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riscv: Do not use fortify in early code

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Early code designates the code executed when the MMU is not yet enabled,
and this comes with some limitations (see
Documentation/arch/riscv/boot.rst, section "Pre-MMU execution").

FORTIFY_SOURCE must be disabled then since it can trigger kernel panics
as reported in [1].

Reported-by: Jason Montleon <jmontleo@redhat.com>
Closes: https://lore.kernel.org/linux-riscv/CAJD_bPJes4QhmXY5f63GHV9B9HFkSCoaZjk-qCT2NGS7Q9HODg@mail.gmail.com/ [1]
Fixes: a35707c3d8 ("riscv: add memory-type errata for T-Head")
Fixes: 26e7aacb83 ("riscv: Allow to downgrade paging mode from the command line")
Cc: stable@vger.kernel.org
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20241009072749.45006-1-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Alexandre Ghiti 2024-10-09 09:27:49 +02:00 committed by Palmer Dabbelt
parent 1966db682f
commit afedc3126e
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
3 changed files with 16 additions and 1 deletions
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6
arch/riscv/errata/Makefile
View File

@ -2,6 +2,12 @@ ifdef CONFIG_RELOCATABLE
KBUILD_CFLAGS += -fno-pie
endif
ifdef CONFIG_RISCV_ALTERNATIVE_EARLY
ifdef CONFIG_FORTIFY_SOURCE
KBUILD_CFLAGS += -D__NO_FORTIFY
endif
endif
obj-$(CONFIG_ERRATA_ANDES) += andes/
obj-$(CONFIG_ERRATA_SIFIVE) += sifive/
obj-$(CONFIG_ERRATA_THEAD) += thead/

5
arch/riscv/kernel/Makefile
View File

@ -36,6 +36,11 @@ KASAN_SANITIZE_alternative.o := n
KASAN_SANITIZE_cpufeature.o := n
KASAN_SANITIZE_sbi_ecall.o := n
endif
ifdef CONFIG_FORTIFY_SOURCE
CFLAGS_alternative.o += -D__NO_FORTIFY
CFLAGS_cpufeature.o += -D__NO_FORTIFY
CFLAGS_sbi_ecall.o += -D__NO_FORTIFY
endif
endif
extra-y += vmlinux.lds

6
arch/riscv/kernel/pi/Makefile
View File

@ -16,8 +16,12 @@ KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO), $(KBUILD_CFLAGS))
KBUILD_CFLAGS += -mcmodel=medany
CFLAGS_cmdline_early.o += -D__NO_FORTIFY
CFLAGS_lib-fdt_ro.o += -D__NO_FORTIFY
CFLAGS_fdt_early.o += -D__NO_FORTIFY
# lib/string.c already defines __NO_FORTIFY
CFLAGS_ctype.o += -D__NO_FORTIFY
CFLAGS_lib-fdt.o += -D__NO_FORTIFY
CFLAGS_lib-fdt_ro.o += -D__NO_FORTIFY
CFLAGS_archrandom_early.o += -D__NO_FORTIFY
$(obj)/%.pi.o: OBJCOPYFLAGS := --prefix-symbols=__pi_ \
--remove-section=.note.gnu.property \