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kernel: add safememset() kernel call

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This commit is contained in:
Arne Welzel
2012-09-22 20:01:05 +00:00
committed by Ben Gras
parent 0617743bd1
commit d8a89dcbe6
5 changed files with 75 additions and 2 deletions
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3
kernel/system.c
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@@ -226,6 +226,9 @@ void system_init(void)
map(SYS_SAFECOPYTO, do_safecopy_to); /* copy with pre-granted permission */
map(SYS_VSAFECOPY, do_vsafecopy); /* vectored safecopy */
/* safe memset */
map(SYS_SAFEMEMSET, do_safememset); /* safememset */
/* Mapping. */
map(SYS_SAFEMAP, do_safemap); /* map pages from other process */
map(SYS_SAFEREVMAP, do_saferevmap); /* grantor revokes the map grant */

2
kernel/system.h
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@@ -178,6 +178,8 @@ int do_vmctl(struct proc * caller, message *m_ptr);
int do_setgrant(struct proc * caller, message *m_ptr);
int do_readbios(struct proc * caller, message *m_ptr);
int do_safememset(struct proc * caller, message *m_ptr);
int do_safemap(struct proc * caller, message *m_ptr);
int do_saferevmap(struct proc * caller, message *m_ptr);
int do_safeunmap(struct proc * caller, message *m_ptr);

1
kernel/system/Makefile.inc
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@@ -25,6 +25,7 @@ SRCS+= \
do_setgrant.c \
do_privctl.c \
do_safecopy.c \
do_safememset.c \
do_safemap.c \
do_sysctl.c \
do_getksig.c \

58
kernel/system/do_safememset.c Normal file
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@@ -0,0 +1,58 @@
/* The kernel call implemented in this file:
* m_type: SYS_SAFEMEMSET
*
* The parameters for this kernel call are:
* SMS_DST dst endpoint
* SMS_GID grant id
* SMS_OFFSET offset within grant
* SMS_PATTERN memset pattern byte
* SMS_BYTES bytes from offset
*/
#include <assert.h>
#include <minix/safecopies.h>
#include "kernel/system.h"
#include "kernel.h"
/*===========================================================================*
* do_safememset *
*===========================================================================*/
int do_safememset(struct proc *caller, message *m_ptr) {
/* Implementation of the do_safememset() kernel call */
/* Extract parameters */
endpoint_t dst_endpt = m_ptr->SMS_DST;
endpoint_t caller_endpt = caller->p_endpoint;
cp_grant_id_t grantid = m_ptr->SMS_GID;
vir_bytes g_offset = m_ptr->SMS_OFFSET;
int pattern = m_ptr->SMS_PATTERN;
size_t len = (size_t)m_ptr->SMS_BYTES;
struct proc *dst_p;
endpoint_t new_granter;
static vir_bytes v_offset;
int r;
if (dst_endpt == NONE || caller_endpt == NONE)
return EFAULT;
if (!(dst_p = endpoint_lookup(dst_endpt)))
return EINVAL;
if (!(priv(dst_p) && priv(dst_p)->s_grant_table)) {
printf("safememset: dst %d has no grant table\n", dst_endpt);
return EINVAL;
}
/* Verify permission exists, memset always requires CPF_WRITE */
r = verify_grant(dst_endpt, caller_endpt, grantid, len, CPF_WRITE,
g_offset, &v_offset, &new_granter);
if (r != OK) {
printf("safememset: grant %d verify failed %d", grantid, r);
return r;
}
return vm_memset(caller, new_granter, v_offset, pattern, len);
}