Bug #413278 “stack protector guard value does not lead with a NU...” : Bugs : eglibc package : Ubuntu

Revision history for this message

In Sourceware.org Bugzilla #10149, Kees Cook (kees) wrote on 2009-05-12:

#8

When building the stack guard, it has been traditionally important to have the
value start (in memory) with a zero byte to protect the guard value (and the
rest of the stack past it) from being read via strcpy, etc.

This patch reduces the number of random bytes by one, leaving the leading zero byte.

Revision history for this message

In Sourceware.org Bugzilla #10149, Kees Cook (kees) wrote on 2009-05-12:

#9

Created attachment 3933
keep leading zero

Revision history for this message

In Sourceware.org Bugzilla #10149, Kees Cook (kees) wrote on 2009-05-14:

#10

I should clarify -- the read-blocking is nice, but the more common reason the
leading zero is important is to avoid the guard being written as part of a
larger overflow being written out by a str* function, if its value were leaked
to an attacker in some other way.

Kees Cook (kees) on 2009-08-13

Changed in eglibc (Ubuntu Karmic):
assignee:	nobody → Kees Cook (kees)
importance:	Undecided → Medium
milestone:	none → karmic-alpha-5
Changed in eglibc (Ubuntu Jaunty):
assignee:	nobody → Kees Cook (kees)
importance:	Undecided → Medium
status:	New → Invalid
Changed in glibc (Ubuntu Karmic):
status:	New → Invalid
Changed in eglibc (Ubuntu Jaunty):
assignee:	Kees Cook (kees) → nobody

Kees Cook (kees) on 2009-08-13

Changed in glibc (Ubuntu Jaunty):
assignee:	nobody → Kees Cook (kees)
importance:	Undecided → Medium

Revision history for this message

Launchpad Janitor (janitor) wrote on 2009-08-13:

#1

This bug was fixed in the package eglibc - 2.10.1-0ubuntu7

---------------
eglibc (2.10.1-0ubuntu7) karmic; urgency=low

  * patches/ubuntu/submitted-leading-zero-stack-guard.diff: require that
    the stack guard start with a zero-byte to protect against str*
    function more completely (LP: #413278).

-- Kees Cook <email address hidden> Wed, 12 Aug 2009 16:35:43 -0700

Changed in eglibc (Ubuntu Karmic):
status:	New → Fix Released

Bug Watch Updater (bug-watch-updater) on 2009-08-13

Changed in glibc:
status:	Unknown → Confirmed

Revision history for this message

Kees Cook (kees) wrote on 2009-08-25:

#2

glibc_2.9-4ubuntu6.1.debdiff Edit (2.6 KiB, text/plain)

Uploaded to -proposed...

description:

updated

Revision history for this message

Martin Pitt (pitti) wrote on 2009-08-31:

#3

Is that a regression from intrepid, or cause serious bugs? In particular, would this have helped to mitigate vulnerabilities which were discovered/fixed in jaunty?

This does not match the SRU criteria at first sight, so please elaborate about the impact a bit. The regression potential on this one seems to be excessively high to me, since it could potentially affect all programs (and some might do weird tricks with the stack, and got fixed later on for karmic).

Changed in glibc (Ubuntu Jaunty):
status:	New → Incomplete

Revision history for this message

Kees Cook (kees) wrote on 2009-08-31:

#4

This is a regression from Intrepid, yes. Upstream glibc changed how they constructed the random value, losing this protection from strcpy-style overflows. While I do not have any active examples of exploits that have read-access to stack memory and also a strcpy, I do feel the regression potential is low given that this patch does not change the locations of the stack protector, it just limits the first byte to 0.

