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qlge: Avoid reading past end of buffer

PATCH Applied Kees Cook 2 participants 2 messages May 5, 2017 – May 8, 2017

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Kees Cook

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#0 lore raw

PATCH 1/1 qlge: Avoid reading past end of buffer

Using memcpy() from a string that is shorter than the length copied means the destination buffer is being filled with arbitrary data from the kernel rodata segment. Instead, use strncpy() which will fill the trailing bytes with zeros.

This was found with the future CONFIG_FORTIFY_SOURCE feature.

Cc Daniel Micay <[email protected]>
Signed-off-by Kees Cook <[email protected]>
---
 drivers/net/ethernet/qlogic/qlge/qlge_dbg.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
drivers/net/ethernet/qlogic/qlge/qlge_dbg.c +2 -2
index 829be21f97b2..28ea0af89aef 100644
@@ -765,7 +765,7 @@ int ql_core_dump(struct ql_adapter *qdev, struct ql_mpi_coredump *mpi_coredump)
 		sizeof(struct mpi_coredump_global_header);
 	mpi_coredump->mpi_global_header.imageSize =
 		sizeof(struct ql_mpi_coredump);
-	memcpy(mpi_coredump->mpi_global_header.idString, "MPI Coredump",
+	strncpy(mpi_coredump->mpi_global_header.idString, "MPI Coredump",
 		sizeof(mpi_coredump->mpi_global_header.idString));
 
 	/* Get generic NIC reg dump */

@@ -1255,7 +1255,7 @@ static void ql_gen_reg_dump(struct ql_adapter *qdev,
 		sizeof(struct mpi_coredump_global_header);
 	mpi_coredump->mpi_global_header.imageSize =
 		sizeof(struct ql_reg_dump);
-	memcpy(mpi_coredump->mpi_global_header.idString, "MPI Coredump",
+	strncpy(mpi_coredump->mpi_global_header.idString, "MPI Coredump",
 		sizeof(mpi_coredump->mpi_global_header.idString));
Signature · 6 lines
2.7.4


-- 
Kees Cook
Pixel Security
maintainer Applied
#1 lore raw

From: Kees Cook <[email protected]>
Date: Fri, 5 May 2017 15:34:34 -0700

Quoted 9 lines

Using memcpy() from a string that is shorter than the length copied means the destination buffer is being filled with arbitrary data from the kernel rodata segment. Instead, use strncpy() which will fill the trailing bytes with zeros.

This was found with the future CONFIG_FORTIFY_SOURCE feature.

Cc Daniel Micay <[email protected]>
Signed-off-by Kees Cook <[email protected]>

Applied.