Commit Graph

64 Commits

Author SHA1 Message Date
Julian Elischer
fca666a142 General cleanup of core-dumping code.
Submitted by: Sean Fagan,
1999-09-01 00:29:56 +00:00
Peter Wemm
c3aac50f28 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
Dima Ruban
d44e415624 Don't follow symlinks on coredumps.
Reviewed by:	dillon && security-officer
1999-08-26 17:32:48 +00:00
Peter Wemm
bdbc8c265e Fix the previous warning a different way since the emul_path exposure was
intentional.  Avoid the warning by propagating the const filename through
to elf_load_file() instead.
1999-07-09 19:10:14 +00:00
Peter Wemm
c6bb4a64b8 Minor tweak - don't cause a warning.
I don't know if it was intentional or not, but it would have printed out:
  /compat/linux/foo/bar.so: interpreter not found
If it was, then I've broken it.  De-constifying the 'interp' variable
or carrying the constness through to elf_load_file() are alternatives.
1999-07-09 18:05:03 +00:00
Marcel Moolenaar
7a583b02b6 Also try to load the interpreter without prepending "emul_path". This allows
dynamicly linked binaries to run in a chroot'd environment with "emul_path"
as the new root. The new behavior of loading interpreters is identical to the
principle of overlaying.

PR: 10145
1999-07-05 18:38:29 +00:00
Alan Cox
e972780a11 Add the options MAP_PREFAULT and MAP_PREFAULT_PARTIAL to vm_map_find/insert,
eliminating the need for the pmap_object_init_pt calls in imgact_* and
mmap.

Reviewed by:	David Greenman <dg@root.com>
1999-05-17 00:53:56 +00:00
Alan Cox
e5f13bdd09 Simplify vm_map_find/insert's interface: remove the MAP_COPY_NEEDED option.
It never makes sense to specify MAP_COPY_NEEDED without also specifying
MAP_COPY_ON_WRITE, and vice versa.  Thus, MAP_COPY_ON_WRITE suffices.

Reviewed by:	David Greenman <dg@root.com>
1999-05-14 23:09:34 +00:00
Peter Wemm
e37622b251 Fix a couple of warnings and some bitrot in comments. 1999-05-09 16:04:14 +00:00
John Polstra
c33fe77954 If you merge this into -stable, please increment __FreeBSD_version
in "src/sys/sys/param.h".

Fix the ELF image activator so that it can handle dynamic linkers
which are executables linked at a fixed address.  This improves
compliance with the ABI spec, and it opens the door to possibly
better dynamic linker performance in the future.  I've experimented
a bit with a fixed-address dynamic linker, and it works fine.  But
I don't have any measurements yet to determine whether it's
worthwhile.

Also, remove a few calculations that were never used for anything.

I will increment __FreeBSD_version, since this adds a new capability
to the kernel that the dynamic linker might some day rely upon.
1999-02-20 23:52:34 +00:00
Luoqi Chen
b1028ad122 Hide access to vmspace:vm_pmap with inline function vmspace_pmap(). This
is the preparation step for moving pmap storage out of vmspace proper.

Reviewed by:	Alan Cox	<alc@cs.rice.edu>
		Matthew Dillion	<dillon@apollo.backplane.com>
1999-02-19 14:25:37 +00:00
John Polstra
47633640aa Change the load address of the ELF dynamic linker from "2L*MAXDSIZ"
to an architecture-specific value defined in <machine/elf.h>.  This
solves problems on large-memory systems that have a high value for
MAXDSIZ.

The load address is controlled by a new macro ELF_RTLD_ADDR(vmspace).
On the i386 it is hard-wired to 0x08000000, which is the standard
SVR4 location for the dynamic linker.

On the Alpha, the dynamic linker is loaded MAXDSIZ bytes beyond
the start of the program's data segment.  This is the same place
a userland mmap(0, ...) call would put it, so it ends up just below
all the shared libraries.  The rationale behind the calculation is
that it allows room for the data segment to grow to its maximum
possible size.

