forum.lissyara.su

Код: Выделить всё

#expr 529 / 23
23
#uname -rs
FreeBSD 4.9-RELEASE

#expr 529 / 23
23
#uname -rs
FreeBSD 7.0-CURRENT

Код: Выделить всё

while true; do expr 529 / 23; done
23
23
...

Код: Выделить всё

> sh -c 'echo $((529 / 23))'
> csh -c '@ out= 529 / 23; echo $out'
> expr 529 / 23
> echo 529 / 23 | bc
> echo 529 23 / p | dc
> awk 'BEGIN { print 529 / 23 }'
> echo 'main() { printf("%d\n", 529 / 23); }' | cc -xc -; ./a.out

Код: Выделить всё

int
kvm_close(kd)
        kvm_t *kd;
{
        int error = 0;

        if (kd->pmfd >= 0)
                error |= close(kd->pmfd);
        if (kd->vmfd >= 0)
                error |= close(kd->vmfd);
        if (kd->nlfd >= 0)
                error |= close(kd->nlfd);
        if (kd->vmst)
                _kvm_freevtop(kd);
        if (kd->procbase != 0)
                free((void *)kd->procbase);
        if (kd->argv != 0)
                free((void *)kd->argv);
        free((void *)kd);

        return (0);
}

Код: Выделить всё

"Alexander V. Chernikov" <admin@su29.net> 
кому	        666.root@gmail.com	 
дата		23.02.2008 17:26	 
тема		Re: i386/120872: fstat exit on signall 11	
 
The following patch fixes an issue on i386/amd64 platforms

kvm_checkheader is a simple cut-n-paste from imgact_elf.c check_header

diff -urN lib/libkvm.orig/kvm.c lib/libkvm/kvm.c
--- lib/libkvm.orig/kvm.c       2008-02-23 17:48:27.000000000 +0300
+++ lib/libkvm/kvm.c    2008-02-23 17:48:33.000000000 +0300
@@ -64,6 +64,8 @@
 #include <string.h>
 #include <unistd.h>

+#include <machine/elf.h>
+
 #include "kvm_private.h"

 /* from src/lib/libc/gen/nlist.c */
@@ -136,6 +138,21 @@
       return (p);
 }

+int
+_kvm_checkheader(void *e)
+{
+       Elf_Ehdr *hdr = e;
+       if (!IS_ELF(*hdr) ||
+           hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
+           hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
+           hdr->e_ident[EI_VERSION] != EV_CURRENT ||
+           hdr->e_phentsize != sizeof(Elf_Phdr) ||
+           hdr->e_version != ELF_TARG_VER ||
+           hdr->e_machine > MAX_BRANDS)
+               return (ENOEXEC);
+return (0);
+}
+
 static kvm_t *
 _kvm_open(kd, uf, mf, flag, errout)
       kvm_t *kd;
diff -urN lib/libkvm.orig/kvm_amd64.c lib/libkvm/kvm_amd64.c
--- lib/libkvm.orig/kvm_amd64.c 2008-02-23 17:48:27.000000000 +0300
+++ lib/libkvm/kvm_amd64.c      2008-02-23 17:51:27.000000000 +0300
@@ -170,6 +170,11 @@
                       return (-1);

               ehdr = kd->vmst->mmapbase;
+               if (_kvm_checkheader(ehdr) != 0) {
+                       _kvm_err(kd, kd->program, "core is not valid ELF core");
+                       return (-1);
+               }
+
               hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
               if (_kvm_maphdrs(kd, hdrsz) == -1)
                       return (-1);
diff -urN lib/libkvm.orig/kvm_i386.c lib/libkvm/kvm_i386.c
--- lib/libkvm.orig/kvm_i386.c  2008-02-23 17:51:03.000000000 +0300
+++ lib/libkvm/kvm_i386.c       2008-02-23 17:51:14.000000000 +0300
@@ -177,6 +177,11 @@
                       return (-1);

               ehdr = kd->vmst->mmapbase;
+               if (_kvm_checkheader(ehdr) != 0) {
+                       _kvm_err(kd, kd->program, "core is not valid ELF core");
+                       return (-1);
+               }
+
               hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
               if (_kvm_maphdrs(kd, hdrsz) == -1)
                       return (-1);
diff -urN lib/libkvm.orig/kvm_private.h lib/libkvm/kvm_private.h
--- lib/libkvm.orig/kvm_private.h       2008-02-23 17:48:28.000000000 +0300
+++ lib/libkvm/kvm_private.h    2008-02-23 17:48:33.000000000 +0300
@@ -79,6 +79,9 @@
           __printflike(3, 4);
 int     _kvm_uvatop(kvm_t *, const struct proc *, u_long, u_long *);

+#define MAX_BRANDS     8 /* from sys/imgact_elf.h */
+int     _kvm_checkheader(void *);
+
 #if defined(__amd64__) || defined(__i386__)
 void    _kvm_minidump_freevtop(kvm_t *);
 int     _kvm_minidump_initvtop(kvm_t *);