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coverity-model: update address_space_read/write models 

Use void * for consistency with the actual function; provide a model
for MemoryRegionCache functions and for address_space_rw.  These
let Coverity understand the bounds of the data that various functions
read and write even at very high levels of inlining (e.g. pci_dma_read).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-07-27 17:50:09 +02:00
parent e4383ca240
commit d4b3d152ee
1 changed files with 45 additions and 3 deletions
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48
scripts/coverity-scan/model.c
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@ -45,9 +45,10 @@ typedef struct va_list_str *va_list;
/* exec.c */
typedef struct AddressSpace AddressSpace;
typedef struct MemoryRegionCache MemoryRegionCache;
typedef uint64_t hwaddr;
typedef uint32_t MemTxResult;
typedef uint64_t MemTxAttrs;
typedef struct MemTxAttrs {} MemTxAttrs;
static void __bufwrite(uint8_t *buf, ssize_t len)
{
@ -67,9 +68,40 @@ static void __bufread(uint8_t *buf, ssize_t len)
int last = buf[len-1];
}
MemTxResult address_space_read_cached(MemoryRegionCache *cache, hwaddr addr,
MemTxAttrs attrs,
void *buf, int len)
{
MemTxResult result;
// TODO: investigate impact of treating reads as producing
// tainted data, with __coverity_tainted_data_argument__(buf).
__bufwrite(buf, len);
return result;
}
MemTxResult address_space_write_cached(MemoryRegionCache *cache, hwaddr addr,
MemTxAttrs attrs,
const void *buf, int len)
{
MemTxResult result;
__bufread(buf, len);
return result;
}
MemTxResult address_space_rw_cached(MemoryRegionCache *cache, hwaddr addr,
MemTxAttrs attrs,
void *buf, int len, bool is_write)
{
if (is_write) {
return address_space_write_cached(cache, addr, attrs, buf, len);
} else {
return address_space_read_cached(cache, addr, attrs, buf, len);
}
}
MemTxResult address_space_read(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs,
uint8_t *buf, int len)
void *buf, int len)
{
MemTxResult result;
// TODO: investigate impact of treating reads as producing
@ -80,13 +112,23 @@ MemTxResult address_space_read(AddressSpace *as, hwaddr addr,
MemTxResult address_space_write(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs,
const uint8_t *buf, int len)
const void *buf, int len)
{
MemTxResult result;
__bufread(buf, len);
return result;
}
MemTxResult address_space_rw(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs,
void *buf, int len, bool is_write)
{
if (is_write) {
return address_space_write(as, addr, attrs, buf, len);
} else {
return address_space_read(as, addr, attrs, buf, len);
}
}
/* Tainting */