License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 15:07:57 +01:00
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2005-04-16 15:20:36 -07:00
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2011-11-16 23:57:37 -05:00
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2005-04-16 15:20:36 -07:00
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2014-07-02 15:22:37 -07:00
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2005-04-16 15:20:36 -07:00
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2012-05-23 18:01:20 -06:00
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2014-07-02 15:22:37 -07:00
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2015-09-09 15:38:33 -07:00
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2015-11-06 16:32:40 -08:00
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2005-04-16 15:20:36 -07:00
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2016-12-24 11:46:01 -08:00
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2005-04-16 15:20:36 -07:00
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2012-03-23 15:02:55 -07:00
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2014-07-02 15:22:37 -07:00
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2017-05-08 15:57:09 -07:00
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2014-07-02 15:22:37 -07:00
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2005-04-16 15:20:36 -07:00
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2008-03-28 00:46:41 -04:00
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2015-06-30 14:57:36 -07:00
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2005-04-16 15:20:36 -07:00
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2006-12-06 20:40:36 -08:00
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2005-04-16 15:20:36 -07:00
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2015-06-30 14:57:33 -07:00
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2005-11-07 17:15:34 -05:00
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2006-03-23 03:00:37 -08:00
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2005-04-16 15:20:36 -07:00
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Make file credentials available to the seqfile interfaces
A lot of seqfile users seem to be using things like %pK that uses the
credentials of the current process, but that is actually completely
wrong for filesystem interfaces.
The unix semantics for permission checking files is to check permissions
at _open_ time, not at read or write time, and that is not just a small
detail: passing off stdin/stdout/stderr to a suid application and making
the actual IO happen in privileged context is a classic exploit
technique.
So if we want to be able to look at permissions at read time, we need to
use the file open credentials, not the current ones. Normal file
accesses can just use "f_cred" (or any of the helper functions that do
that, like file_ns_capable()), but the seqfile interfaces do not have
any such options.
It turns out that seq_file _does_ save away the user_ns information of
the file, though. Since user_ns is just part of the full credential
information, replace that special case with saving off the cred pointer
instead, and suddenly seq_file has all the permission information it
needs.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-14 11:22:00 -07:00
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2005-04-16 15:20:36 -07:00
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2009-02-18 14:48:16 -08:00
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2005-04-16 15:20:36 -07:00
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2009-02-04 15:12:25 -08:00
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2014-07-02 15:22:37 -07:00
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2009-02-04 15:12:25 -08:00
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2014-09-29 16:08:21 -07:00
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2009-02-04 15:12:25 -08:00
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2009-02-06 00:30:05 +03:00
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2009-02-04 15:12:25 -08:00
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2014-07-02 15:22:37 -07:00
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2013-11-19 01:20:43 +00:00
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2014-07-02 15:22:37 -07:00
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2009-02-04 15:12:25 -08:00
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2005-04-16 15:20:36 -07:00
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2005-05-01 08:59:26 -07:00
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2005-04-16 15:20:36 -07:00
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2010-09-04 18:52:49 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-23 03:00:37 -08:00
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2009-02-18 14:48:16 -08:00
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seq_file: fix mishandling of consecutive pread() invocations.
The following program illustrates the problem:
char buf[8192];
int fd = open("/proc/self/maps", O_RDONLY);
n = pread(fd, buf, sizeof(buf), 0);
printf("%d\n", n);
/* lseek(fd, 0, SEEK_CUR); */ /* Uncomment to work around */
n = pread(fd, buf, sizeof(buf), 0);
printf("%d\n", n);
The second printf() prints zero, but uncommenting the lseek() corrects its
behaviour.
To fix, make seq_read() mirror seq_lseek() when processing changes in
*ppos. Restore m->version first, then if required traverse and update
read_pos on success.
Addresses https://bugzilla.kernel.org/show_bug.cgi?id=11856
Signed-off-by: Earl Chew <echew@ixiacom.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-21 16:33:43 -07:00
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2016-11-29 15:18:20 +01:00
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2009-02-18 14:48:16 -08:00
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seq_file: fix mishandling of consecutive pread() invocations.
