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scsi: elx: libefc: Fix second parameter type in state callbacks

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[ Upstream commit 3d75e766b5 ]

With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG),
indirect call targets are validated against the expected function pointer
prototype to make sure the call target is valid to help mitigate ROP
attacks. If they are not identical, there is a failure at run time, which
manifests as either a kernel panic or thread getting killed. A proposed
warning in clang aims to catch these at compile time, which reveals:

  drivers/scsi/elx/libefc/efc_node.c:811:22: error: incompatible function pointer types assigning to 'void (*)(struct efc_sm_ctx *, u32, void *)' (aka 'void (*)(struct efc_sm_ctx *, unsigned int, void *)') from 'void (*)(struct efc_sm_ctx *, enum efc_sm_event, void *)' [-Werror,-Wincompatible-function-pointer-types-strict]
                  ctx->current_state = state;
                                    ^ ~~~~~
  drivers/scsi/elx/libefc/efc_node.c:878:21: error: incompatible function pointer types assigning to 'void (*)(struct efc_sm_ctx *, u32, void *)' (aka 'void (*)(struct efc_sm_ctx *, unsigned int, void *)') from 'void (*)(struct efc_sm_ctx *, enum efc_sm_event, void *)' [-Werror,-Wincompatible-function-pointer-types-strict]
          node->nodedb_state = state;
                            ^ ~~~~~
  drivers/scsi/elx/libefc/efc_node.c:905:6: error: incompatible function pointer types assigning to 'void (*)(struct efc_sm_ctx *, enum efc_sm_event, void *)' from 'void (*)(struct efc_sm_ctx *, u32, void *)' (aka 'void (*)(struct efc_sm_ctx *, unsigned int, void *)') [-Werror,-Wincompatible-function-pointer-types-strict]
                  pf = node->nodedb_state;
                    ^ ~~~~~~~~~~~~~~~~~~

  drivers/scsi/elx/libefc/efc_device.c:455:22: error: incompatible function pointer types assigning to 'void (*)(struct efc_sm_ctx *, u32, void *)' (aka 'void (*)(struct efc_sm_ctx *, unsigned int, void *)') from 'void (struct efc_sm_ctx *, enum efc_sm_event, void *)' [-Werror,-Wincompatible-function-pointer-types-strict]
                  node->nodedb_state = __efc_d_init;
                                    ^ ~~~~~~~~~~~~

  drivers/scsi/elx/libefc/efc_sm.c:41:22: error: incompatible function pointer types assigning to 'void (*)(struct efc_sm_ctx *, u32, void *)' (aka 'void (*)(struct efc_sm_ctx *, unsigned int, void *)') from 'void (*)(struct efc_sm_ctx *, enum efc_sm_event, void *)' [-Werror,-Wincompatible-function-pointer-types-strict]
                  ctx->current_state = state;
                                    ^ ~~~~~

The type of the second parameter in the prototypes of ->current_state() and
->nodedb_state() ('u32') does not match the implementations, which have a
second parameter type of 'enum efc_sm_event'. Update the prototypes to have
the correct second parameter type, clearing up all the warnings and CFI
failures.

Link: https://github.com/ClangBuiltLinux/linux/issues/1750
Reported-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20221102161906.2781508-1-nathan@kernel.org
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nathan Chancellor 2022-11-02 09:19:06 -07:00 committed by Greg Kroah-Hartman
parent 23f0e9f863
commit 4f6b206998
1 changed files with 4 additions and 2 deletions
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6
drivers/scsi/elx/libefc/efclib.h
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@ -58,10 +58,12 @@ enum efc_node_send_ls_acc {
#define EFC_LINK_STATUS_UP 0
#define EFC_LINK_STATUS_DOWN 1
enum efc_sm_event;
/* State machine context header */
struct efc_sm_ctx {
void (*current_state)(struct efc_sm_ctx *ctx,
u32 evt, void *arg);
enum efc_sm_event evt, void *arg);
const char *description;
void *app;
@ -364,7 +366,7 @@ struct efc_node {
int prev_evt;
void (*nodedb_state)(struct efc_sm_ctx *ctx,
u32 evt, void *arg);
enum efc_sm_event evt, void *arg);
struct timer_list gidpt_delay_timer;
u64 time_last_gidpt_msec;