Changed in glibc (Ubuntu Jaunty):
status:	Incomplete → New

Revision history for this message

Martin Pitt (pitti) wrote on 2009-08-31:

#5

Accepted glibc into jaunty-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

tags:	added: regression-release
Changed in glibc (Ubuntu Jaunty):
status:	New → Fix Committed
tags:	added: verification-needed

Revision history for this message

Steve Beattie (sbeattie) wrote on 2009-09-11:

#6

I have reproduced the issue with glibc from jaunty, 2.9-4ubuntu6, and can confirm that the version of glibc in jaunty-proposed, 2.9-4ubuntu6.1, has a stack canary value that contains a leading NULL byte. I've verified that the the glibc-security regression tests all pass on both i386 and amd64 with the version of glibc in proposed, as well ensuring that i386, amd64, and lpia systems successfully reboot and bring up a gnome desktop sessions, and have also ran through a few of the other qa-regression-tests to verify that the libc update didn't break anything with them.

The one downside to using a leading NULL byte is this reduces the search space that an attacker would to go through to brute-force an attempted overflow while guessing at the canary value; for 64 bit platforms, this only reduces the space to 56 bits which is tolerable, but on a 32 bit platform, the possible canary value space is reduced to 24 bits, which makes it possibly easier to successfully brute-force before the attack is noticed. (Note that one of the published weaknesses against ASLR is that on 32 bit platforms, the effective randomness is around 20-21 bits,and thus easily brute-forcible.) OTOH, given that a large percentage of such vulnerabilities are due to poor C string handling, this fix is a reasonable tradeoff given that it makes exploitation harder for those vulnerabilities. In an ideal world, the stack canary would be 64 or 128 bits wide on all platforms, but that has the potential to introduce noticable performance issues.

Marking verification-done.

tags:

added: verification-done
removed: verification-needed

Revision history for this message

Launchpad Janitor (janitor) wrote on 2009-09-14:

#7

This bug was fixed in the package glibc - 2.9-4ubuntu6.1

---------------
glibc (2.9-4ubuntu6.1) jaunty-proposed; urgency=low

  * patches/ubuntu/submitted-leading-zero-stack-guard.diff: require that
    the stack guard start with a zero-byte to protect against str*
    function more completely (LP: #413278).

-- Kees Cook <email address hidden> Tue, 25 Aug 2009 00:06:51 -0700

Changed in glibc (Ubuntu Jaunty):
status:	Fix Committed → Fix Released

Revision history for this message

In Sourceware.org Bugzilla #10149, Drepper-fsp (drepper-fsp) wrote on 2011-05-15:

#11

I've applied a cleaner and more efficient patch.

Bug Watch Updater (bug-watch-updater) on 2011-05-26

Changed in glibc:
importance:	Unknown → Medium
status:	Confirmed → Fix Released

Revision history for this message

In Sourceware.org Bugzilla #10149, Kimolsun2020 (kimolsun2020) wrote on 2021-09-05:

#12

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Revision history for this message

In Sourceware.org Bugzilla #10149, Mehmetgelisin (mehmetgelisin) wrote on 2021-09-10:

#13

Download full text (5.3 KiB)

gdb/dwarf: disable per-BFD resource sharing for -readnow objfiles

New in v2:

- Disable sharing only for -readnow objfiles, not all objfiles.

As described in PR 27541, we hit an internal error when loading a binary
the standard way and then loading it with the -readnow option:

        $ ./gdb -nx -q --data-directory=data-directory ~/a.out -ex "set confirm off" -ex "file -readnow ~/a.out"
        Reading symbols from /home/simark/a.out...
        Reading symbols from ~/a.out...
        /home/simark/src/binutils-gdb/gdb/dwarf2/read.c:8098: internal-error: void create_all_comp_units(dwarf2_per_objfile*): Assertion `per_objfile->per_bfd->all_comp_units.empty ()' failed.

    This is a recurring problem that exposes a design issue in the DWARF
    per-BFD sharing feature. Things work well when loading a binary with
    the same method (with/without index, with/without readnow) twice in a
    row. But they don't work so well when loading a binary with different
    methods. See this previous fix, for example:

efb763a5ea35 ("gdb: check for partial symtab presence in dwarf2_initialize_objfile")

That one handled the case where the first load is normal (uses partial
symbols) and the second load uses an index.