The following program illustrates the problem:
char buf[8192];
int fd = open("/proc/self/maps", O_RDONLY);
n = pread(fd, buf, sizeof(buf), 0);
printf("%d\n", n);
/* lseek(fd, 0, SEEK_CUR); */ /* Uncomment to work around */
n = pread(fd, buf, sizeof(buf), 0);
printf("%d\n", n);
The second printf() prints zero, but uncommenting the lseek() corrects its
behaviour.
To fix, make seq_read() mirror seq_lseek() when processing changes in
*ppos. Restore m->version first, then if required traverse and update
read_pos on success.
Addresses https://bugzilla.kernel.org/show_bug.cgi?id=11856
Signed-off-by: Earl Chew <echew@ixiacom.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-21 16:33:43 -07:00
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2009-02-18 14:48:16 -08:00
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2005-04-16 15:20:36 -07:00
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2014-07-02 15:22:37 -07:00
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2005-04-16 15:20:36 -07:00
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fs/seq_file: fix out-of-bounds read
seq_read() is a nasty piece of work, not to mention buggy.
It has (I think) an old bug which allows unprivileged userspace to read
beyond the end of m->buf.
I was getting these:
BUG: KASAN: slab-out-of-bounds in seq_read+0xcd2/0x1480 at addr ffff880116889880
Read of size 2713 by task trinity-c2/1329
CPU: 2 PID: 1329 Comm: trinity-c2 Not tainted 4.8.0-rc1+ #96
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014
Call Trace:
kasan_object_err+0x1c/0x80
kasan_report_error+0x2cb/0x7e0
kasan_report+0x4e/0x80
check_memory_region+0x13e/0x1a0
kasan_check_read+0x11/0x20
seq_read+0xcd2/0x1480
proc_reg_read+0x10b/0x260
do_loop_readv_writev.part.5+0x140/0x2c0
do_readv_writev+0x589/0x860
vfs_readv+0x7b/0xd0
do_readv+0xd8/0x2c0
SyS_readv+0xb/0x10
do_syscall_64+0x1b3/0x4b0
entry_SYSCALL64_slow_path+0x25/0x25
Object at ffff880116889100, in cache kmalloc-4096 size: 4096
Allocated:
PID = 1329
save_stack_trace+0x26/0x80
save_stack+0x46/0xd0
kasan_kmalloc+0xad/0xe0
__kmalloc+0x1aa/0x4a0
seq_buf_alloc+0x35/0x40
seq_read+0x7d8/0x1480
proc_reg_read+0x10b/0x260
do_loop_readv_writev.part.5+0x140/0x2c0
do_readv_writev+0x589/0x860
vfs_readv+0x7b/0xd0
do_readv+0xd8/0x2c0
SyS_readv+0xb/0x10
do_syscall_64+0x1b3/0x4b0
return_from_SYSCALL_64+0x0/0x6a
Freed:
PID = 0
(stack is not available)
Memory state around the buggy address:
ffff88011688a000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88011688a080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88011688a100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88011688a180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88011688a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Disabling lock debugging due to kernel taint
This seems to be the same thing that Dave Jones was seeing here:
https://lkml.org/lkml/2016/8/12/334
There are multiple issues here:
1) If we enter the function with a non-empty buffer, there is an attempt
to flush it. But it was not clearing m->from after doing so, which
means that if we try to do this flush twice in a row without any call
to traverse() in between, we are going to be reading from the wrong
place -- the splat above, fixed by this patch.
2) If there's a short write to userspace because of page faults, the
buffer may already contain multiple lines (i.e. pos has advanced by
more than 1), but we don't save the progress that was made so the
next call will output what we've already returned previously. Since
that is a much less serious issue (and I have a headache after
staring at seq_read() for the past 8 hours), I'll leave that for now.
Link: http://lkml.kernel.org/r/1471447270-32093-1-git-send-email-vegard.nossum@oracle.com
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Reported-by: Dave Jones <davej@codemonkey.org.uk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-08-25 15:17:11 -07:00
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2005-04-16 15:20:36 -07:00
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fs/seq_file: fix out-of-bounds read
seq_read() is a nasty piece of work, not to mention buggy.
It has (I think) an old bug which allows unprivileged userspace to read
beyond the end of m->buf.
