src/sys/kern/sys_process.c, branch stable/2.1 FreeBSD source tree https://cgit-dev.freebsd.org/src/atom?h=stable%2F2.1 1999-09-05T08:39:22Z $Id$ -> $FreeBSD$ 1999-09-05T08:39:22Z Peter Wemm peter@FreeBSD.org 1999-09-05T08:39:22Z urn:sha1:c0b6460abc80cd8953e4eda185c4cad96dcb39c8 Merge from -current: disallow debugger attachment when securelevel > 0. 1997-04-27T21:43:09Z Alexander Langer alex@FreeBSD.org 1997-04-27T21:43:09Z urn:sha1:3325376a4b822a4483ddc1dc613e4db950988f91 Remove trailing whitespace. 1995-05-30T08:16:23Z Rodney W. Grimes rgrimes@FreeBSD.org 1995-05-30T08:16:23Z urn:sha1:9b2e535452929d6f2f798a2c01b23b1f547a0b0f pread/pwrite() should be static. 1995-05-12T21:39:48Z David Greenman dg@FreeBSD.org 1995-05-12T21:39:48Z urn:sha1:c4cf09ffe6c9b6b3f52e7e20c1dcb9da1ccb5cfa Submitted by: sef Add and move declarations to fix all of the warnings from `gcc -Wimplicit' 1995-03-16T18:17:34Z Bruce Evans bde@FreeBSD.org 1995-03-16T18:17:34Z urn:sha1:b5e8ce9f12b66453759f254bdf8bfc53fe2b6948 (except in netccitt, netiso and netns) and most of the warnings from `gcc -Wnested-externs'. Fix all the bugs found. There were no serious ones. Truncate the pte address to a page boundry. This probably won't fix the 1995-02-19T02:50:31Z David Greenman dg@FreeBSD.org 1995-02-19T02:50:31Z urn:sha1:9219d44e66c1d782d3704daeae5aafd5ce282014 panic, but at least it's more correct. Fixed botched previous change - use 'pageno' not initialized to NULL 'kva'. 1995-02-16T00:41:16Z David Greenman dg@FreeBSD.org 1995-02-16T00:41:16Z urn:sha1:eb2463e1fcef7db69e13790b02bd471ce09dddf6 Submitted by: Lars Fredriksen Wire the page table before doing the vm_fault(). Fixes a panic that 1995-02-10T22:36:11Z David Greenman dg@FreeBSD.org 1995-02-10T22:36:11Z urn:sha1:914a63ebd41e9248eab70197c250250de1e9e38d happens when using gdb. Submitted by: John Dyson Fix security holes in sigreturn(), ptrace() and procfs. sigreturn() 1995-01-14T13:20:26Z Bruce Evans bde@FreeBSD.org 1995-01-14T13:20:26Z urn:sha1:20415301cdb107717cce8e836e6476346676af09 attempted to check for insecure and fatal eflags and segment selectors, but missed many cases and got the IOPL check back to front. The other syscalls didn't check at all. sys_process.c, machdep.c: Only allow PT_WRITE_U to write to the registers (ordinary and FP). psl.h, locore.s, machdep.c: Eliminate PSL_MBZ, PSL_MBO and PSL_USERCLR. We are not supposed to assume anything about the reserved bits. Use PSL_USERCHANGE and PSL_KERNEL instead. Rename PSL_USERSET to PSL_USER. exception.s: Define a private label for use by doreti when returning to user mode fails. machdep.c: In syscalls, allow changing only the eflags that can be changed on 486's in user mode (no longer attempt to allow benign IOPL changes; allow changing the nasty PSL_NT; don't allow changing the i586 bits). Don't attempt to check all the cases involving invalid selectors and %eip's. Just check for privilege violations and let the invalid things cause a trap. procfs_machdep.c: Call the ptrace register functions to do all the work for reading and writing ordinary registers and for single stepping. trap.c: Ignore traps caused by PSL_NT being set. Previously, users could cause a fatal trap in user mode by setting PSL_NT and executing an iret, and a fatal trap in kernel mode by setting PSL_NT and making a syscall. PSL_NT was cleared too late and not in enough modes to fix the problem. Make all traps in user mode (except T_NMI) nonfatal. Recover from traps caused by attempting to load invalid user registers in doreti by restarting the traps so that they appear to occur in user mode. --- Fix bogons that I noticed while fixing the above: psl.h: Fix some comments. Uniformize idempotency ifdef. exception.s, machdep.c: Remove rsvd[0-14]. rsvd0 hasn't been reserved since the 486 came out. Replace rsvd0 by `align'. rsvd[0-11] used wrong (magic non-unique) trap numbers. Replace rsvd[1-14] by rsvd. locore.s: Enable alignment check flag on 486's and 586's. machdep.c: Use a better type for kstack[]. Use TFREGP() to find the registers. Reformat ptrace functions from SEF to something closer to KNF. procfs_machdep.c: The wrong pointer to the registers got fixed as a side effect. Implement reading and writing of FP registers. /proc/*/*regs now work (only) for processes that are in memory. Clean up comments. trap.c, trap.h: Remove unused trap types. While in the real world, I had a bad case of being swapped out for a lot of 1994-09-25T19:34:02Z Poul-Henning Kamp phk@FreeBSD.org 1994-09-25T19:34:02Z urn:sha1:bb56ec4a05a1131388e557b919e6ee6b2d0626c9 cycles. While waiting there I added a lot of the extra ()'s I have, (I have never used LISP to any extent). So I compiled the kernel with -Wall and shut up a lot of "suggest you add ()'s", removed a bunch of unused var's and added a couple of declarations here and there. Having a lap-top is highly recommended. My kernel still runs, yell at me if you kernel breaks.