diff options
authorBorislav Petkov <bp@suse.de>2017-11-23 10:19:51 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-11-23 20:17:59 +0100
commite2a5dca753d1cdc3212519023ed8a13e13f5495b (patch)
parent69550d41ff9c884c6d996fca41037974b2255852 (diff)
x86/umip: Fix insn_get_code_seg_params()'s return value
In order to save on redundant structs definitions insn_get_code_seg_params() was made to return two 4-bit values in a char but clang complains: arch/x86/lib/insn-eval.c:780:10: warning: implicit conversion from 'int' to 'char' changes value from 132 to -124 [-Wconstant-conversion] return INSN_CODE_SEG_PARAMS(4, 8); ~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~ ./arch/x86/include/asm/insn-eval.h:16:57: note: expanded from macro 'INSN_CODE_SEG_PARAMS' #define INSN_CODE_SEG_PARAMS(oper_sz, addr_sz) (oper_sz | (addr_sz << 4)) Those two values do get picked apart afterwards the opposite way of how they were ORed so wrt to the LSByte, the return value is the same. But this function returns -EINVAL in the error case, which is an int. So make it return an int which is the native word size anyway and thus fix the clang warning. Reported-by: Kees Cook <keescook@google.com> Reported-by: Nick Desaulniers <nick.desaulniers@gmail.com> Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: ricardo.neri-calderon@linux.intel.com Link: https://lkml.kernel.org/r/20171123091951.1462-1-bp@alien8.de
3 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/include/asm/insn-eval.h b/arch/x86/include/asm/insn-eval.h
index e1d3b4ce8a92..2b6ccf2c49f1 100644
--- a/arch/x86/include/asm/insn-eval.h
+++ b/arch/x86/include/asm/insn-eval.h
@@ -18,6 +18,6 @@
void __user *insn_get_addr_ref(struct insn *insn, struct pt_regs *regs);
int insn_get_modrm_rm_off(struct insn *insn, struct pt_regs *regs);
unsigned long insn_get_seg_base(struct pt_regs *regs, int seg_reg_idx);
-char insn_get_code_seg_params(struct pt_regs *regs);
+int insn_get_code_seg_params(struct pt_regs *regs);
#endif /* _ASM_X86_INSN_EVAL_H */
diff --git a/arch/x86/kernel/umip.c b/arch/x86/kernel/umip.c
index dabbac30acdf..f44ce0fb3583 100644
--- a/arch/x86/kernel/umip.c
+++ b/arch/x86/kernel/umip.c
@@ -319,7 +319,7 @@ bool fixup_umip_exception(struct pt_regs *regs)
unsigned char buf[MAX_INSN_SIZE];
void __user *uaddr;
struct insn insn;
- char seg_defs;
+ int seg_defs;
if (!regs)
return false;
diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c
index 35625d279458..9119d8e41f1f 100644
--- a/arch/x86/lib/insn-eval.c
+++ b/arch/x86/lib/insn-eval.c
@@ -733,11 +733,11 @@ static unsigned long get_seg_limit(struct pt_regs *regs, int seg_reg_idx)
* Returns:
- * A signed 8-bit value containing the default parameters on success.
+ * An int containing ORed-in default parameters on success.
* -EINVAL on error.
-char insn_get_code_seg_params(struct pt_regs *regs)
+int insn_get_code_seg_params(struct pt_regs *regs)
struct desc_struct *desc;
short sel;

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