I was getting these:
BUG: KASAN: slab-out-of-bounds in seq_read+0xcd2/0x1480 at addr ffff880116889880
Read of size 2713 by task trinity-c2/1329
CPU: 2 PID: 1329 Comm: trinity-c2 Not tainted 4.8.0-rc1+ #96
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014
Call Trace:
kasan_object_err+0x1c/0x80
kasan_report_error+0x2cb/0x7e0
kasan_report+0x4e/0x80
check_memory_region+0x13e/0x1a0
kasan_check_read+0x11/0x20
seq_read+0xcd2/0x1480
proc_reg_read+0x10b/0x260
do_loop_readv_writev.part.5+0x140/0x2c0
do_readv_writev+0x589/0x860
vfs_readv+0x7b/0xd0
do_readv+0xd8/0x2c0
SyS_readv+0xb/0x10
do_syscall_64+0x1b3/0x4b0
entry_SYSCALL64_slow_path+0x25/0x25
Object at ffff880116889100, in cache kmalloc-4096 size: 4096
Allocated:
PID = 1329
save_stack_trace+0x26/0x80
save_stack+0x46/0xd0
kasan_kmalloc+0xad/0xe0
__kmalloc+0x1aa/0x4a0
seq_buf_alloc+0x35/0x40
seq_read+0x7d8/0x1480
proc_reg_read+0x10b/0x260
do_loop_readv_writev.part.5+0x140/0x2c0
do_readv_writev+0x589/0x860
vfs_readv+0x7b/0xd0
do_readv+0xd8/0x2c0
SyS_readv+0xb/0x10
do_syscall_64+0x1b3/0x4b0
return_from_SYSCALL_64+0x0/0x6a
Freed:
PID = 0
(stack is not available)
Memory state around the buggy address:
ffff88011688a000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88011688a080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88011688a100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88011688a180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88011688a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Disabling lock debugging due to kernel taint
This seems to be the same thing that Dave Jones was seeing here:
https://lkml.org/lkml/2016/8/12/334
There are multiple issues here:
1) If we enter the function with a non-empty buffer, there is an attempt
to flush it. But it was not clearing m->from after doing so, which
means that if we try to do this flush twice in a row without any call
to traverse() in between, we are going to be reading from the wrong
place -- the splat above, fixed by this patch.
2) If there's a short write to userspace because of page faults, the
buffer may already contain multiple lines (i.e. pos has advanced by
more than 1), but we don't save the progress that was made so the
next call will output what we've already returned previously. Since
that is a much less serious issue (and I have a headache after
staring at seq_read() for the past 8 hours), I'll leave that for now.
Link: http://lkml.kernel.org/r/1471447270-32093-1-git-send-email-vegard.nossum@oracle.com
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Reported-by: Dave Jones <davej@codemonkey.org.uk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-08-25 15:17:11 -07:00
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2005-04-16 15:20:36 -07:00
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2008-08-24 07:45:33 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-28 00:46:41 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-28 00:46:41 -04:00
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2008-08-24 07:45:33 -04:00
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2005-04-16 15:20:36 -07:00
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2014-07-02 15:22:37 -07:00
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2013-11-19 01:20:43 +00:00
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2014-07-02 15:22:37 -07:00
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2005-04-16 15:20:36 -07:00
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2008-08-24 07:45:33 -04:00
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2005-04-16 15:20:36 -07:00
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2014-09-29 16:08:21 -07:00
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2005-04-16 15:20:36 -07:00
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2008-03-28 00:46:41 -04:00
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2005-04-16 15:20:36 -07:00
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2009-02-18 14:48:16 -08:00
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2005-04-16 15:20:36 -07:00
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2009-02-18 14:48:16 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-23 03:00:37 -08:00
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2005-04-16 15:20:36 -07:00
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2005-05-01 08:59:26 -07:00
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2013-01-09 17:13:00 -08:00
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2005-04-16 15:20:36 -07:00
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2012-12-17 15:59:39 -08:00
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2005-04-16 15:20:36 -07:00
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2010-09-04 18:52:49 -07:00
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2008-04-22 15:09:22 +02:00
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2005-04-16 15:20:36 -07:00
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2006-03-23 03:00:37 -08:00
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2005-04-16 15:20:36 -07:00
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2012-12-17 15:59:39 -08:00
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2013-02-27 17:03:22 -08:00
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2005-04-16 15:20:36 -07:00
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seq_file: always update file->f_pos in seq_lseek()
This issue was first pointed out by Jiaxing Wang several months ago, but no
further comments:
https://lkml.org/lkml/2013/6/29/41
As we know pread() does not change f_pos, so after pread(), file->f_pos
and m->read_pos become different. And seq_lseek() does not update file->f_pos
if offset equals to m->read_pos, so after pread() and seq_lseek()(lseek to
m->read_pos), then a subsequent read may read from a wrong position, the
following program produces the problem:
char str1[32] = { 0 };
char str2[32] = { 0 };
int poffset = 10;
int count = 20;
/*open any seq file*/
int fd = open("/proc/modules", O_RDONLY);
pread(fd, str1, count, poffset);
printf("pread:%s\n", str1);
/*seek to where m->read_pos is*/
lseek(fd, poffset+count, SEEK_SET);
/*supposed to read from poffset+count, but this read from position 0*/
read(fd, str2, count);
printf("read:%s\n", str2);
out put:
pread:
ck_netbios_ns 12665
read:
nf_conntrack_netbios
/proc/modules:
nf_conntrack_netbios_ns 12665 0 - Live 0xffffffffa038b000
nf_conntrack_broadcast 12589 1 nf_conntrack_netbios_ns, Live 0xffffffffa0386000
So we always update file->f_pos to offset in seq_lseek() to fix this issue.
