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  1. 23 Jul, 2004 1 commit
    • David Mosberger's avatar
      [PATCH] NX: allow architectures to select legacy mode dynamically · 2813e143
      David Mosberger authored 
      On some platforms, you'll want to support READ_IMPLIES_EXEC differently
depending on personality (e.g, native binary vs. x86 binary).

This supports that (and makes the code more readable while at it) by
replacing the old architecture-specific fixed LEGACY_BINARIES macro
define with a architecture-specific "elf_read_implies_exec_binary()"
helper function.

For now, x86 is the only user, and sets the "read implies exec" bit for
legacy apps.  ia64 and x86-64 are likely to want to do their own thing.

Acked by Ingo.
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      2813e143
  3. 22 Jul, 2004 10 commits
  5. 21 Jul, 2004 16 commits
  7. 20 Jul, 2004 5 commits
  9. 18 Jul, 2004 2 commits
    • Ingo Molnar's avatar
      [PATCH] NX: clean up legacy binary support · 1bb0fa18
      Ingo Molnar authored 
      This cleans up legacy x86 binary support by introducing a new
personality bit: READ_IMPLIES_EXEC, and implements Linus' suggestion to
add the PROT_EXEC bit on the two affected syscall entry places,
sys_mprotect() and sys_mmap().  If this bit is set then PROT_READ will
also add the PROT_EXEC bit - as expected by legacy x86 binaries.  The
ELF loader will automatically set this bit when it encounters a legacy
binary.

This approach avoids the problems the previous ->def_flags solution
caused.  In particular this patch fixes the PROT_NONE problem in a
cleaner way (http://lkml.org/lkml/2004/7/12/227), and it should fix the
ia64 PROT_EXEC problem reported by David Mosberger.  Also,
mprotect(PROT_READ) done by legacy binaries will do the right thing as
well. 

the details:

- the personality bit is added to the personality mask upon exec(),
  within the ELF loader, but is not cleared (see the exceptions below). 
  This means that if an environment that already has the bit exec()s a
  new-style binary it will still get the old behavior.

- one exception are setuid/setgid binaries: these will reset the
  bit - thus local attackers cannot manually set the bit and circumvent
  NX protection. Legacy setuid binaries will still get the bit through
  the ELF loader. This gives us maximum flexibility in shaping
  compatibility environments.

- selinux also clears the bit when switching SIDs via exec().

- x86 is the only arch making use of READ_IMPLIES_EXEC currently. Other
  arches will have the pre-NX-patch protection setup they always had.

I have booted an old distro [RH 7.2] and two new PT_GNU_STACK distros
[SuSE 9.2 and FC2] on an NX-capable CPU - they work just fine and all
the mapping details are right. I've checked the PROT_NONE test-utility
as well and it works as expected. I have checked various setuid
scenarios as well involving legacy and new-style binaries.

an improved setarch utility can be used to set the personality bit
manually:

	http://redhat.com/~mingo/nx-patches/setarch-1.4-3.tar.gz

the new '-X' flag does it, e.g.:

	./setarch -X linux /bin/cat /proc/self/maps

will trigger the old protection layout even on a new distro.
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      1bb0fa18
    • David Eger's avatar
      [PATCH] pmac_zilog: serial minors taken failure path fix · 4e8688b2
      David Eger authored 
      I've tracked down the core issue giving me the oops wrt pmac_zilog.

When you have two serial drivers, (e.g. 8250 and PMAC_ZILOG) they both say

"I want to reserve X ports starting with major TTY_MAJOR and minor 64".

By the time pmac_zilog gets there, the ports it requests are already
reserved.  Unfortunately, init_pmz() doesn't check for pmz_register()
failure, and so it merrily goes on to register the half-initialized
pmac_zilog driver with the power management subsystem.

This path provides a proper failure path.

Also: 

Restore ppc configs now that I know people use AT Keyboards on CHRP and PReP
machines, and the zilog driver is no longer Oops'ing.
Signed-off-by: default avatarDavid Eger <eger@havoc.gtf.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      4e8688b2
  11. 17 Jul, 2004 4 commits
    • Linus Torvalds's avatar
      Linux 2.6.8-rc2 · d96a9bf5
      Linus Torvalds authored 
      Ready for the kernel summit in Ottawa...
      d96a9bf5
    • Linus Torvalds's avatar
      Clean up ptrace child exit case. · a61b6024
      Linus Torvalds authored 
      This also fixes it for when the real parent is ignoring
SIGCHLD - noted by David Mosberger.
      a61b6024
    • Andi Kleen's avatar
      [PATCH] Fix i386 bootup with HIGHMEM+SLAB_DEBUG+NUMA and no real · 6bf1545b
      Andi Kleen authored 
      For some reason I booted a NUMA and SLAB_DEBUG i386 kernel on a non
NUMA 512MB machine.  This caused an oops at bootup in change_page_attr.
The reason was that highmem_start_start page ended up zero and 
that triggered the highmem check in change_page_attr when the
slab debug code would unmap a kernel mapping.

Fix is straightforward: if there is no highmem set highmem_start_page
to max_low_pfn+1
      6bf1545b
    • Andi Kleen's avatar
      [PATCH] Fix memory corruption at x86-64 SMP bootup · 32f5543d
      Andi Kleen authored 
      This fixes a long standing corruption bug in the x86-64 code. The SMP
trampoline would corrupt page 2, which was sometimes used for other
data.  This corrupted the ioport/iomem list in some cases and causes
oopses while read /proc/iomem.

Fix is to check the correct location and don't zero it afterwards
because it gets reinitialized for the next CPU anyways.

Thanks to Alexander Nyberg for tracking it down.
      32f5543d
  13. 16 Jul, 2004 2 commits
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