[PATCH 1/5] Renaming weak prng invocations - prandom_bytes_state, prandom_u32_state

From: david . keisarschm
Date: Sun Dec 11 2022 - 17:16:29 EST

From: David <david.keisarschm@xxxxxxxxxxxxxxx>

Since the two functions
prandom_byte_state and prandom_u32_state
use the weak prng prandom_u32,
we added the prefix predictable_rng,
to their signatures so it is clear they are weak.

Signed-off-by: David <david.keisarschm@xxxxxxxxxxxxxxx>
---
arch/x86/mm/kaslr.c | 2 +-
.../gpu/drm/i915/gem/selftests/huge_pages.c | 2 +-
.../i915/gem/selftests/i915_gem_client_blt.c | 2 +-
.../i915/gem/selftests/i915_gem_coherency.c | 2 +-
.../drm/i915/gem/selftests/i915_gem_context.c | 2 +-
drivers/gpu/drm/i915/gt/selftest_lrc.c | 2 +-
drivers/gpu/drm/i915/gt/selftest_migrate.c | 2 +-
drivers/gpu/drm/i915/gt/selftest_timeline.c | 4 +-
drivers/gpu/drm/i915/selftests/i915_random.c | 4 +-
drivers/gpu/drm/i915/selftests/i915_random.h | 4 +-
drivers/gpu/drm/i915/selftests/i915_syncmap.c | 4 +-
.../drm/i915/selftests/intel_memory_region.c | 10 ++---
drivers/gpu/drm/i915/selftests/scatterlist.c | 4 +-
drivers/gpu/drm/lib/drm_random.c | 2 +-
drivers/mtd/tests/oobtest.c | 10 ++---
drivers/mtd/tests/pagetest.c | 12 +++---
drivers/mtd/tests/subpagetest.c | 12 +++---
drivers/scsi/fcoe/fcoe_ctlr.c | 2 +-
include/linux/prandom.h | 6 +--
kernel/bpf/core.c | 2 +-
lib/interval_tree_test.c | 6 +--
lib/random32.c | 42 +++++++++----------
lib/rbtree_test.c | 4 +-
lib/test_bpf.c | 2 +-
lib/test_parman.c | 2 +-
lib/test_scanf.c | 8 ++--
mm/slab.c | 2 +-
mm/slab_common.c | 2 +-
28 files changed, 79 insertions(+), 79 deletions(-)

diff --git a/arch/x86/mm/kaslr.c b/arch/x86/mm/kaslr.c
index 557f0fe25..66c17b449 100644
--- a/arch/x86/mm/kaslr.c
+++ b/arch/x86/mm/kaslr.c
@@ -123,7 +123,7 @@ void __init kernel_randomize_memory(void)
* available.
*/
entropy = remain_entropy / (ARRAY_SIZE(kaslr_regions) - i);
- prandom_bytes_state(&rand_state, &rand, sizeof(rand));
+ predictable_rng_prandom_bytes_state(&rand_state, &rand, sizeof(rand));
entropy = (rand % (entropy + 1)) & PUD_MASK;
vaddr += entropy;
*kaslr_regions[i].base = vaddr;
diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
index c570cf780..f698d58e4 100644
--- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
+++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
@@ -1294,7 +1294,7 @@ static u32 igt_random_size(struct rnd_state *prng,
GEM_BUG_ON(min_page_size > max_page_size);

mask = ((max_page_size << 1ULL) - 1) & PAGE_MASK;
- size = prandom_u32_state(prng) & mask;
+ size = predictable_rng_prandom_u32_state(prng) & mask;
if (size < min_page_size)
size |= min_page_size;

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c
index 9a6a6b5b7..039f17b6b 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c
@@ -630,7 +630,7 @@ static int tiled_blits_prepare(struct tiled_blits *t,

