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Workaround UBSAN errors for variable arrays

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This gets around UBSAN errors when using arrays at the end of
structs.  It converts some zero-length arrays to variable length
arrays and disables UBSAN checking on certain modules.

It is based off of the patch from #15460.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Tested-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Co-authored-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Issue #15145
Closes #15510
This commit is contained in:
Tony Hutter 2023-11-12 16:26:07 -08:00 committed by Brian Behlendorf
parent 94a830adf6
commit bb1dd98bcc
4 changed files with 9 additions and 3 deletions
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2
include/os/linux/spl/sys/kmem_cache.h
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@ -111,7 +111,7 @@ typedef struct spl_kmem_magazine {
uint32_t skm_refill; /* Batch refill size */
struct spl_kmem_cache *skm_cache; /* Owned by cache */
unsigned int skm_cpu; /* Owned by cpu */
void *skm_objs[0]; /* Object pointers */
void *skm_objs[]; /* Object pointers */
} spl_kmem_magazine_t;
typedef struct spl_kmem_obj {

4
include/sys/vdev_raidz_impl.h
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@ -130,7 +130,7 @@ typedef struct raidz_row {
uint64_t rr_offset; /* Logical offset for *_io_verify() */
uint64_t rr_size; /* Physical size for *_io_verify() */
#endif
raidz_col_t rr_col[0]; /* Flexible array of I/O columns */
raidz_col_t rr_col[]; /* Flexible array of I/O columns */
} raidz_row_t;
typedef struct raidz_map {
@ -139,7 +139,7 @@ typedef struct raidz_map {
int rm_nskip; /* RAIDZ sectors skipped for padding */
int rm_skipstart; /* Column index of padding start */
const raidz_impl_ops_t *rm_ops; /* RAIDZ math operations */
raidz_row_t *rm_row[0]; /* flexible array of rows */
raidz_row_t *rm_row[]; /* flexible array of rows */
} raidz_map_t;

2
module/icp/Makefile.in
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@ -69,6 +69,8 @@ OBJECT_FILES_NON_STANDARD_aesni-gcm-x86_64.o := y
OBJECT_FILES_NON_STANDARD_sha256_impl.o := y
OBJECT_FILES_NON_STANDARD_sha512_impl.o := y
UBSAN_SANITIZE_modhash.o := n
ICP_DIRS = \
api \
core \

4
module/zfs/Makefile.in
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@ -159,4 +159,8 @@ CFLAGS_REMOVE_vdev_raidz_math_aarch64_neon.o += -mgeneral-regs-only
CFLAGS_REMOVE_vdev_raidz_math_aarch64_neonx2.o += -mgeneral-regs-only
endif
UBSAN_SANITIZE_zap_leaf.o := n
UBSAN_SANITIZE_zap_micro.o := n
UBSAN_SANITIZE_sa.o := n
include $(mfdir)/../os/linux/zfs/Makefile