crypto: Work around deallocated stack frame reference gcc bug on sparc.
On sparc, if we have an alloca() like situation, as is the case with SHASH_DESC_ON_STACK(), we can end up referencing deallocated stack memory. The result can be that the value is clobbered if a trap or interrupt arrives at just the right instruction. It only occurs if the function ends returning a value from that alloca() area and that value can be placed into the return value register using a single instruction. For example, in lib/libcrc32c.c:crc32c() we end up with a return sequence like: return %i7+8 lduw [%o5+16], %o0 ! MEM[(u32 *)__shash_desc.1_10 + 16B], %o5 holds the base of the on-stack area allocated for the shash descriptor. But the return released the stack frame and the register window. So if an intererupt arrives between 'return' and 'lduw', then the value read at %o5+16 can be corrupted. Add a data compiler barrier to work around this problem. This is exactly what the gcc fix will end up doing as well, and it absolutely should not change the code generated for other cpus (unless gcc on them has the same bug :-) With crucial insight from Eric Sandeen. Cc: <stable@vger.kernel.org> Reported-by: Anatoly Pugachev <matorola@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
parent
f3ad587070
commit
d41519a69b
@ -68,6 +68,7 @@
|
|||||||
static inline u32 rxe_crc32(struct rxe_dev *rxe,
|
static inline u32 rxe_crc32(struct rxe_dev *rxe,
|
||||||
u32 crc, void *next, size_t len)
|
u32 crc, void *next, size_t len)
|
||||||
{
|
{
|
||||||
|
u32 retval;
|
||||||
int err;
|
int err;
|
||||||
|
|
||||||
SHASH_DESC_ON_STACK(shash, rxe->tfm);
|
SHASH_DESC_ON_STACK(shash, rxe->tfm);
|
||||||
@ -81,7 +82,9 @@ static inline u32 rxe_crc32(struct rxe_dev *rxe,
|
|||||||
return crc32_le(crc, next, len);
|
return crc32_le(crc, next, len);
|
||||||
}
|
}
|
||||||
|
|
||||||
return *(u32 *)shash_desc_ctx(shash);
|
retval = *(u32 *)shash_desc_ctx(shash);
|
||||||
|
barrier_data(shash_desc_ctx(shash));
|
||||||
|
return retval;
|
||||||
}
|
}
|
||||||
|
|
||||||
int rxe_set_mtu(struct rxe_dev *rxe, unsigned int dev_mtu);
|
int rxe_set_mtu(struct rxe_dev *rxe, unsigned int dev_mtu);
|
||||||
|
@ -38,6 +38,7 @@ u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length)
|
|||||||
{
|
{
|
||||||
SHASH_DESC_ON_STACK(shash, tfm);
|
SHASH_DESC_ON_STACK(shash, tfm);
|
||||||
u32 *ctx = (u32 *)shash_desc_ctx(shash);
|
u32 *ctx = (u32 *)shash_desc_ctx(shash);
|
||||||
|
u32 retval;
|
||||||
int err;
|
int err;
|
||||||
|
|
||||||
shash->tfm = tfm;
|
shash->tfm = tfm;
|
||||||
@ -47,5 +48,7 @@ u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length)
|
|||||||
err = crypto_shash_update(shash, address, length);
|
err = crypto_shash_update(shash, address, length);
|
||||||
BUG_ON(err);
|
BUG_ON(err);
|
||||||
|
|
||||||
return *ctx;
|
retval = *ctx;
|
||||||
|
barrier_data(ctx);
|
||||||
|
return retval;
|
||||||
}
|
}
|
||||||
|
@ -1078,6 +1078,7 @@ static inline u32 f2fs_crc32(struct f2fs_sb_info *sbi, const void *address,
|
|||||||
{
|
{
|
||||||
SHASH_DESC_ON_STACK(shash, sbi->s_chksum_driver);
|
SHASH_DESC_ON_STACK(shash, sbi->s_chksum_driver);
|
||||||
u32 *ctx = (u32 *)shash_desc_ctx(shash);
|
u32 *ctx = (u32 *)shash_desc_ctx(shash);
|
||||||
|
u32 retval;
|
||||||
int err;
|
int err;
|
||||||
|
|
||||||
shash->tfm = sbi->s_chksum_driver;
|
shash->tfm = sbi->s_chksum_driver;
|
||||||
@ -1087,7 +1088,9 @@ static inline u32 f2fs_crc32(struct f2fs_sb_info *sbi, const void *address,
|
|||||||
err = crypto_shash_update(shash, address, length);
|
err = crypto_shash_update(shash, address, length);
|
||||||
BUG_ON(err);
|
BUG_ON(err);
|
||||||
|
|
||||||
return *ctx;
|
retval = *ctx;
|
||||||
|
barrier_data(ctx);
|
||||||
|
return retval;
|
||||||
}
|
}
|
||||||
|
|
||||||
static inline bool f2fs_crc_valid(struct f2fs_sb_info *sbi, __u32 blk_crc,
|
static inline bool f2fs_crc_valid(struct f2fs_sb_info *sbi, __u32 blk_crc,
|
||||||
|
@ -43,7 +43,7 @@ static struct crypto_shash *tfm;
|
|||||||
u32 crc32c(u32 crc, const void *address, unsigned int length)
|
u32 crc32c(u32 crc, const void *address, unsigned int length)
|
||||||
{
|
{
|
||||||
SHASH_DESC_ON_STACK(shash, tfm);
|
SHASH_DESC_ON_STACK(shash, tfm);
|
||||||
u32 *ctx = (u32 *)shash_desc_ctx(shash);
|
u32 ret, *ctx = (u32 *)shash_desc_ctx(shash);
|
||||||
int err;
|
int err;
|
||||||
|
|
||||||
shash->tfm = tfm;
|
shash->tfm = tfm;
|
||||||
@ -53,7 +53,9 @@ u32 crc32c(u32 crc, const void *address, unsigned int length)
|
|||||||
err = crypto_shash_update(shash, address, length);
|
err = crypto_shash_update(shash, address, length);
|
||||||
BUG_ON(err);
|
BUG_ON(err);
|
||||||
|
|
||||||
return *ctx;
|
ret = *ctx;
|
||||||
|
barrier_data(ctx);
|
||||||
|
return ret;
|
||||||
}
|
}
|
||||||
|
|
||||||
EXPORT_SYMBOL(crc32c);
|
EXPORT_SYMBOL(crc32c);
|
||||||
|
Loading…
Reference in New Issue
Block a user