    The problem is that when loading an objfile with a method A, we create a
    dwarf2_per_bfd and some dwarf2_per_cu_data and initialize them with the
    data belonging to that method. When loading another obfile sharing the
    same BFD but with a different method B, it's not clear how to re-use the
    dwarf2_per_bfd/dwarf2_per_cu_data previously created, because they
    contain the data specific to method A. https://komiya-dental.com/

    I think the most sensible fix would be to not share a dwarf2_per_bfd
    between two objfiles loaded with different methods. That means that two
    objfiles sharing the same BFD and loaded the same way would share a
    dwarf2_per_bfd. Two objfiles sharing the same BFD but loaded with
    different methods would use two different dwarf2_per_bfd structures. http://www.iu-bloomington.com/

    However, this isn't a trivial change. So to fix the known issue quickly
    (including in the gdb 10 branch), this patch just disables all
    dwarf2_per_bfd sharing for objfiles using READNOW.

    Generalize the gdb.base/index-cache-load-twice.exp test to test all
    the possible combinations of loading a file with partial symtabs, index
    and readnow. Move it to gdb.dwarf2, since it really exercises features
    of the DWARF
gdb/dwarf: disable per-BFD resource sharing for -readnow objfiles
     https://www.webb-dev.co.uk/
    New in v2:

- Disable sharing only for -readnow objfiles, not all objfiles.

    As described in PR 27541, we hit an internal error when loading a binary
    the standard way and then loading it with the -readnow option:
    https://waytowhatsnext.com/
        $ ./gdb -nx -q --data-directory=data-directory ~/a.out -ex "set confirm off" -ex "file -readnow ~/a.out"
        Reading symbols from /home/simark/a.out...
        Reading symbols from ~/a.out...
        /home/simark/src/binut...

gdb/dwarf: disable per-BFD resource sharing for -readnow objfiles
    
    New in v2:
    
      - Disable sharing only for -readnow objfiles, not all objfiles.
    
    As described in PR 27541, we hit an internal error when loading a binary
    the standard way and then loading it with the -readnow option:
    
        $ ./gdb -nx -q --data-directory=data-directory ~/a.out -ex "set confirm off" -ex "file -readnow ~/a.out"
        Reading symbols from /home/simark/a.out...
        Reading symbols from ~/a.out...
        /home/simark/src/binutils-gdb/gdb/dwarf2/read.c:8098: internal-error: void create_all_comp_units(dwarf2_per_objfile*): Assertion `per_objfile->per_bfd->all_comp_units.empty ()' failed.
    
    This is a recurring problem that exposes a design issue in the DWARF
    per-BFD sharing feature.  Things work well when loading a binary with
    the same method (with/without index, with/without readnow) twice in a
    row.  But they don't work so well when loading a binary with different
    methods.  See this previous fix, for example:
    
        efb763a5ea35 ("gdb: check for partial symtab presence in dwarf2_initialize_objfile")
    
    That one handled the case where the first load is normal (uses partial
    symbols) and the second load uses an index.
    
    The problem is that when loading an objfile with a method A, we create a
    dwarf2_per_bfd and some dwarf2_per_cu_data and initialize them with the
    data belonging to that method.  When loading another obfile sharing the
    same BFD but with a different method B, it's not clear how to re-use the
    dwarf2_per_bfd/dwarf2_per_cu_data previously created, because they
    contain the data specific to method A. https://komiya-dental.com/ 
    
    I think the most sensible fix would be to not share a dwarf2_per_bfd
    between two objfiles loaded with different methods.  That means that two
    objfiles sharing the same BFD and loaded the same way would share a
    dwarf2_per_bfd.  Two objfiles sharing the same BFD but loaded with
    different methods would use two different dwarf2_per_bfd structures. http://www.iu-bloomington.com/
    
    However, this isn't a trivial change.  So to fix the known issue quickly
    (including in the gdb 10 branch), this patch just disables all
    dwarf2_per_bfd sharing for objfiles using READNOW.
    
