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pread/pwrite syscalls - use page_unprotect_range() in vital cases to avoid problems if the kernel writes data in protected page (needed for self-modifying code support)

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@164 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-05-14 19:01:56 +00:00
parent fd6ce8f660
commit 206f0fa759
1 changed files with 6 additions and 2 deletions
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8
linux-user/syscall.c
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@ -1137,6 +1137,7 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
ret = 0; /* avoid warning */
break;
case TARGET_NR_read:
page_unprotect_range((void *)arg2, arg3);
ret = get_errno(read(arg1, (void *)arg2, arg3));
break;
case TARGET_NR_write:
@ -2191,9 +2192,12 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
case TARGET_NR_prctl:
goto unimplemented;
case TARGET_NR_pread:
goto unimplemented;
page_unprotect_range((void *)arg2, arg3);
ret = get_errno(pread(arg1, (void *)arg2, arg3, arg4));
break;
case TARGET_NR_pwrite:
goto unimplemented;
ret = get_errno(pwrite(arg1, (void *)arg2, arg3, arg4));
break;
case TARGET_NR_chown:
ret = get_errno(chown((const char *)arg1, arg2, arg3));
break;