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Viewing changes to syscalls/mprotect.c

  • Committer: Package Import Robot
  • Author(s): gustavo panizzo
  • Date: 2014-01-17 21:10:15 UTC
  • mfrom: (1.1.1)
  • Revision ID: package-import@ubuntu.com-20140117211015-k2qbnpu0osa5mlil
Tags: 1.3-1
http://bugs.debian.org/733771
* New upstream version 1.3.
* Removed wrong dependency on linux-headers. (Closes: #733771).

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syscalls/mprotect.c
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 * sys_mprotect(unsigned long start, size_t len, unsigned long prot)
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 */
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#include <asm/mman.h>
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#include "trinity.h"    // page_size
 
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#include "utils.h"      // page_size
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#include "arch.h"
 
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#include "maps.h"
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#include "random.h"
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#include "sanitise.h"
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#include "shm.h"
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static void sanitise_mprotect(int childno)
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{
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        unsigned long end;
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        shm->a1[childno] &= PAGE_MASK;
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retry_end:
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        end = shm->a1[childno] + shm->a2[childno];
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        /* Length must not be zero. */
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        if (shm->a2[childno] == 0) {
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                shm->a2[childno] = rand64();
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                goto retry_end;
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        }
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        /* End must be after start */
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        if (end <= shm->a1[childno]) {
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                shm->a2[childno] = rand64();
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                goto retry_end;
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        }
 
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        (void) common_set_mmap_ptr_len(childno);
 
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}
 
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/*
 
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 * If we successfully did an mprotect, update our record of the mappings prot bits.
 
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 */
 
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static void post_mprotect(int childno)
 
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{
 
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        struct map *map = (struct map *) shm->scratch[childno];
 
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        if (shm->retval[childno] != 0)
 
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                map->prot = shm->a3[childno];
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}
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struct syscall syscall_mprotect = {
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        .name = "mprotect",
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        .num_args = 3,
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        .arg1name = "start",
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        .arg1type = ARG_ADDRESS,
 
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        .arg1type = ARG_MMAP,
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        .arg2name = "len",
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        .arg2type = ARG_LEN,
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        .arg3name = "prot",
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        .arg3type = ARG_LIST,
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        .arg3list = {
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        },
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        .sanitise = sanitise_mprotect,
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        .group = GROUP_VM,
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        .flags = AVOID_SYSCALL, // hopefully temporary.
 
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        .post = post_mprotect,
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};