Signed-off-by: Jiaxing Wang <hello.wjx@gmail.com>
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25 18:15:06 +08:00
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2013-02-27 17:03:22 -08:00
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2005-04-16 15:20:36 -07:00
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2007-07-15 23:40:22 -07:00
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2005-04-16 15:20:36 -07:00
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2013-02-27 16:59:05 -05:00
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2005-04-16 15:20:36 -07:00
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2010-09-04 18:52:49 -07:00
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2014-07-02 15:22:37 -07:00
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2005-04-16 15:20:36 -07:00
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2015-09-11 13:07:48 -07:00
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2005-04-16 15:20:36 -07:00
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2015-09-11 13:07:48 -07:00
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2005-04-16 15:20:36 -07:00
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2015-11-06 16:32:40 -08:00
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2005-04-16 15:20:36 -07:00
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2015-11-06 16:32:40 -08:00
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2005-04-16 15:20:36 -07:00
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2015-09-11 13:07:48 -07:00
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2005-04-16 15:20:36 -07:00
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2015-09-11 13:07:48 -07:00
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2005-04-16 15:20:36 -07:00
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2012-03-23 15:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2012-06-11 13:16:35 +01:00
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2015-09-11 13:07:48 -07:00
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2012-06-11 13:16:35 +01:00
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2015-09-11 13:07:48 -07:00
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2012-06-11 13:16:35 +01:00
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2005-04-16 15:20:36 -07:00
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2008-11-22 13:28:48 +02:00
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2008-11-23 23:24:53 +02:00
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2008-11-22 13:28:48 +02:00
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2011-12-08 20:18:57 -05:00
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2008-03-27 13:06:20 +01:00
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2008-11-28 18:03:22 +01:00
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2008-03-27 13:06:20 +01:00
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2008-12-01 14:35:00 -08:00
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2008-03-27 13:06:20 +01:00
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2011-12-08 20:18:57 -05:00
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2005-04-16 15:20:36 -07:00
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2009-09-21 14:48:36 +02:00
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2005-04-16 15:20:36 -07:00
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2009-09-21 14:48:36 +02:00
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2005-04-16 15:20:36 -07:00
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2009-09-21 14:48:36 +02:00
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2005-04-16 15:20:36 -07:00
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2015-06-19 10:30:28 +02:00
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2008-03-27 13:06:21 +01:00
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2011-12-08 20:18:57 -05:00
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2008-03-27 13:06:21 +01:00
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2009-09-21 14:48:36 +02:00
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2008-03-27 13:06:21 +01:00
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2009-09-21 14:48:36 +02:00
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fix apparmor dereferencing potentially freed dentry, sanitize __d_path() API
__d_path() API is asking for trouble and in case of apparmor d_namespace_path()
getting just that. The root cause is that when __d_path() misses the root
it had been told to look for, it stores the location of the most remote ancestor
in *root. Without grabbing references. Sure, at the moment of call it had
been pinned down by what we have in *path. And if we raced with umount -l, we
could have very well stopped at vfsmount/dentry that got freed as soon as
prepend_path() dropped vfsmount_lock.
