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Clarify a bit why a particular magic number was chosen

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jvoisin 2023-11-16 17:49:11 +01:00 committed by Daniel Micay
parent 3c274731ba
commit 61821b02c8
1 changed files with 2 additions and 1 deletions
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h_malloc.c
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@ -495,7 +495,8 @@ static void set_slab_canary_value(UNUSED struct slab_metadata *metadata, UNUSED
// When MTE is enabled, writing and reading of canaries is disabled, i.e. canary remains zeroed. // When MTE is enabled, writing and reading of canaries is disabled, i.e. canary remains zeroed.
// After MTE is disabled, canaries that are set to 0 are ignored, since they wouldn't match // After MTE is disabled, canaries that are set to 0 are ignored, since they wouldn't match
// slab's metadata->canary_value. // slab's metadata->canary_value.
metadata->canary_value = 0x100; // 0x100 was chosen as the smallest acceptable value // 0x100 was chosen arbitrarily, and can be encoded as an immediate value on ARM by the compiler.
metadata->canary_value = 0x100;
} }
#endif #endif
#endif #endif