/* Use scratch to fill objects */
for (i = 0; i < ARRAY_SIZE(t->buffers); i++) {
- fill_scratch(t, map, prandom_u32_state(prng));
+ fill_scratch(t, map, predictable_rng_prandom_u32_state(prng));
GEM_BUG_ON(verify_buffer(t, &t->scratch, prng));

err = tiled_blit(t,
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c
index a666d7e61..24cc7e6d4 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c
@@ -371,7 +371,7 @@ static int igt_gem_coherency(void *arg)

i915_random_reorder(offsets, ncachelines, &prng);
for (n = 0; n < count; n++)
- values[n] = prandom_u32_state(&prng);
+ values[n] = predictable_rng_prandom_u32_state(&prng);

for (n = 0; n < count; n++) {
err = over->set(&ctx, offsets[n], ~values[n]);
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
index c6ad67b90..6e437a1d6 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
@@ -1407,7 +1407,7 @@ static int igt_ctx_readonly(void *arg)
goto out_file;
}

- if (prandom_u32_state(&prng) & 1)
+ if (predictable_rng_prandom_u32_state(&prng) & 1)
i915_gem_object_set_readonly(obj);
}

diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index 82d3f8058..e2fe4fe8f 100644
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -1760,7 +1760,7 @@ static struct i915_request *garbage(struct intel_context *ce,
if (err)
return ERR_PTR(err);

- prandom_bytes_state(prng,
+ predictable_rng_prandom_bytes_state(prng,
ce->lrc_reg_state,
ce->engine->context_size -
LRC_STATE_OFFSET);
diff --git a/drivers/gpu/drm/i915/gt/selftest_migrate.c b/drivers/gpu/drm/i915/gt/selftest_migrate.c
index 2b0c87999..9b6e8cf52 100644
--- a/drivers/gpu/drm/i915/gt/selftest_migrate.c
+++ b/drivers/gpu/drm/i915/gt/selftest_migrate.c
@@ -551,7 +551,7 @@ static int threaded_migrate(struct intel_migrate *migrate,

thread[i].migrate = migrate;
thread[i].prng =
- I915_RND_STATE_INITIALIZER(prandom_u32_state(&prng));
+ I915_RND_STATE_INITIALIZER(predictable_rng_prandom_u32_state(&prng));

tsk = kthread_run(fn, &thread[i], "igt-%d", i);
if (IS_ERR(tsk)) {
diff --git a/drivers/gpu/drm/i915/gt/selftest_timeline.c b/drivers/gpu/drm/i915/gt/selftest_timeline.c
index 522d01905..5c8b662c6 100644
--- a/drivers/gpu/drm/i915/gt/selftest_timeline.c
+++ b/drivers/gpu/drm/i915/gt/selftest_timeline.c
@@ -308,7 +308,7 @@ static int bench_sync(void *arg)
u32 x;

/* Make sure the compiler doesn't optimise away the prng call */
- WRITE_ONCE(x, prandom_u32_state(&prng));
+ WRITE_ONCE(x, predictable_rng_prandom_u32_state(&prng));

count++;
} while (!time_after(jiffies, end_time));
@@ -393,7 +393,7 @@ static int bench_sync(void *arg)
end_time = jiffies + HZ/10;
do {
u32 id = random_engine(&prng);
- u32 seqno = prandom_u32_state(&prng);
+ u32 seqno = predictable_rng_prandom_u32_state(&prng);

if (!__intel_timeline_sync_is_later(&tl, id, seqno))
__intel_timeline_sync_set(&tl, id, seqno);
diff --git a/drivers/gpu/drm/i915/selftests/i915_random.c b/drivers/gpu/drm/i915/selftests/i915_random.c
index abdfadcf6..e6b56688e 100644
--- a/drivers/gpu/drm/i915/selftests/i915_random.c
+++ b/drivers/gpu/drm/i915/selftests/i915_random.c
@@ -35,9 +35,9 @@ u64 i915_prandom_u64_state(struct rnd_state *rnd)
{
u64 x;

- x = prandom_u32_state(rnd);
+ x = predictable_rng_prandom_u32_state(rnd);
x <<= 32;
- x |= prandom_u32_state(rnd);
+ x |= predictable_rng_prandom_u32_state(rnd);

return x;
}
diff --git a/drivers/gpu/drm/i915/selftests/i915_random.h b/drivers/gpu/drm/i915/selftests/i915_random.h
index 05364eca2..7290a2eaf 100644
--- a/drivers/gpu/drm/i915/selftests/i915_random.h
+++ b/drivers/gpu/drm/i915/selftests/i915_random.h
@@ -40,13 +40,13 @@
struct rnd_state name__ = I915_RND_STATE_INITIALIZER(i915_selftest.random_seed)

