crypto: Work around deallocated stack frame reference gcc bug on sparc.

commit d41519a69b35b10af7fda867fb9100df24fdf403 upstream.

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.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/hash.c b/fs/btrfs/hash.c
index a97fdc156a03512bf36df40dd1b4278df845115f..baacc18668611b778b9270256a8962b439e4b78e 100644 (file)
--- a/fs/btrfs/hash.c
+++ b/fs/btrfs/hash.c
@@ -38,6 +38,7 @@ u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length)
 {
        SHASH_DESC_ON_STACK(shash, tfm);
        u32 *ctx = (u32 *)shash_desc_ctx(shash);
+       u32 retval;
        int err;
 
        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);
        BUG_ON(err);
 
-       return *ctx;
+       retval = *ctx;
+       barrier_data(ctx);
+       return retval;
 }

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index c12f695923b6e538d74a9edf7f0e6c5a79369774..88e111ab068bcb02d33e5d26fd77542867a2bfde 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -948,6 +948,7 @@ static inline u32 f2fs_crc32(struct f2fs_sb_info *sbi, const void *address,
 {
        SHASH_DESC_ON_STACK(shash, sbi->s_chksum_driver);
        u32 *ctx = (u32 *)shash_desc_ctx(shash);
+       u32 retval;
        int err;
 
        shash->tfm = sbi->s_chksum_driver;
@@ -957,7 +958,9 @@ static inline u32 f2fs_crc32(struct f2fs_sb_info *sbi, const void *address,
        err = crypto_shash_update(shash, address, length);
        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,

diff --git a/lib/libcrc32c.c b/lib/libcrc32c.c
index 74a54b7f25626e8c6d224af2b7384f7dcbf2e72f..9f79547d1b9782237a563f6a2e838655f6adf6dc 100644 (file)
--- a/lib/libcrc32c.c
+++ b/lib/libcrc32c.c
@@ -43,7 +43,7 @@ static struct crypto_shash *tfm;
 u32 crc32c(u32 crc, const void *address, unsigned int length)
 {
        SHASH_DESC_ON_STACK(shash, tfm);
-       u32 *ctx = (u32 *)shash_desc_ctx(shash);
+       u32 ret, *ctx = (u32 *)shash_desc_ctx(shash);
        int err;
 
        shash->tfm = tfm;
@@ -53,7 +53,9 @@ u32 crc32c(u32 crc, const void *address, unsigned int length)
        err = crypto_shash_update(shash, address, length);
        BUG_ON(err);
 
-       return *ctx;
+       ret = *ctx;
+       barrier_data(ctx);
+       return ret;
 }
 
 EXPORT_SYMBOL(crc32c);