These changes have been tested on the i386 for several months
without problems.  They have been tested on the Alpha as well,
though not for nearly as long.  I would like to merge the changes
into 3.1 within a week if no problems have surfaced as a result of
them.
1999-02-07 23:49:56 +00:00
Matthew Dillon
9fdfe602fc Remove MAP_ENTRY_IS_A_MAP 'share' maps. These maps were once used to
attempt to optimize forks but were essentially given-up on due to
    problems and replaced with an explicit dup of the vm_map_entry structure.
    Prior to the removal, they were entirely unused.
1999-02-07 21:48:23 +00:00
John Polstra
6f8126face Correct an "&" operator which should have been "&&".
Submitted by:	mjacob
1999-02-05 22:24:26 +00:00
Mark Newton
3b351cc1d3 Additional note on last rev: The rationale for this is to allow you
to run Solaris executables (or executables from any other ELF system)
directly off the CD-ROM without having to waste megabytes of disk
by copying them to another filesystem just to brand them.
1999-02-05 03:47:47 +00:00
Mark Newton
f8b3601e08 Created sysctl kern.fallback_elf_brand. Defaults to "none", which will
give the same behaviour produced before today.  If sysadmin sets it
to a valid ELF brand, ELF image activator will attempt to run unbranded
ELF exectutables as if they were branded with that value.

Suggested by: Dima Ruban <dima@best.net>
1999-02-05 03:43:18 +00:00
Mark Newton
096977fae7 Provide elf_brand_inuse() as a method an emulator can use to find out
whether it is currently in use (which is kinda useful when it's about
to unload itself:  Lockups are never very much fun, are they?).
1999-02-04 12:42:39 +00:00
Matthew Dillon
820ca326e1 *_execsw static structures cannot be const due to the way they interact
with EXEC_SET, DECLARE_MODULE, and module_register.  Specifically,
    module_register.  We may eventually be able to make these const, but
    not now.
1999-01-29 22:59:43 +00:00
Matthew Dillon
d254af07a1 Fix warnings in preparation for adding -Wall -Wcast-qual to the
kernel compile
1999-01-27 21:50:00 +00:00
Julian Elischer
88c5ea4574 Enable Linux threads support by default.
This takes the conditionals out of the code that has been tested by
various people for a while.
ps and friends (libkvm) will need a recompile as some proc structure
changes are made.

Submitted by:	"Richard Seaman, Jr." <dick@tar.com>
1999-01-26 02:38:12 +00:00
Julian Elischer
6626c6045c Reviewed by: Luoqi Chen, Jordan Hubbard
Submitted by:	 "Richard Seaman, Jr." <lists@tar.com>
Obtained from:	linux :-)

Code to allow Linux Threads to run under FreeBSD.

By default not enabled
This code is dependent on the conditional
COMPAT_LINUX_THREADS (suggested by Garret)
This is not yet a 'real' option but will be within some number of hours.
1998-12-19 02:55:34 +00:00
Archie Cobbs
2127f26023 Examine all occurrences of sprintf(), strcat(), and str[n]cpy()
for possible buffer overflow problems. Replaced most sprintf()'s
with snprintf(); for others cases, added terminating NUL bytes where
appropriate, replaced constants like "16" with sizeof(), etc.

These changes include several bug fixes, but most changes are for
maintainability's sake. Any instance where it wasn't "immediately
obvious" that a buffer overflow could not occur was made safer.

Reviewed by:	Bruce Evans <bde@zeta.org.au>
Reviewed by:	Matthew Dillon <dillon@apollo.backplane.com>
Reviewed by:	Mike Spengler <mks@networkcs.com>
1998-12-04 22:54:57 +00:00
Poul-Henning Kamp
f5ef029e92 Nitpicking and dusting performed on a train. Removes trivial warnings
about unused variables, labels and other lint.
1998-10-25 17:44:59 +00:00
Peter Wemm
52c24af701 Some cleanups and optimizations:
- Use the system headers method for Elf32/Elf64 symbol compatability
- get rid of the UPRINTF debugging.
- check the ELF header for compatability much more completely
- optimize the section mapper.  Use the same direct VM interfaces that
  imgact_aout.c and kern_exec.c use.
- Check the return codes from the vm_* functions better.  Some return
  KERN_* results, not an errno.
- prefault the page tables to reduce startup faults on page tables like
  a.out does.
- reset the segment protection to zero for each loop, otherwise each
  segment could get progressively more privs. (eg: if the first was
  read/write/execute, and the second was meant to be read/execute, the
  bug would make the second r/w/x too.  In practice this was not a
  problem because executables are normally laid out with text first.)
- Don't impose arbitary limits.  Use the limits on headers imposed by
  the need to fit them into one page.
- Remove unused switch() cases now that the verbose debugging is gone.