#define I915_RND_SUBSTATE(name__, parent__) \
- struct rnd_state name__ = I915_RND_STATE_INITIALIZER(prandom_u32_state(&(parent__)))
+ struct rnd_state name__ = I915_RND_STATE_INITIALIZER(predictable_rng_prandom_u32_state(&(parent__)))

u64 i915_prandom_u64_state(struct rnd_state *rnd);

static inline u32 i915_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state)
{
- return upper_32_bits(mul_u32_u32(prandom_u32_state(state), ep_ro));
+ return upper_32_bits(mul_u32_u32(predictable_rng_prandom_u32_state(state), ep_ro));
}

unsigned int *i915_random_order(unsigned int count,
diff --git a/drivers/gpu/drm/i915/selftests/i915_syncmap.c b/drivers/gpu/drm/i915/selftests/i915_syncmap.c
index 47f4ae18a..c02e55133 100644
--- a/drivers/gpu/drm/i915/selftests/i915_syncmap.c
+++ b/drivers/gpu/drm/i915/selftests/i915_syncmap.c
@@ -223,7 +223,7 @@ static int igt_syncmap_one(void *arg)

for (loop = 0; loop <= max; loop++) {
err = check_one(&sync, context,
- prandom_u32_state(&prng));
+ predictable_rng_prandom_u32_state(&prng));
if (err)
goto out;
}
@@ -575,7 +575,7 @@ static int igt_syncmap_random(void *arg)
u32 last_seqno = seqno;
bool expect;

- seqno = prandom_u32_state(&prng);
+ seqno = predictable_rng_prandom_u32_state(&prng);
expect = seqno_later(last_seqno, seqno);

for (i = 0; i < count; i++) {
diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
index 3b18e5905..2c65795e8 100644
--- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
@@ -758,7 +758,7 @@ static int igt_gpu_write(struct i915_gem_context *ctx,
i = 0;
engines = i915_gem_context_lock_engines(ctx);
do {
- u32 rng = prandom_u32_state(&prng);
+ u32 rng = predictable_rng_prandom_u32_state(&prng);
u32 dword = offset_in_page(rng) / 4;

ce = engines->engines[order[i] % engines->num_engines];
@@ -929,7 +929,7 @@ static int igt_lmem_create_cleared_cpu(void *arg)
goto out_unpin;
}

- val = prandom_u32_state(&prng);
+ val = predictable_rng_prandom_u32_state(&prng);

memset32(vaddr, val, obj->base.size / sizeof(u32));

@@ -972,7 +972,7 @@ static int igt_lmem_write_gpu(void *arg)
goto out_file;
}

- sz = round_up(prandom_u32_state(&prng) % SZ_32M, PAGE_SIZE);
+ sz = round_up(predictable_rng_prandom_u32_state(&prng) % SZ_32M, PAGE_SIZE);

obj = i915_gem_object_create_lmem(i915, sz, 0);
if (IS_ERR(obj)) {
@@ -1046,7 +1046,7 @@ static int igt_lmem_write_cpu(void *arg)

pr_info("%s: using %s\n", __func__, engine->name);

- sz = round_up(prandom_u32_state(&prng) % SZ_32M, PAGE_SIZE);
+ sz = round_up(predictable_rng_prandom_u32_state(&prng) % SZ_32M, PAGE_SIZE);
sz = max_t(u32, 2 * PAGE_SIZE, sz);

obj = i915_gem_object_create_lmem(i915, sz, I915_BO_ALLOC_CONTIGUOUS);
@@ -1115,7 +1115,7 @@ static int igt_lmem_write_cpu(void *arg)
offset = igt_random_offset(&prng, 0, obj->base.size,
size, align);

