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hw/intc/arm_gicv3_its: Fix event ID bounds checks 

In process_its_cmd() and process_mapti() we must check the
event ID against a limit defined by the size field in the DTE,
which specifies the number of ID bits minus one. Convert
this code to our num_foo convention:
 * change the variable names
 * use uint64_t and 1ULL when calculating the number
   of valid event IDs, because DTE.SIZE is 5 bits and
   so num_eventids may be up to 2^32
 * fix the off-by-one error in the comparison

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20220111171048.3545974-2-peter.maydell@linaro.org
master
Peter Maydell 2022-01-11 17:10:36 +00:00
parent 3222165dcb
commit 8f809f6992
1 changed files with 10 additions and 8 deletions
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18
hw/intc/arm_gicv3_its.c
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@ -225,7 +225,7 @@ static bool process_its_cmd(GICv3ITSState *s, uint64_t value, uint32_t offset,
MemTxResult res = MEMTX_OK;
bool dte_valid;
uint64_t dte = 0;
uint32_t max_eventid;
uint64_t num_eventids;
uint16_t icid = 0;
uint32_t pIntid = 0;
bool ite_valid = false;
@ -258,7 +258,7 @@ static bool process_its_cmd(GICv3ITSState *s, uint64_t value, uint32_t offset,
dte_valid = FIELD_EX64(dte, DTE, VALID);
if (dte_valid) {
max_eventid = 1UL << (FIELD_EX64(dte, DTE, SIZE) + 1);
num_eventids = 1ULL << (FIELD_EX64(dte, DTE, SIZE) + 1);
ite_valid = get_ite(s, eventid, dte, &icid, &pIntid, &res);
@ -299,10 +299,11 @@ static bool process_its_cmd(GICv3ITSState *s, uint64_t value, uint32_t offset,
dte_valid ? "valid" : "invalid",
ite_valid ? "valid" : "invalid",
cte_valid ? "valid" : "invalid");
} else if (eventid > max_eventid) {
} else if (eventid >= num_eventids) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: invalid command attributes: eventid %d > %d\n",
__func__, eventid, max_eventid);
"%s: invalid command attributes: eventid %d >= %"
PRId64 "\n",
__func__, eventid, num_eventids);
} else {
/*
* Current implementation only supports rdbase == procnum
@ -336,7 +337,8 @@ static bool process_mapti(GICv3ITSState *s, uint64_t value, uint32_t offset,
AddressSpace *as = &s->gicv3->dma_as;
uint32_t devid, eventid;
uint32_t pIntid = 0;
uint32_t max_eventid, max_Intid;
uint64_t num_eventids;
uint32_t max_Intid;
bool dte_valid;
MemTxResult res = MEMTX_OK;
uint16_t icid = 0;
@ -376,11 +378,11 @@ static bool process_mapti(GICv3ITSState *s, uint64_t value, uint32_t offset,
return result;
}
dte_valid = FIELD_EX64(dte, DTE, VALID);
max_eventid = 1UL << (FIELD_EX64(dte, DTE, SIZE) + 1);
num_eventids = 1ULL << (FIELD_EX64(dte, DTE, SIZE) + 1);
max_Intid = (1ULL << (GICD_TYPER_IDBITS + 1)) - 1;
if ((devid >= s->dt.num_ids) || (icid >= s->ct.num_ids)
|| !dte_valid || (eventid > max_eventid) ||
|| !dte_valid || (eventid >= num_eventids) ||
(((pIntid < GICV3_LPI_INTID_START) || (pIntid > max_Intid)) &&
(pIntid != INTID_SPURIOUS))) {
qemu_log_mask(LOG_GUEST_ERROR,