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| author | Arnd Bergmann <arnd@arndb.de> | 2019-06-18 14:19:42 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2019-06-27 09:28:01 +0300 |
| commit | 473971187d6727609951858c63bf12b0307ef015 (patch) | |
| tree | 7aced6bb5402810d105b25f07090ccad78200644 /crypto | |
| parent | 149c4e6ef7788d58b9c05eed9fb85e0f5a2c3456 (diff) | |
| download | linux-473971187d6727609951858c63bf12b0307ef015.tar.xz | |
crypto: serpent - mark __serpent_setkey_sbox noinline
The same bug that gcc hit in the past is apparently now showing
up with clang, which decides to inline __serpent_setkey_sbox:
crypto/serpent_generic.c:268:5: error: stack frame size of 2112 bytes in function '__serpent_setkey' [-Werror,-Wframe-larger-than=]
Marking it 'noinline' reduces the stack usage from 2112 bytes to
192 and 96 bytes, respectively, and seems to generate more
useful object code.
Fixes: c871c10e4ea7 ("crypto: serpent - improve __serpent_setkey with UBSAN")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/serpent_generic.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/crypto/serpent_generic.c b/crypto/serpent_generic.c index f2f549330d2b..e133006b2217 100644 --- a/crypto/serpent_generic.c +++ b/crypto/serpent_generic.c @@ -229,7 +229,13 @@ x4 ^= x2; \ }) -static void __serpent_setkey_sbox(u32 r0, u32 r1, u32 r2, u32 r3, u32 r4, u32 *k) +/* + * both gcc and clang have misoptimized this function in the past, + * producing horrible object code from spilling temporary variables + * on the stack. Forcing this part out of line avoids that. + */ +static noinline void __serpent_setkey_sbox(u32 r0, u32 r1, u32 r2, + u32 r3, u32 r4, u32 *k) { k += 100; S3(r3, r4, r0, r1, r2); store_and_load_keys(r1, r2, r4, r3, 28, 24); |