X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fi386%2Fkernel%2Fcpu%2Fmtrr%2Fif.c;h=590d99e93af7e10a840596987e013d5144971f0b;hb=refs%2Fheads%2Fvserver;hp=c6355055708a1bb30b8084c254cb2e3da0494323;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git diff --git a/arch/i386/kernel/cpu/mtrr/if.c b/arch/i386/kernel/cpu/mtrr/if.c index c63550557..590d99e93 100644 --- a/arch/i386/kernel/cpu/mtrr/if.c +++ b/arch/i386/kernel/cpu/mtrr/if.c @@ -1,5 +1,6 @@ #include #include +#include #include #include #include @@ -16,7 +17,7 @@ extern unsigned int *usage_table; #define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private) -static char *mtrr_strings[MTRR_NUM_TYPES] = +static const char *const mtrr_strings[MTRR_NUM_TYPES] = { "uncachable", /* 0 */ "write-combining", /* 1 */ @@ -27,7 +28,7 @@ static char *mtrr_strings[MTRR_NUM_TYPES] = "write-back", /* 6 */ }; -char *mtrr_attrib_to_str(int x) +const char *mtrr_attrib_to_str(int x) { return (x <= 6) ? mtrr_strings[x] : "?"; } @@ -43,10 +44,9 @@ mtrr_file_add(unsigned long base, unsigned long size, max = num_var_ranges; if (fcount == NULL) { - fcount = kmalloc(max * sizeof *fcount, GFP_KERNEL); + fcount = kzalloc(max * sizeof *fcount, GFP_KERNEL); if (!fcount) return -ENOMEM; - memset(fcount, 0, max * sizeof *fcount); FILE_FCOUNT(file) = fcount; } if (!page) { @@ -98,19 +98,20 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos) unsigned long long base, size; char *ptr; char line[LINE_SIZE]; + size_t linelen; if (!capable(CAP_SYS_ADMIN)) return -EPERM; - /* Can't seek (pwrite) on this device */ - if (ppos != &file->f_pos) - return -ESPIPE; + if (!len) + return -EINVAL; memset(line, 0, LINE_SIZE); if (len > LINE_SIZE) len = LINE_SIZE; if (copy_from_user(line, buf, len - 1)) return -EFAULT; - ptr = line + strlen(line) - 1; - if (*ptr == '\n') + linelen = strlen(line); + ptr = line + linelen - 1; + if (linelen && *ptr == '\n') *ptr = '\0'; if (!strncmp(line, "disable=", 8)) { reg = simple_strtoul(line + 8, &ptr, 0); @@ -148,128 +149,172 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos) return -EINVAL; } -static int -mtrr_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long __arg) +static long +mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg) { - int err; + int err = 0; mtrr_type type; + unsigned long size; struct mtrr_sentry sentry; struct mtrr_gentry gentry; void __user *arg = (void __user *) __arg; + unsigned int compat_cmd = cmd; + + switch (compat_cmd) { + case MTRRIOC_ADD_ENTRY: + case MTRRIOC_SET_ENTRY: + case MTRRIOC_DEL_ENTRY: + case MTRRIOC_KILL_ENTRY: + case MTRRIOC_ADD_PAGE_ENTRY: + case MTRRIOC_SET_PAGE_ENTRY: + case MTRRIOC_DEL_PAGE_ENTRY: + case MTRRIOC_KILL_PAGE_ENTRY: + if (copy_from_user(&sentry, arg, sizeof sentry)) + return -EFAULT; + break; + case MTRRIOC_GET_ENTRY: + case MTRRIOC_GET_PAGE_ENTRY: + if (copy_from_user(&gentry, arg, sizeof gentry)) + return -EFAULT; + break; +#ifdef CONFIG_COMPAT +#define MTRR_COMPAT_OP(op, type)\ + case MTRRIOC32_##op: \ + cmd = MTRRIOC_##op; \ + goto compat_get_##type + + MTRR_COMPAT_OP(ADD_ENTRY, sentry); + MTRR_COMPAT_OP(SET_ENTRY, sentry); + MTRR_COMPAT_OP(DEL_ENTRY, sentry); + MTRR_COMPAT_OP(KILL_ENTRY, sentry); + MTRR_COMPAT_OP(ADD_PAGE_ENTRY, sentry); + MTRR_COMPAT_OP(SET_PAGE_ENTRY, sentry); + MTRR_COMPAT_OP(DEL_PAGE_ENTRY, sentry); + MTRR_COMPAT_OP(KILL_PAGE_ENTRY, sentry); +compat_get_sentry: { + struct mtrr_sentry32 __user *s32 = (struct mtrr_sentry32 __user *)__arg; + err = get_user(sentry.base, &s32->base); + err |= get_user(sentry.size, &s32->size); + err |= get_user(sentry.type, &s32->type); + if (err) + return err; + break; + } + MTRR_COMPAT_OP(GET_ENTRY, gentry); + MTRR_COMPAT_OP(GET_PAGE_ENTRY, gentry); +compat_get_gentry: { + struct mtrr_gentry32 __user *g32 = (struct mtrr_gentry32 __user *)__arg; + err = get_user(gentry.regnum, &g32->regnum); + err |= get_user(gentry.base, &g32->base); + err |= get_user(gentry.size, &g32->size); + err |= get_user(gentry.type, &g32->type); + if (err) + return err; + break; + } +#undef MTRR_COMPAT_OP +#endif + } switch (cmd) { default: - return -ENOIOCTLCMD; + return -ENOTTY; case MTRRIOC_ADD_ENTRY: if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (copy_from_user(&sentry, arg, sizeof sentry)) - return -EFAULT; err = mtrr_file_add(sentry.base, sentry.size, sentry.type, 1, file, 0); - if (err < 0) - return err; break; case