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riscv: Disable preemption when using patch_map()

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patch_map() uses fixmap mappings to circumvent the non-writability of
the kernel text mapping.

The __set_fixmap() function only flushes the current cpu tlb, it does
not emit an IPI so we must make sure that while we use a fixmap mapping,
the current task is not migrated on another cpu which could miss the
newly introduced fixmap mapping.

So in order to avoid any task migration, disable the preemption.

Reported-by: Andrea Parri <andrea@rivosinc.com>
Closes: https://lore.kernel.org/all/ZcS+GAaM25LXsBOl@andrea/
Reported-by: Andy Chiu <andy.chiu@sifive.com>
Closes: https://lore.kernel.org/linux-riscv/CABgGipUMz3Sffu-CkmeUB1dKVwVQ73+7=sgC45-m0AE9RCjOZg@mail.gmail.com/
Fixes: cad539baa4 ("riscv: implement a memset like function for text")
Fixes: 0ff7c3b331 ("riscv: Use text_mutex instead of patch_lock")
Co-developed-by: Andy Chiu <andy.chiu@sifive.com>
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Acked-by: Puranjay Mohan <puranjay12@gmail.com>
Link: https://lore.kernel.org/r/20240326203017.310422-3-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Alexandre Ghiti 2024-03-26 21:30:17 +01:00 committed by Palmer Dabbelt
parent 8a48ea87ce
commit a370c2419e
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1 changed files with 8 additions and 0 deletions
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8
arch/riscv/kernel/patch.c
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@ -80,6 +80,8 @@ static int __patch_insn_set(void *addr, u8 c, size_t len)
*/
lockdep_assert_held(&text_mutex);
preempt_disable();
if (across_pages)
patch_map(addr + PAGE_SIZE, FIX_TEXT_POKE1);
@ -92,6 +94,8 @@ static int __patch_insn_set(void *addr, u8 c, size_t len)
if (across_pages)
patch_unmap(FIX_TEXT_POKE1);
preempt_enable();
return 0;
}
NOKPROBE_SYMBOL(__patch_insn_set);
@ -122,6 +126,8 @@ static int __patch_insn_write(void *addr, const void *insn, size_t len)
if (!riscv_patch_in_stop_machine)
lockdep_assert_held(&text_mutex);
preempt_disable();
if (across_pages)
patch_map(addr + PAGE_SIZE, FIX_TEXT_POKE1);
@ -134,6 +140,8 @@ static int __patch_insn_write(void *addr, const void *insn, size_t len)
if (across_pages)
patch_unmap(FIX_TEXT_POKE1);
preempt_enable();
return ret;
}
NOKPROBE_SYMBOL(__patch_insn_write);