I've been using an earlier version of this for a month or so.
This sped up ELF exec speed a bit for me but I found it hard to get
consistant benchmarks when I tested it last (a few weeks ago).
I'm still bothered by the page read out of order caused by the
transition from data to bss. This which requires either part filling the
transition page or clearing the remainder.
1998-10-18 15:55:12 +00:00
Peter Wemm
aa855a598d *gulp*. Jordan specifically OK'ed this..
This is the bulk of the support for doing kld modules.  Two linker_sets
were replaced by SYSINIT()'s.  VFS's and exec handlers are self registered.
kld is now a superset of lkm.  I have converted most of them, they will
follow as a seperate commit as samples.
This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
Doug Rabson
216a0f2d7f Don't frob the user stack directly, use suword instead. This fixes the
elf_freebsd_fixup() panic which many people have noticed on the alpha.
1998-10-15 09:52:19 +00:00
David Greenman
6cde7a165f Fixed two potentially serious classes of bugs:
1) The vnode pager wasn't properly tracking the file size due to
   "size" being page rounded in some cases and not in others.
   This sometimes resulted in corrupted files. First noticed by
   Terry Lambert.
   Fixed by changing the "size" pager_alloc parameter to be a 64bit
   byte value (as opposed to a 32bit page index) and changing the
   pagers and their callers to deal with this properly.
2) Fixed a bogus type cast in round_page() and trunc_page() that
   caused some 64bit offsets and sizes to be scrambled. Removing
   the cast required adding casts at a few dozen callers.
   There may be problems with other bogus casts in close-by
   macros. A quick check seemed to indicate that those were okay,
   however.
1998-10-13 08:24:45 +00:00
John Polstra
d1dbc69449 If an ELF executable has a recognized brand, then believe it.
Formerly, the heuristic involving the interpreter path took
precedence.

Also, print a better error message if the brand is missing or not
recognized.  If there is no brand at all, give the user a hint that
"brandelf" needs to be run.
1998-10-11 19:22:07 +00:00
John Polstra
7b4c881cef Fix a bug which caused the dynamic linker pathname in the PT_INTERP
program header entry to be ignored if a recognized brand was found.
1998-10-03 04:12:09 +00:00
John Polstra
0ff27d31ea Restore the core-dumping of all writable segments for ELF executables,
minus the NULL pointer dereference in rev. 1.33.  Also simplify
things somewhat by eliminating one traversal of the VM map entries.
Finally, eliminate calls to vm_map_{un,}lock_read() which aren't
needed here.  I originally took them from procfs_map.c, but here
we know we are dealing only with the map of the current process.
1998-09-16 02:04:05 +00:00
John Polstra
dada02781d Erk. Revert back to 1.31, dumping only data and stack to the core
file, until I can solve a panic that has just cropped up.
1998-09-15 22:23:12 +00:00
John Polstra
6bb20c5063 When choosing segments to write to the core file, don't assume that
writable implies readable.
1998-09-15 22:07:20 +00:00
John Polstra
8162da636b Instead of just the data and stack segments, include all writable
segments (except memory-mapped devices) in the ELF core file.  This
is really nice.  You get access to the data areas of all shared
libraries, and even to files that are mapped read-write.

In the future, it might be good to add a new resource limit in the
spirit of RLIMIT_CORE.  It would specify the maximum sized writable
segment to include in core dumps.  Segments larger than that would
be omitted.  This would be useful for programs that map very large
files read/write but that still would like to get usable core dumps.
1998-09-15 21:46:34 +00:00
John Polstra
8c64af4f75 Viola! The kernel now generates standard ELF core dumps for ELF
executables.

Currently only data and stack are included in the core dumps.  I am
looking into adding the other (mmapped) writable segments as well.
1998-09-14 22:46:08 +00:00
John Polstra
22d4b0fb41 Add provisions for variant core dump file formats, depending on the
object format of the executable being dumped.  This is the first
step toward producing ELF core dumps in the proper format.  I will
commit the code to generate the ELF core dumps Real Soon Now.  In
the meantime, ELF executables won't dump core at all.  That is
probably no less useful than dumping a.out-style core dumps as they
have done until now.

