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authorKees Cook <keescook@chromium.org>2017-03-05 00:56:38 -0800
committerKees Cook <keescook@chromium.org>2017-03-07 14:01:01 -0800
commitfdd0311863b32b42bb2c54e60c987bbbabc0c430 (patch)
treedb38dec895d060edecc9921db07bf71f961fb860 /fs/pstore
parentb10b471145f28c219d9ddcc309a67e053776865a (diff)
downloadlinux-fdd0311863b32b42bb2c54e60c987bbbabc0c430.tar.bz2
pstore: Replace arguments for write_buf_user() API
Removes argument list in favor of pstore record, though the user buffer remains passed separately since it must carry the __user annotation. Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'fs/pstore')
-rw-r--r--fs/pstore/platform.c35
-rw-r--r--fs/pstore/pmsg.c9
-rw-r--r--fs/pstore/ram.c14
3 files changed, 23 insertions, 35 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 5eecf9012459..1e6642a2063e 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -639,47 +639,36 @@ static int pstore_write_compat(struct pstore_record *record)
return record->psi->write_buf(record);
}
-static int pstore_write_buf_user_compat(enum pstore_type_id type,
- enum kmsg_dump_reason reason,
- u64 *id, unsigned int part,
- const char __user *buf,
- bool compressed, size_t size,
- struct pstore_info *psi)
+static int pstore_write_buf_user_compat(struct pstore_record *record,
+ const char __user *buf)
{
unsigned long flags = 0;
- size_t i, bufsize = size;
+ size_t i, bufsize, total_size = record->size;
long ret = 0;
- if (unlikely(!access_ok(VERIFY_READ, buf, size)))
+ if (unlikely(!access_ok(VERIFY_READ, buf, total_size)))
return -EFAULT;
+ bufsize = total_size;
if (bufsize > psinfo->bufsize)
bufsize = psinfo->bufsize;
+ record->buf = psinfo->buf;
spin_lock_irqsave(&psinfo->buf_lock, flags);
- for (i = 0; i < size; ) {
- struct pstore_record record = {
- .type = type,
- .reason = reason,
- .id = id,
- .part = part,
- .buf = psinfo->buf,
- .compressed = compressed,
- .psi = psi,
- };
- size_t c = min(size - i, bufsize);
+ for (i = 0; i < total_size; ) {
+ size_t c = min(total_size - i, bufsize);
- ret = __copy_from_user(psinfo->buf, buf + i, c);
+ ret = __copy_from_user(record->buf, buf + i, c);
if (unlikely(ret != 0)) {
ret = -EFAULT;
break;
}
- record.size = c;
- ret = psi->write_buf(&record);
+ record->size = c;
+ ret = record->psi->write_buf(record);
if (unlikely(ret < 0))
break;
i += c;
}
spin_unlock_irqrestore(&psinfo->buf_lock, flags);
- return unlikely(ret < 0) ? ret : size;
+ return unlikely(ret < 0) ? ret : total_size;
}
/*
diff --git a/fs/pstore/pmsg.c b/fs/pstore/pmsg.c
index 78f6176c020f..ce35907602de 100644
--- a/fs/pstore/pmsg.c
+++ b/fs/pstore/pmsg.c
@@ -23,7 +23,11 @@ static DEFINE_MUTEX(pmsg_lock);
static ssize_t write_pmsg(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- u64 id;
+ struct pstore_record record = {
+ .type = PSTORE_TYPE_PMSG,
+ .size = count,
+ .psi = psinfo,
+ };
int ret;
if (!count)
@@ -34,8 +38,7 @@ static ssize_t write_pmsg(struct file *file, const char __user *buf,
return -EFAULT;
mutex_lock(&pmsg_lock);
- ret = psinfo->write_buf_user(PSTORE_TYPE_PMSG, 0, &id, 0, buf, 0, count,
- psinfo);
+ ret = psinfo->write_buf_user(&record, buf);
mutex_unlock(&pmsg_lock);
return ret ? ret : count;
}
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index a7cdde60b1f9..d85e1adae1b6 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -451,19 +451,15 @@ static int notrace ramoops_pstore_write_buf(struct pstore_record *record)
return 0;
}
-static int notrace ramoops_pstore_write_buf_user(enum pstore_type_id type,
- enum kmsg_dump_reason reason,
- u64 *id, unsigned int part,
- const char __user *buf,
- bool compressed, size_t size,
- struct pstore_info *psi)
+static int notrace ramoops_pstore_write_buf_user(struct pstore_record *record,
+ const char __user *buf)
{
- if (type == PSTORE_TYPE_PMSG) {
- struct ramoops_context *cxt = psi->data;
+ if (record->type == PSTORE_TYPE_PMSG) {
+ struct ramoops_context *cxt = record->psi->data;
if (!cxt->mprz)
return -ENOMEM;
- return persistent_ram_write_user(cxt->mprz, buf, size);
+ return persistent_ram_write_user(cxt->mprz, buf, record->size);
}
return -EINVAL;