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The page pool is carved out of the PSRAM that user processes run from, and the external memory permissions are indexed by physical address, so a permanent kernel window onto the pool is a window onto every process, which no permission setting can close. Stop mapping the pool. The kernel reaches a pool page through a small scratch region instead, mapped for one operation and invalidated afterwards. esp32s3_pgmap() takes a slot, esp32s3_pgunmap() releases it, and ARCH_KMAP_VBASE and ARCH_KMAP_NPAGES describe the region. Two slots are enough, because the deepest user is up_addrenv_fork(), which holds a source and a destination page at once. Assisted-by: Claude Opus 5 (1M context) <noreply@anthropic.com> Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com> |
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| arm | ||
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| avr | ||
| ceva | ||
| dummy | ||
| hc | ||
| mips | ||
| misoc | ||
| or1k | ||
| renesas | ||
| risc-v | ||
| sim | ||
| sparc | ||
| tricore | ||
| x86 | ||
| x86_64 | ||
| xtensa | ||
| z16 | ||
| z80 | ||
| CMakeLists.txt | ||
| Kconfig | ||