    Generalize the gdb.base/index-cache-load-twice.exp test to test all
    the possible combinations of loading a file with partial symtabs, index
    and readnow.  Move it to gdb.dwarf2, since it really exercises features
    of the DWARF
gdb/dwarf: disable per-BFD resource sharing for -readnow objfiles
     https://www.webb-dev.co.uk/
    New in v2:
    
      - Disable sharing only for -readnow objfiles, not all objfiles.
    
    As described in PR 27541, we hit an internal error when loading a binary
    the standard way and then loading it with the -readnow option:
    https://waytowhatsnext.com/  
        $ ./gdb -nx -q --data-directory=data-directory ~/a.out -ex "set confirm off" -ex "file -readnow ~/a.out"
        Reading symbols from /home/simark/a.out...
        Reading symbols from ~/a.out...
        /home/simark/src/binutils-gdb/gdb/dwarf2/read.c:8098: internal-error: void create_all_comp_units(dwarf2_per_objfile*): Assertion `per_objfile->per_bfd->all_comp_units.empty ()' failed.
     http://www.acpirateradio.co.uk/ 
    This is a recurring problem that exposes a design issue in the DWARF
    per-BFD sharing feature.  Things work well when loading a binary with
    the same method (with/without index, with/without readnow) twice in a
    row.  But they don't work so well when loading a binary with different
    methods.  See this previous fix, for example: http://www.logoarts.co.uk/ 
    
        efb763a5ea35 ("gdb: check for partial symtab presence in dwarf2_initialize_objfile")
    
    That one handled the case where the first load is normal (uses partial
    symbols) and the second load uses an index. http://www.slipstone.co.uk/
    
    The problem is that when loading an objfile with a method A, we create a
    dwarf2_per_bfd and some dwarf2_per_cu_data and initialize them with the
    data belonging to that method.  When loading another obfile sharing the
    same BFD but with a different method B, it's not clear how to re-use the
    dwarf2_per_bfd/dwarf2_per_cu_data previously created, because they
    contain the data specific to method A. http://embermanchester.uk/ 
    
    I think the most sensible fix would be to not share a dwarf2_per_bfd
    between two objfiles loaded with different methods. http://connstr.net/   That means that two 
    objfiles sharing the same BFD and loaded the same way would share a
    dwarf2_per_bfd.  Two objfiles http://joerg.li/ sharing the same BFD but loaded with
    different methods would use two different dwarf2_per_bfd structures. http://www.jopspeech.com/
    
    However, this isn't a trivial change.  So to fix the known issue quickly
    (including in the gdb 10 branch), this patch just disables all http://www.wearelondonmade.com/
    dwarf2_per_bfd sharing for objfiles using READNOW.
    
    Generalize the gdb.base/index-cache-load-twice.exp test to test all http://www.compilatori.com/ 
    the possible combinations of loading a file with partial symtabs, index
    and readnow.  Move it to gdb.dwarf2, since it really exercises features
    of the DWARF  http://www-look-4.com/

Revision history for this message

In Sourceware.org Bugzilla #10149, Gulsenenginar (gulsenenginar) wrote on 2021-10-09:

#14

Download full text (4.2 KiB)

