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lib: sbi_scratch: zero out scratch memory on all harts

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In sbi_scratch_init() we determine the last hart. The index of the last
hart cannot exceed SBI_HARTMASK_MAX_BITS - 1. We should not initialize
last_hartid_having_scratch to a higher number to avoid buffer overflows
when using this value before calling sbi_scratch_init().

When allocating scratch memory in sbi_scratch_alloc_offset() we zero out
the allocated memory for all harts except for the last one. We should not
skip the last hart.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Heinrich Schuchardt 2021-06-05 14:22:43 +02:00 • committed by Anup Patel
parent 434198e3be
commit 1da3d80b5b
1 changed files with 2 additions and 2 deletions
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4
lib/sbi/sbi_scratch.c
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@ -14,7 +14,7 @@
#include <sbi/sbi_scratch.h> #include <sbi/sbi_scratch.h>
#include <sbi/sbi_string.h> #include <sbi/sbi_string.h>
u32 last_hartid_having_scratch = SBI_HARTMASK_MAX_BITS; u32 last_hartid_having_scratch = SBI_HARTMASK_MAX_BITS - 1;
struct sbi_scratch *hartid_to_scratch_table[SBI_HARTMASK_MAX_BITS] = { 0 }; struct sbi_scratch *hartid_to_scratch_table[SBI_HARTMASK_MAX_BITS] = { 0 };
static spinlock_t extra_lock = SPIN_LOCK_INITIALIZER; static spinlock_t extra_lock = SPIN_LOCK_INITIALIZER;
@ -74,7 +74,7 @@ done:
spin_unlock(&extra_lock); spin_unlock(&extra_lock);
if (ret) { if (ret) {
for (i = 0; i < sbi_scratch_last_hartid(); i++) { for (i = 0; i <= sbi_scratch_last_hartid(); i++) {
rscratch = sbi_hartid_to_scratch(i); rscratch = sbi_hartid_to_scratch(i);
if (!rscratch) if (!rscratch)
continue; continue;