Submitted by:	Alex <garbanzo@hooked.net> (with very minor changes by me)
1998-09-14 05:36:51 +00:00
Doug Rabson
a9d81f7c5c Default to FreeBSD if no brand detected. This makes life easier when
bootstrapping from NetBSD/alpha.
1998-07-29 18:39:35 +00:00
Bruce Evans
7cd99438f8 Cast u_longs to uintptr_t before casting them to pointers. Don't
attempt to even partially support systems with function pointers
larger than object pointers.
1998-07-15 05:00:26 +00:00
Bruce Evans
ed62fb52ec Fixed printf format errors. 1998-07-11 10:28:47 +00:00
Doug Rabson
2e91d07af9 Fix a typo which prevented i386 elf from working at all (including Linux
emulated elf binaries).
1998-06-08 09:19:35 +00:00
Doug Rabson
ecbb00a262 This commit fixes various 64bit portability problems required for
FreeBSD/alpha.  The most significant item is to change the command
argument to ioctl functions from int to u_long.  This change brings us
inline with various other BSD versions.  Driver writers may like to
use (__FreeBSD_version == 300003) to detect this change.

The prototype FreeBSD/alpha machdep will follow in a couple of days
time.
1998-06-07 17:13:14 +00:00
Eivind Eklund
288078be0f Translate T_PROTFLT to SIGSEGV instead of SIGBUS when running under
Linux emulation.  This make Allegro Common Lisp 4.3 work under
FreeBSD!

Submitted by: Fred Gilham <gilham@csl.sri.com>
Commented on by: bde, dg, msmith, tg
Hoping he got everything right:  eivind
1998-04-28 18:15:08 +00:00
Bruce Evans
3c1300a6b3 Removed unused #includes. 1998-03-28 13:25:01 +00:00
Peter Wemm
c8a7999933 Update the ELF image activator to use some of the exec resources rather
than rolling it's own.  This means that it now uses the "safe"
exec_map_first_page() to get the ld.so headers rather than risking a panic
on a page fault failure (eg: NFS server goes down).
Since all the ELF tools go to a lot of trouble to make sure everything
lives in the first page for executables, this is a win.  I have not seen
any ELF executable on any system where all the headers didn't fit in the
first page with lots of room to spare.
I have been running variations of this code for some time on my pure ELF
systems.
1998-03-02 05:47:58 +00:00
Eivind Eklund
303b270b0a Staticize. 1998-02-09 06:11:36 +00:00
Peter Wemm
1560a9d538 We were (I think) missing a vrele() on the vnode for the object loaded
via PT_INTERP (usually /usr/libexec/ld-elf.so.1).
1997-09-21 03:13:21 +00:00
John Dyson
5856e12e69 Fully implement vfork. Vfork is now much much faster than even our
fork. (On my machine, fork is about 240usecs, vfork is 78usecs.)

Implement rfork(!RFPROC !RFMEM), which allows a thread to divorce its memory
	from the other threads of a group.

Implement rfork(!RFPROC RFCFDG), which closes all file descriptors, eliminating
	possible existing shares with other threads/processes.

Implement rfork(!RFPROC RFFDG), which divorces the file descriptors for a
	thread from the rest of the group.

Fix the case where a thread does an exec.  It is almost nonsense for a thread
	to modify the other threads address space by an exec, so we
	now automatically divorce the address space before modifying it.
1997-04-13 01:48:35 +00:00
Bruce Evans
d8a4f230d5 Use OID_AUTO instead of magic number for old sysctl debug.elf_trace. The
magic number conflicted with the one for the Lite2 sysctl debug.busyprt.

Staticized some variables.

Removed unused #includes.
1997-04-01 10:41:48 +00:00
Bruce Evans
3ac4d1ef0c Don't #include <sys/fcntl.h> in <sys/file.h> if KERNEL is defined.
Fixed everything that depended on getting fcntl.h stuff from the wrong
place.  Most things don't depend on file.h stuff at all.
1997-03-23 03:37:54 +00:00
Peter Wemm
6875d25465 Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not
ready for it yet.
1997-02-22 09:48:43 +00:00
John Dyson
996c772f58 This is the kernel Lite/2 commit. There are some requisite userland
changes, so don't expect to be able to run the kernel as-is (very well)
without the appropriate Lite/2 userland changes.

The system boots and can mount UFS filesystems.

Untested: ext2fs, msdosfs, NFS
Known problems: Incorrect Berkeley ID strings in some files.
		Mount_std mounts will not work until the getfsent
		library routine is changed.

Reviewed by:	various people
Submitted by:	Jeffery Hsu <hsu@freebsd.org>
1997-02-10 02:22:35 +00:00