$ ./gdb -nx -q --data-directory=data-directory ~/a.out -ex "set confirm off" -ex "file -readnow ~/a.out" http://www-look-4.com/category/technology/
        Reading symbols from /home/simark/a.out...
        Reading symbols from ~/a.out...
        /home/simark/src/binutils-gdb/gdb/dwarf2/read.c:8098: https://komiya-dental.com/shopping/safety-for-online-shopping/ internal-error: void create_all_comp_units(dwarf2_per_objfile*): Assertion `per_objfile->per_bfd->all_comp_units.empty ()' failed.
    http://www.iu-bloomington.com/health/health-and-cannabis/
    This is a recurring problem that exposes a design issue in the DWARF
    per-BFD sharing feature. Things work well when loading a binary with https://waytowhatsnext.com/crypto/bought-house-with-bitcoin/
    the same method (with/without index, with/without readnow) twice in a
    row. But they don't work so well when loading a binary with different
    methods. See this previous fix, for example:
    http://www.wearelondonmade.com/category/health/
        efb763a5ea35 ("gdb: check for partial symtab presence in dwarf2_initialize_objfile")

That one handled the case where the first load is normal (uses partial
symbols) and the second load uses an index. http://www.jopspeech.com/category/services/

    The problem is that when loading an objfile with a method A, we create a
    dwarf2_per_bfd and some dwarf2_per_cu_data and initialize them with the
    data belonging to that method. http://joerg.li/category/health/ When loading another obfile sharing the
    same BFD but with a different method B, it's not clear how to re-use the
    dwarf2_per_bfd/dwarf2_per_cu_data previously created, because they
    contain the data specific to method A http://connstr.net/category/health/
$ ./gdb -nx -q --data-directory=data-directory ~/a.out -ex "set confirm off" -ex "file -readnow ~/a.out" http://embermanchester.uk/category/health/
        Reading symbols from /home/simark/a.out...
        Reading symbols from ~/a.out...
        /home/simark/src/binutils-gdb/gdb/dwarf2/read.c:8098: internal-error: void create_all_comp_units(dwarf2_per_objfile*): Assertion http://www.slipstone.co.uk/category/health/ `per_objfile->per_bfd->all_comp_units.empty ()' failed.

    This is a recurring problem that exposes a design issue in the DWARF http://www.logoarts.co.uk/category/services/
    per-BFD sharing feature. Things work well when loading a binary with
    the same method (with/without index, with/without readnow) twice in a
    row. But they don't work so well when http://www.acpirateradio.co.uk/category/tech/ loading a binary with different
    methods. See this previous fix, for example:

        efb763a5ea35 ("gdb: check for partial symtab presence in dwarf2_initialize_objfile")
     http://www.compilatori.com/category/health/
    That one handled the case where the first load is normal (uses partial
    symbols) and the second load uses an index.

    The problem is that when loading an objfile with a method A, we create a
    dwarf2_per_bfd and some dwarf2_per_cu_data and initialize them with the
    data belonging to that method. When loading another obfile sharing the
...

$ ./gdb -nx -q --data-directory=data-directory ~/a.out -ex "set confirm off" -ex "file -readnow ~/a.out" http://www-look-4.com/category/technology/
        Reading symbols from /home/simark/a.out...
        Reading symbols from ~/a.out...
        /home/simark/src/binutils-gdb/gdb/dwarf2/read.c:8098: https://komiya-dental.com/shopping/safety-for-online-shopping/ internal-error: void create_all_comp_units(dwarf2_per_objfile*): Assertion `per_objfile->per_bfd->all_comp_units.empty ()' failed.
    http://www.iu-bloomington.com/health/health-and-cannabis/
    This is a recurring problem that exposes a design issue in the DWARF
    per-BFD sharing feature.  Things work well when loading a binary with https://waytowhatsnext.com/crypto/bought-house-with-bitcoin/ 
    the same method (with/without index, with/without readnow) twice in a
    row.  But they don't work so well when loading a binary with different
    methods.  See this previous fix, for example:
    http://www.wearelondonmade.com/category/health/
        efb763a5ea35 ("gdb: check for partial symtab presence in dwarf2_initialize_objfile")
    
    That one handled the case where the first load is normal (uses partial
    symbols) and the second load uses an index. http://www.jopspeech.com/category/services/
    