It is safe to compare these pointers with pre-existing (and known to be still
alive) vfsmount and dentry, as long as all we are asking is "is it the same
address?". Dereferencing is not safe and apparmor ended up stepping into
that. d_namespace_path() really wants to examine the place where we stopped,
even if it's not connected to our namespace. As the result, it looked
at ->d_sb->s_magic of a dentry that might've been already freed by that point.
All other callers had been careful enough to avoid that, but it's really
a bad interface - it invites that kind of trouble.
The fix is fairly straightforward, even though it's bigger than I'd like:
* prepend_path() root argument becomes const.
* __d_path() is never called with NULL/NULL root. It was a kludge
to start with. Instead, we have an explicit function - d_absolute_root().
Same as __d_path(), except that it doesn't get root passed and stops where
it stops. apparmor and tomoyo are using it.
* __d_path() returns NULL on path outside of root. The main
caller is show_mountinfo() and that's precisely what we pass root for - to
skip those outside chroot jail. Those who don't want that can (and do)
use d_path().
* __d_path() root argument becomes const. Everyone agrees, I hope.
* apparmor does *NOT* try to use __d_path() or any of its variants
when it sees that path->mnt is an internal vfsmount. In that case it's
definitely not mounted anywhere and dentry_path() is exactly what we want
there. Handling of sysctl()-triggered weirdness is moved to that place.
* if apparmor is asked to do pathname relative to chroot jail
and __d_path() tells it we it's not in that jail, the sucker just calls
d_absolute_path() instead. That's the other remaining caller of __d_path(),
BTW.
* seq_path_root() does _NOT_ return -ENAMETOOLONG (it's stupid anyway -
the normal seq_file logics will take care of growing the buffer and redoing
the call of ->show() just fine). However, if it gets path not reachable
from root, it returns SEQ_SKIP. The only caller adjusted (i.e. stopped
ignoring the return value as it used to do).
Reviewed-by: John Johansen <john.johansen@canonical.com>
ACKed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@vger.kernel.org
2011-12-05 08:43:34 -05:00
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2009-09-21 14:48:36 +02:00
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2008-03-27 13:06:21 +01:00
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2009-09-21 14:48:36 +02:00
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2008-03-27 13:06:21 +01:00
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2009-09-21 14:48:36 +02:00
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fix apparmor dereferencing potentially freed dentry, sanitize __d_path() API
__d_path() API is asking for trouble and in case of apparmor d_namespace_path()
getting just that. The root cause is that when __d_path() misses the root
it had been told to look for, it stores the location of the most remote ancestor
in *root. Without grabbing references. Sure, at the moment of call it had
been pinned down by what we have in *path. And if we raced with umount -l, we
could have very well stopped at vfsmount/dentry that got freed as soon as
prepend_path() dropped vfsmount_lock.
It is safe to compare these pointers with pre-existing (and known to be still
alive) vfsmount and dentry, as long as all we are asking is "is it the same
address?". Dereferencing is not safe and apparmor ended up stepping into
that. d_namespace_path() really wants to examine the place where we stopped,
even if it's not connected to our namespace. As the result, it looked
at ->d_sb->s_magic of a dentry that might've been already freed by that point.
All other callers had been careful enough to avoid that, but it's really
a bad interface - it invites that kind of trouble.
The fix is fairly straightforward, even though it's bigger than I'd like:
* prepend_path() root argument becomes const.
* __d_path() is never called with NULL/NULL root. It was a kludge
to start with. Instead, we have an explicit function - d_absolute_root().
Same as __d_path(), except that it doesn't get root passed and stops where
it stops. apparmor and tomoyo are using it.
* __d_path() returns NULL on path outside of root. The main
caller is show_mountinfo() and that's precisely what we pass root for - to
skip those outside chroot jail. Those who don't want that can (and do)
use d_path().
* __d_path() root argument becomes const. Everyone agrees, I hope.
* apparmor does *NOT* try to use __d_path() or any of its variants
when it sees that path->mnt is an internal vfsmount. In that case it's
definitely not mounted anywhere and dentry_path() is exactly what we want
there. Handling of sysctl()-triggered weirdness is moved to that place.
