diff options
| author |  Kees Cook <keescook@chromium.org>
| 2023-06-01 09:00:28 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org>
| 2023-06-05 15:31:07 -0700 |
| commit | 8762606ae22e71ec65249cdbf809e3dc7ea8ea1e (patch) | |
| tree | 177ad0c0762bddfaab5ce7806f76d334e9d4b1fb /arch/riscv/purgatory | |
| parent | s390/purgatory: Do not use fortified string functions (diff) | |
| download | linux-8762606ae22e71ec65249cdbf809e3dc7ea8ea1e.tar.gz linux-8762606ae22e71ec65249cdbf809e3dc7ea8ea1e.tar.bz2 linux-8762606ae22e71ec65249cdbf809e3dc7ea8ea1e.zip | |
riscv/purgatory: Do not use fortified string functions
With the addition of -fstrict-flex-arrays=3, struct sha256_state's
trailing array is no longer ignored by CONFIG_FORTIFY_SOURCE:
struct sha256_state {
u32 state[SHA256_DIGEST_SIZE / 4];
u64 count;
u8 buf[SHA256_BLOCK_SIZE];
};
This means that the memcpy() calls with "buf" as a destination in
sha256.c's code will attempt to perform run-time bounds checking, which
could lead to calling missing functions, specifically a potential
WARN_ONCE, which isn't callable from purgatory.
Reported-by: Thorsten Leemhuis <linux@leemhuis.info>
Closes: https://lore.kernel.org/lkml/175578ec-9dec-7a9c-8d3a-43f24ff86b92@leemhuis.info/
Bisected-by: "Joan Bruguera Micó" <joanbrugueram@gmail.com>
Fixes: df8fc4e934c1 ("kbuild: Enable -fstrict-flex-arrays=3")
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Conor Dooley <conor.dooley@microchip.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Alyssa Ross <hi@alyssa.is>
Cc: Heiko Stuebner <heiko.stuebner@vrull.eu>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: linux-riscv@lists.infradead.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Link: https://lore.kernel.org/r/20230601160025.gonna.868-kees@kernel.org
Diffstat (limited to 'arch/riscv/purgatory')
| -rw-r--r-- | arch/riscv/purgatory/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/riscv/purgatory/Makefile b/arch/riscv/purgatory/Makefile index 5730797a6b40..8c73360c42bb 100644 --- a/arch/riscv/purgatory/Makefile +++ b/arch/riscv/purgatory/Makefile @@ -31,7 +31,7 @@ $(obj)/strncmp.o: $(srctree)/arch/riscv/lib/strncmp.S FORCE $(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE $(call if_changed_rule,cc_o_c) -CFLAGS_sha256.o := -D__DISABLE_EXPORTS +CFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_FORTIFY CFLAGS_string.o := -D__DISABLE_EXPORTS CFLAGS_ctype.o := -D__DISABLE_EXPORTS |