    The problem is that when loading an objfile with a method A, we create a
    dwarf2_per_bfd and some dwarf2_per_cu_data and initialize them with the
    data belonging to that method. http://joerg.li/category/health/  When loading another obfile sharing the
    same BFD but with a different method B, it's not clear how to re-use the
    dwarf2_per_bfd/dwarf2_per_cu_data previously created, because they
    contain the data specific to method A http://connstr.net/category/health/
$ ./gdb -nx -q --data-directory=data-directory ~/a.out -ex "set confirm off" -ex "file -readnow ~/a.out" http://embermanchester.uk/category/health/
        Reading symbols from /home/simark/a.out...
        Reading symbols from ~/a.out...
        /home/simark/src/binutils-gdb/gdb/dwarf2/read.c:8098: internal-error: void create_all_comp_units(dwarf2_per_objfile*): Assertion http://www.slipstone.co.uk/category/health/  `per_objfile->per_bfd->all_comp_units.empty ()' failed.
    
    This is a recurring problem that exposes a design issue in the DWARF http://www.logoarts.co.uk/category/services/ 
    per-BFD sharing feature.  Things work well when loading a binary with
    the same method (with/without index, with/without readnow) twice in a
    row.  But they don't work so well when http://www.acpirateradio.co.uk/category/tech/ loading a binary with different
    methods.  See this previous fix, for example:
     
        efb763a5ea35 ("gdb: check for partial symtab presence in dwarf2_initialize_objfile")
     http://www.compilatori.com/category/health/
    That one handled the case where the first load is normal (uses partial
    symbols) and the second load uses an index.
    
    The problem is that when loading an objfile with a method A, we create a
    dwarf2_per_bfd and some dwarf2_per_cu_data and initialize them with the
    data belonging to that method.  When loading another obfile sharing the
    same BFD but with a different method B, it's not clear how to re-use the
    dwarf2_per_bfd/dwarf2_per_cu_data previously created, because they
    contain the data specific to method A https://www.webb-dev.co.uk/health/health-and-cannabis/
$ ./gdb -nx -q --data-directory=data-directory ~/a.out -ex "set confirm off" -ex "file -readnow ~/a.out"
        Reading symbols from /home/simark/a.out...
        Reading symbols from ~/a.out...
        /home/simark/src/binutils-gdb/gdb/dwarf2/read.c:8098: internal-error: void create_all_comp_units(dwarf2_per_objfile*): Assertion `per_objfile->per_bfd->all_comp_units.empty ()' failed.
    
    This is a recurring problem that exposes a design issue in the DWARF
    per-BFD sharing feature.  Things work well when loading a binary with
    the same method (with/without index, with/without readnow) twice in a
    row.  But they don't work so well when loading a binary with different
    methods.  See this previous fix, for example:
    
        efb763a5ea35 ("gdb: check for partial symtab presence in dwarf2_initialize_objfile"

Revision history for this message

In Sourceware.org Bugzilla #10149, Glassmtech (glassmtech) wrote on 2021-10-24:

#17

Download full text (3.5 KiB)

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Ubuntu
eglibc package

stack protector guard value does not lead with a NULL byte

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	Status	Importance	Assigned to	Milestone
GLibC	Fix Released	Medium	sourceware-bugs #10149
eglibc (Ubuntu)	Fix Released	Medium	Kees Cook	Ubuntu karmic-alpha-5
Jaunty	Invalid	Medium	Unassigned
Karmic	Fix Released	Medium	Kees Cook	Ubuntu karmic-alpha-5
glibc (Ubuntu)	Invalid	Undecided	Unassigned
Jaunty	Fix Released	Medium	Kees Cook
Karmic	Invalid	Undecided	Unassigned

Ubuntueglibc package

stack protector guard value does not lead with a NULL byte

Bug Description

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Ubuntu
eglibc package