
2008-08-06 12:30:04 +02:00
block_dev.c
[PATCH] switch mtd and dm-table to lookup_bdev()
2008-08-01 11:25:31 -04:00
buffer.c
fs: rename buffer trylock
2008-08-04 21:56:09 -07:00
char_dev.c
Remove the lock_kernel() call from chrdev_open()
2008-06-20 14:05:53 -06:00
compat_binfmt_elf.c
…
compat_ioctl.c
remove unused #include <linux/dirent.h>'s
2008-07-25 10:53:34 -07:00
compat.c
[PATCH] sanitize __user_walk_fd() et.al.
2008-07-26 20:53:34 -04:00
dcache.c
dcache: Add case-insensitive support d_ci_add() routine
2008-07-28 16:58:39 +10:00
dcookies.c
d_path: Make d_path() use a struct path
2008-02-14 21:17:09 -08:00
direct-io.c
dio: use get_user_pages_fast
2008-07-26 12:00:06 -07:00
dnotify.c
[PATCH] split linux/file.h
2008-05-01 13:08:16 -04:00
dquot.c
[PATCH] fix races and leaks in vfs_quota_on() users
2008-08-01 11:25:25 -04:00
drop_caches.c
vfs: skip inodes without pages to free in drop_pagecache_sb()
2008-04-29 08:06:05 -07:00
eventfd.c
flag parameters: check magic constants
2008-07-24 10:47:29 -07:00
eventpoll.c
fs/eventpoll.c: fix sys_epoll_create1() comment
2008-08-12 16:07:30 -07:00
exec.c
exec: include pagemap.h again to fix build
2008-07-28 16:30:20 -07:00
fcntl.c
[PATCH] clean dup2() up a bit
2008-08-01 11:25:24 -04:00
fifo.c
[PATCH] reuse xxx_fifo_fops for xxx_pipe_fops
2008-07-26 20:53:06 -04:00
file_table.c
[PATCH] f_count may wrap around
2008-07-26 20:53:40 -04:00
file.c
[PATCH] merge locate_fd() and get_unused_fd()
2008-08-01 11:25:23 -04:00
filesystems.c
…
fs-writeback.c
VFS: export sync_sb_inodes
2008-07-14 19:10:52 +03:00
generic_acl.c
…
inode.c
fs/inode.c: properly init address_space->writeback_index
2008-08-15 08:35:44 -07:00
inotify_user.c
[PATCH] sanitize __user_walk_fd() et.al.
2008-07-26 20:53:34 -04:00
inotify.c
…
internal.h
[PATCH] move a bunch of declarations to fs/internal.h
2008-04-21 23:11:01 -04:00
ioctl.c
make vfs_ioctl() static
2008-04-29 08:06:00 -07:00
ioprio.c
…
Kconfig
omfs: update kbuild to include OMFS
2008-07-26 12:00:05 -07:00
Kconfig.binfmt
sh: Initial ELF FDPIC support.
2008-07-28 18:10:28 +09:00
libfs.c
VFS: increase pseudo-filesystem block size to PAGE_SIZE
2008-07-30 09:41:44 -07:00
locks.c
SL*B: drop kmem cache argument from constructor
2008-07-26 12:00:07 -07:00
Makefile
omfs: update kbuild to include OMFS
2008-07-26 12:00:05 -07:00
mbcache.c
vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs
2008-04-15 19:35:41 -07:00
mpage.c
vfs: add hooks for ext4's delayed allocation support
2008-07-11 19:27:31 -04:00
namei.c
[patch 3/4] vfs: remove unused nameidata argument of may_create()
2008-08-01 11:25:30 -04:00
namespace.c
[PATCH] pass struct path * to do_add_mount()
2008-08-01 11:25:32 -04:00
nfsctl.c
Introduce path_put()
2008-02-14 21:13:33 -08:00
no-block.c
…
open.c
[PATCH] merge locate_fd() and get_unused_fd()
2008-08-01 11:25:23 -04:00
pipe.c
[PATCH] reuse xxx_fifo_fops for xxx_pipe_fops
2008-07-26 20:53:06 -04:00
pnode.c
[patch 7/7] vfs: mountinfo: show dominating group id
2008-04-23 00:05:09 -04:00
pnode.h
[patch 7/7] vfs: mountinfo: show dominating group id
2008-04-23 00:05:09 -04:00
posix_acl.c
…
quota_v1.c
quota: move function-macros from quota.h to quotaops.h
2008-07-25 10:53:35 -07:00
quota_v2.c
quota: move function-macros from quota.h to quotaops.h
2008-07-25 10:53:35 -07:00
quota.c
quota: cleanup loop in sync_dquots()
2008-07-25 10:53:35 -07:00
read_write.c
Remove BKL from remote_llseek v2
2008-07-02 15:06:27 -06:00
read_write.h
…
readdir.c
…
select.c
Fix performance regression on lmbench select benchmark
2008-06-22 12:23:15 -07:00
seq_file.c
seq_file: add seq_cpumask(), seq_nodemask()
2008-08-12 16:07:30 -07:00
signalfd.c
flag parameters: check magic constants
2008-07-24 10:47:29 -07:00
splice.c
mm: rename page trylock
2008-08-04 21:31:34 -07:00
stack.c
…
stat.c
[PATCH] sanitize __user_walk_fd() et.al.
2008-07-26 20:53:34 -04:00
super.c
fix soft lock up at NFS mount via per-SB LRU-list of unused dentries
2008-07-24 10:47:15 -07:00
sync.c
SYNC_FILE_RANGE_WRITE may and will block. Document that.
2008-07-24 10:47:17 -07:00
timerfd.c
flag parameters: check magic constants
2008-07-24 10:47:29 -07:00
utimes.c
[PATCH] sanitize __user_walk_fd() et.al.
2008-07-26 20:53:34 -04:00
xattr_acl.c
…
xattr.c
[PATCH] sanitize __user_walk_fd() et.al.
2008-07-26 20:53:34 -04:00