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lib: sbi: Add the bound check for events during config match

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Currently, there is no sanity check for firmware event code. We don't see
any issue as Linux kernel driver does a bound check on firmware events
already. However, OpenSBI can't assume sane supervisor mode software
always. Thus, an invalid event idx can cause a buffer overflow error.
For hardware events, the match will fail for invalid event code anyways.
However, a search is unecessary if event code is invalid.

Add a event ID validation function to solve the issue.

Signed-off-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Atish Patra
2022-07-20 14:50:33 -07:00
committed by Anup Patel
parent 1545afd342
commit 83db3af5f9
2 changed files with 55 additions and 2 deletions
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6
include/sbi/sbi_ecall_interface.h
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@@ -208,6 +208,12 @@ enum sbi_pmu_ctr_type {
#define SBI_PMU_EVENT_IDX_INVALID 0xFFFFFFFF
#define SBI_PMU_EVENT_HW_CACHE_OPS_RESULT 0x1
#define SBI_PMU_EVENT_HW_CACHE_OPS_ID_MASK 0x6
#define SBI_PMU_EVENT_HW_CACHE_OPS_ID_OFFSET 1
#define SBI_PMU_EVENT_HW_CACHE_ID_MASK 0xfff8
#define SBI_PMU_EVENT_HW_CACHE_ID_OFFSET 3
/* Flags defined for config matching function */
#define SBI_PMU_CFG_FLAG_SKIP_MATCH (1 << 0)
#define SBI_PMU_CFG_FLAG_CLEAR_VALUE (1 << 1)