mirror of
https://github.com/torvalds/linux.git
synced 2025-10-31 16:48:26 +02:00
89f42df66c
The constraints of the DFLTCC inline assembly are not precise: they do not
communicate the size of the output buffers to the compiler, so it cannot
automatically instrument it.
Add the manual kmsan_unpoison_memory() calls for the output buffers. The
logic is the same as in [1].
[1] 1f5ddcc009
Link: https://lkml.kernel.org/r/20240621113706.315500-21-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reported-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: <kasan-dev@googlegroups.com>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
// SPDX-License-Identifier: Zlib
|
|
#ifndef DFLTCC_UTIL_H
|
|
#define DFLTCC_UTIL_H
|
|
|
|
#include "dfltcc.h"
|
|
#include <linux/kmsan-checks.h>
|
|
#include <linux/zutil.h>
|
|
|
|
/*
|
|
* C wrapper for the DEFLATE CONVERSION CALL instruction.
|
|
*/
|
|
typedef enum {
|
|
DFLTCC_CC_OK = 0,
|
|
DFLTCC_CC_OP1_TOO_SHORT = 1,
|
|
DFLTCC_CC_OP2_TOO_SHORT = 2,
|
|
DFLTCC_CC_OP2_CORRUPT = 2,
|
|
DFLTCC_CC_AGAIN = 3,
|
|
} dfltcc_cc;
|
|
|
|
#define DFLTCC_QAF 0
|
|
#define DFLTCC_GDHT 1
|
|
#define DFLTCC_CMPR 2
|
|
#define DFLTCC_XPND 4
|
|
#define HBT_CIRCULAR (1 << 7)
|
|
#define DFLTCC_FN_MASK ((1 << 7) - 1)
|
|
#define HB_BITS 15
|
|
#define HB_SIZE (1 << HB_BITS)
|
|
|
|
static inline dfltcc_cc dfltcc(
|
|
int fn,
|
|
void *param,
|
|
Byte **op1,
|
|
size_t *len1,
|
|
const Byte **op2,
|
|
size_t *len2,
|
|
void *hist
|
|
)
|
|
{
|
|
Byte *t2 = op1 ? *op1 : NULL;
|
|
unsigned char *orig_t2 = t2;
|
|
size_t t3 = len1 ? *len1 : 0;
|
|
const Byte *t4 = op2 ? *op2 : NULL;
|
|
size_t t5 = len2 ? *len2 : 0;
|
|
register int r0 __asm__("r0") = fn;
|
|
register void *r1 __asm__("r1") = param;
|
|
register Byte *r2 __asm__("r2") = t2;
|
|
register size_t r3 __asm__("r3") = t3;
|
|
register const Byte *r4 __asm__("r4") = t4;
|
|
register size_t r5 __asm__("r5") = t5;
|
|
int cc;
|
|
|
|
__asm__ volatile(
|
|
".insn rrf,0xb9390000,%[r2],%[r4],%[hist],0\n"
|
|
"ipm %[cc]\n"
|
|
: [r2] "+r" (r2)
|
|
, [r3] "+r" (r3)
|
|
, [r4] "+r" (r4)
|
|
, [r5] "+r" (r5)
|
|
, [cc] "=r" (cc)
|
|
: [r0] "r" (r0)
|
|
, [r1] "r" (r1)
|
|
, [hist] "r" (hist)
|
|
: "cc", "memory");
|
|
t2 = r2; t3 = r3; t4 = r4; t5 = r5;
|
|
|
|
/*
|
|
* Unpoison the parameter block and the output buffer.
|
|
* This is a no-op in non-KMSAN builds.
|
|
*/
|
|
switch (fn & DFLTCC_FN_MASK) {
|
|
case DFLTCC_QAF:
|
|
kmsan_unpoison_memory(param, sizeof(struct dfltcc_qaf_param));
|
|
break;
|
|
case DFLTCC_GDHT:
|
|
kmsan_unpoison_memory(param, offsetof(struct dfltcc_param_v0, csb));
|
|
break;
|
|
case DFLTCC_CMPR:
|
|
kmsan_unpoison_memory(param, sizeof(struct dfltcc_param_v0));
|
|
kmsan_unpoison_memory(
|
|
orig_t2,
|
|
t2 - orig_t2 +
|
|
(((struct dfltcc_param_v0 *)param)->sbb == 0 ? 0 : 1));
|
|
break;
|
|
case DFLTCC_XPND:
|
|
kmsan_unpoison_memory(param, sizeof(struct dfltcc_param_v0));
|
|
kmsan_unpoison_memory(orig_t2, t2 - orig_t2);
|
|
break;
|
|
}
|
|
|
|
if (op1)
|
|
*op1 = t2;
|
|
if (len1)
|
|
*len1 = t3;
|
|
if (op2)
|
|
*op2 = t4;
|
|
if (len2)
|
|
*len2 = t5;
|
|
return (cc >> 28) & 3;
|
|
}
|
|
|
|
static inline int is_bit_set(
|
|
const char *bits,
|
|
int n
|
|
)
|
|
{
|
|
return bits[n / 8] & (1 << (7 - (n % 8)));
|
|
}
|
|
|
|
static inline void turn_bit_off(
|
|
char *bits,
|
|
int n
|
|
)
|
|
{
|
|
bits[n / 8] &= ~(1 << (7 - (n % 8)));
|
|
}
|
|
|
|
static inline int dfltcc_are_params_ok(
|
|
int level,
|
|
uInt window_bits,
|
|
int strategy,
|
|
uLong level_mask
|
|
)
|
|
{
|
|
return (level_mask & (1 << level)) != 0 &&
|
|
(window_bits == HB_BITS) &&
|
|
(strategy == Z_DEFAULT_STRATEGY);
|
|
}
|
|
|
|
char *oesc_msg(char *buf, int oesc);
|
|
|
|
#endif /* DFLTCC_UTIL_H */
|