MTRRIOC_SET_ENTRY: if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (copy_from_user(&sentry, arg, sizeof sentry)) - return -EFAULT; err = mtrr_add(sentry.base, sentry.size, sentry.type, 0); - if (err < 0) - return err; break; case MTRRIOC_DEL_ENTRY: if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (copy_from_user(&sentry, arg, sizeof sentry)) - return -EFAULT; err = mtrr_file_del(sentry.base, sentry.size, file, 0); - if (err < 0) - return err; break; case MTRRIOC_KILL_ENTRY: if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (copy_from_user(&sentry, arg, sizeof sentry)) - return -EFAULT; err = mtrr_del(-1, sentry.base, sentry.size); - if (err < 0) - return err; break; case MTRRIOC_GET_ENTRY: - if (copy_from_user(&gentry, arg, sizeof gentry)) - return -EFAULT; if (gentry.regnum >= num_var_ranges) return -EINVAL; - mtrr_if->get(gentry.regnum, &gentry.base, &gentry.size, &type); + mtrr_if->get(gentry.regnum, &gentry.base, &size, &type); /* Hide entries that go above 4GB */ - if (gentry.base + gentry.size > 0x100000 - || gentry.size == 0x100000) + if (gentry.base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT)) + || size >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))) gentry.base = gentry.size = gentry.type = 0; else { gentry.base <<= PAGE_SHIFT; - gentry.size <<= PAGE_SHIFT; + gentry.size = size << PAGE_SHIFT; gentry.type = type; } - if (copy_to_user(arg, &gentry, sizeof gentry)) - return -EFAULT; break; case MTRRIOC_ADD_PAGE_ENTRY: if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (copy_from_user(&sentry, arg, sizeof sentry)) - return -EFAULT; err = mtrr_file_add(sentry.base, sentry.size, sentry.type, 1, file, 1); - if (err < 0) - return err; break; case MTRRIOC_SET_PAGE_ENTRY: if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (copy_from_user(&sentry, arg, sizeof sentry)) - return -EFAULT; err = mtrr_add_page(sentry.base, sentry.size, sentry.type, 0); - if (err < 0) - return err; break; case MTRRIOC_DEL_PAGE_ENTRY: if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (copy_from_user(&sentry, arg, sizeof sentry)) - return -EFAULT; err = mtrr_file_del(sentry.base, sentry.size, file, 1); - if (err < 0) - return err; break; case MTRRIOC_KILL_PAGE_ENTRY: if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (copy_from_user(&sentry, arg, sizeof sentry)) - return -EFAULT; err = mtrr_del_page(-1, sentry.base, sentry.size); - if (err < 0) - return err; break; case MTRRIOC_GET_PAGE_ENTRY: - if (copy_from_user(&gentry, arg, sizeof gentry)) - return -EFAULT; if (gentry.regnum >= num_var_ranges) return -EINVAL; - mtrr_if->get(gentry.regnum, &gentry.base, &gentry.size, &type); - gentry.type = type; + mtrr_if->get(gentry.regnum, &gentry.base, &size, &type); + /* Hide entries that would overflow */ + if (size != (__typeof__(gentry.size))size) + gentry.base = gentry.size = gentry.type = 0; + else { + gentry.size = size; + gentry.type = type; + } + break; + } + + if (err) + return err; + switch(compat_cmd) { + case MTRRIOC_GET_ENTRY: + case MTRRIOC_GET_PAGE_ENTRY: if (copy_to_user(arg, &gentry, sizeof gentry)) - return -EFAULT; + err = -EFAULT; + break; +#ifdef CONFIG_COMPAT + case MTRRIOC32_GET_ENTRY: + case MTRRIOC32_GET_PAGE_ENTRY: { + struct mtrr_gentry32 __user *g32 = (struct mtrr_gentry32 __user *)__arg; + err = put_user(gentry.base, &g32->base); + err |= put_user(gentry.size, &g32->size); + err |= put_user(gentry.regnum, &g32->regnum); + err |= put_user(gentry.type, &g32->type); break; } - return 0; +#endif + } + return err; } static int @@ -309,7 +354,8 @@ static struct file_operations mtrr_fops = { .read = seq_read, .llseek = seq_lseek, .write = mtrr_write, - .ioctl = mtrr_ioctl, + .unlocked_ioctl = mtrr_ioctl, + .compat_ioctl = mtrr_ioctl, .release = mtrr_close, }; @@ -322,8 +368,7 @@ static int mtrr_seq_show(struct seq_file *seq, void *offset) char factor; int i, max, len; mtrr_type type; - unsigned long base; - unsigned int size; + unsigned long base, size; len = 0; max = num_var_ranges; @@ -342,7 +387,7 @@ static int mtrr_seq_show(struct seq_file *seq, void *offset) } /* RED-PEN: base can be > 32bit */ len += seq_printf(seq, - "reg%02i: base=0x%05lx000 (%4liMB), size=%4i%cB: %s, count=%d\n", + "reg%02i: base=0x%05lx000 (%4luMB), size=%4lu%cB: %s, count=%d\n", i, base, base >> (20 - PAGE_SHIFT), size, factor, mtrr_attrib_to_str(type), usage_table[i]); }