* if apparmor is asked to do pathname relative to chroot jail
and __d_path() tells it we it's not in that jail, the sucker just calls
d_absolute_path() instead. That's the other remaining caller of __d_path(),
BTW.
* seq_path_root() does _NOT_ return -ENAMETOOLONG (it's stupid anyway -
the normal seq_file logics will take care of growing the buffer and redoing
the call of ->show() just fine). However, if it gets path not reachable
from root, it returns SEQ_SKIP. The only caller adjusted (i.e. stopped
ignoring the return value as it used to do).
Reviewed-by: John Johansen <john.johansen@canonical.com>
ACKed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@vger.kernel.org
2011-12-05 08:43:34 -05:00
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2008-03-27 13:06:21 +01:00
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2008-03-27 13:06:20 +01:00
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2011-12-08 20:18:57 -05:00
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2008-03-27 13:06:20 +01:00
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2009-09-21 14:48:36 +02:00
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2008-03-27 13:06:20 +01:00
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2009-09-21 14:48:36 +02:00
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2008-03-27 13:06:20 +01:00
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2009-09-21 14:48:36 +02:00
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2008-03-27 13:06:20 +01:00
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2015-05-18 02:16:31 -07:00
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2008-03-27 13:06:20 +01:00
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2005-04-16 15:20:36 -07:00
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2013-03-31 13:43:23 -04:00
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2014-07-02 15:22:37 -07:00
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2013-03-31 13:43:23 -04:00
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2014-07-02 15:22:37 -07:00
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2013-03-31 13:43:23 -04:00
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2005-04-16 15:20:36 -07:00
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2006-12-06 20:40:36 -08:00
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2005-04-16 15:20:36 -07:00
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2007-10-10 02:28:42 -07:00
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2015-09-11 13:07:48 -07:00
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2005-04-16 15:20:36 -07:00
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2015-09-11 13:07:48 -07:00
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2005-04-16 15:20:36 -07:00
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2015-09-11 13:07:48 -07:00
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2005-04-16 15:20:36 -07:00
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2015-09-11 13:07:48 -07:00
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2005-04-16 15:20:36 -07:00
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2015-09-11 13:07:48 -07:00
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2005-04-16 15:20:36 -07:00
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2007-07-10 17:22:26 -07:00
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2012-03-23 15:02:54 -07:00
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2016-10-07 17:02:20 -07:00
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2012-03-23 15:02:54 -07:00
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2016-10-07 17:02:20 -07:00
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2015-09-11 13:07:48 -07:00
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2012-03-23 15:02:54 -07:00
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2016-10-07 17:02:20 -07:00
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2012-03-23 15:02:54 -07:00
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2015-09-11 13:07:48 -07:00
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2012-03-23 15:02:54 -07:00
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2016-10-07 17:02:20 -07:00
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2012-03-23 15:02:54 -07:00
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2015-09-11 13:07:48 -07:00
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2012-03-23 15:02:54 -07:00
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2012-03-23 15:02:55 -07:00
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2012-03-23 15:02:54 -07:00
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2016-10-07 17:02:20 -07:00
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2012-03-23 15:02:54 -07:00
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2016-10-07 17:02:20 -07:00
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2012-03-23 15:02:54 -07:00
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2016-10-07 17:02:20 -07:00
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2012-03-23 15:02:54 -07:00
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2016-10-07 17:02:20 -07:00
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2012-03-23 15:02:54 -07:00
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2009-06-17 16:28:05 -07:00
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2012-03-23 15:02:55 -07:00
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2009-06-17 16:28:05 -07:00
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2013-11-14 14:31:56 -08:00
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2015-09-09 15:38:33 -07:00
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2015-11-06 16:32:37 -08:00
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2015-09-09 15:38:33 -07:00
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2015-11-06 16:32:37 -08:00
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2015-09-09 15:38:33 -07:00
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2015-11-06 16:32:37 -08:00
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2015-09-09 15:38:33 -07:00
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2007-07-10 17:22:26 -07:00
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2010-02-08 23:18:22 +00:00
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2010-03-04 09:37:12 -08:00
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2010-02-08 23:18:22 +00:00
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2010-02-22 07:57:17 +00:00
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2010-03-04 09:37:12 -08:00
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2010-02-22 07:57:17 +00:00
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2013-06-21 08:58:21 -04:00
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