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drivers/gicv3: fix potential GICD context override with ESPI enabled 

RESTORE/SAVE_GICD_EREGS uses (int_id - (MIN_ESPI_ID - MIN_SPI_ID)) to
get the context array index for ESPI, which will override the space of
standard SPI starting from (MIN_SPI_ID + MIN_SPI_ID).

However, using TOTAL_SPI_INTR_NUM to replace the above MIN_SPI_ID
cannot totally fix the issue, for TOTAL_SPI_INTR_NUM is not well
aligned and the array index will be rounded down by the shifting
operation if being shifted more than 2 bits. It will cause buffer
override again when the existing maximum SPI reaches 1019.

So round up TOTAL_SPI_INTR_NUM with (1 << REG##R_SHIFT) for GICD
context arrays.

Signed-off-by: Heyi Guo <guoheyi@linux.alibaba.com>
Change-Id: I5be2837c42f381a62f8d46a4ecd778009b1fe059
This commit is contained in:
Heyi Guo 2021-01-14 22:16:18 +08:00 committed by Manish Pandey
parent 60cd8030bf
commit deb18901d1
1 changed files with 4 additions and 2 deletions
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6
drivers/arm/gic/v3/gicv3_main.c
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@ -70,7 +70,8 @@ static bool is_sgi_ppi(unsigned int id);
for (unsigned int int_id = MIN_ESPI_ID; int_id < (intr_num);\
int_id += (1U << REG##R_SHIFT)) { \
gicd_write_##reg((base), int_id, \
(ctx)->gicd_##reg[(int_id - (MIN_ESPI_ID - MIN_SPI_ID))\
(ctx)->gicd_##reg[(int_id - (MIN_ESPI_ID - \
round_up(TOTAL_SPI_INTR_NUM, 1U << REG##R_SHIFT)))\
>> REG##R_SHIFT]); \
} \
} while (false)
@ -79,7 +80,8 @@ static bool is_sgi_ppi(unsigned int id);
do { \
for (unsigned int int_id = MIN_ESPI_ID; int_id < (intr_num);\
int_id += (1U << REG##R_SHIFT)) { \
(ctx)->gicd_##reg[(int_id - (MIN_ESPI_ID - MIN_SPI_ID))\
(ctx)->gicd_##reg[(int_id - (MIN_ESPI_ID - \
round_up(TOTAL_SPI_INTR_NUM, 1U << REG##R_SHIFT)))\
>> REG##R_SHIFT] = gicd_read_##reg((base), int_id);\
} \
} while (false)