- val = prandom_u32_state(&prng);
+ val = predictable_rng_prandom_u32_state(&prng);
memset32(vaddr + offset / sizeof(u32), val ^ 0xdeadbeaf,
size / sizeof(u32));

diff --git a/drivers/gpu/drm/i915/selftests/scatterlist.c b/drivers/gpu/drm/i915/selftests/scatterlist.c
index d599186d5..ff86bf468 100644
--- a/drivers/gpu/drm/i915/selftests/scatterlist.c
+++ b/drivers/gpu/drm/i915/selftests/scatterlist.c
@@ -187,7 +187,7 @@ static unsigned int random(unsigned long n,
unsigned long count,
struct rnd_state *rnd)
{
- return 1 + (prandom_u32_state(rnd) % 1024);
+ return 1 + (predictable_rng_prandom_u32_state(rnd) % 1024);
}

static unsigned int random_page_size_pages(unsigned long n,
@@ -201,7 +201,7 @@ static unsigned int random_page_size_pages(unsigned long n,
BIT(21) >> PAGE_SHIFT,
};

- return page_count[(prandom_u32_state(rnd) % 3)];
+ return page_count[(predictable_rng_prandom_u32_state(rnd) % 3)];
}

static inline bool page_contiguous(struct page *first,
diff --git a/drivers/gpu/drm/lib/drm_random.c b/drivers/gpu/drm/lib/drm_random.c
index 31b5a3e21..512455039 100644
--- a/drivers/gpu/drm/lib/drm_random.c
+++ b/drivers/gpu/drm/lib/drm_random.c
@@ -9,7 +9,7 @@

u32 drm_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state)
{
- return upper_32_bits((u64)prandom_u32_state(state) * ep_ro);
+ return upper_32_bits((u64)predictable_rng_prandom_u32_state(state) * ep_ro);
}
EXPORT_SYMBOL(drm_prandom_u32_max_state);

diff --git a/drivers/mtd/tests/oobtest.c b/drivers/mtd/tests/oobtest.c
index 13fed3989..fc248fbdb 100644
--- a/drivers/mtd/tests/oobtest.c
+++ b/drivers/mtd/tests/oobtest.c
@@ -60,7 +60,7 @@ static int write_eraseblock(int ebnum)
int err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;

- prandom_bytes_state(&rnd_state, writebuf, use_len_max * pgcnt);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, use_len_max * pgcnt);
for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
@@ -170,7 +170,7 @@ static int verify_eraseblock(int ebnum)
loff_t addr = (loff_t)ebnum * mtd->erasesize;
size_t bitflips;

- prandom_bytes_state(&rnd_state, writebuf, use_len_max * pgcnt);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, use_len_max * pgcnt);
for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
@@ -268,7 +268,7 @@ static int verify_eraseblock_in_one_go(int ebnum)
size_t bitflips;
int i;

- prandom_bytes_state(&rnd_state, writebuf, len);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, len);
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
@@ -642,7 +642,7 @@ static int __init mtd_oobtest_init(void)
if (bbt[i] || bbt[i + 1])
continue;
addr = (loff_t)(i + 1) * mtd->erasesize - mtd->writesize;
- prandom_bytes_state(&rnd_state, writebuf, sz * cnt);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, sz * cnt);
for (pg = 0; pg < cnt; ++pg) {
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
@@ -673,7 +673,7 @@ static int __init mtd_oobtest_init(void)
for (i = 0; i < ebcnt - 1; ++i) {
if (bbt[i] || bbt[i + 1])
continue;
- prandom_bytes_state(&rnd_state, writebuf, mtd->oobavail * 2);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, mtd->oobavail * 2);
addr = (loff_t)(i + 1) * mtd->erasesize - mtd->writesize;
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
diff --git a/drivers/mtd/tests/pagetest.c b/drivers/mtd/tests/pagetest.c
index 8eb40b6e6..088146869 100644
--- a/drivers/mtd/tests/pagetest.c
+++ b/drivers/mtd/tests/pagetest.c
@@ -42,7 +42,7 @@ static int write_eraseblock(int ebnum)
{
loff_t addr = (loff_t)ebnum * mtd->erasesize;

- prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
cond_resched();
return mtdtest_write(mtd, addr, mtd->erasesize, writebuf);
}
@@ -62,7 +62,7 @@ static int verify_eraseblock(int ebnum)
for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
addrn -= mtd->erasesize;

- prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
for (j = 0; j < pgcnt - 1; ++j, addr += pgsize) {
/* Do a read to set the internal dataRAMs to different data */
err = mtdtest_read(mtd, addr0, bufsize, twopages);
@@ -97,7 +97,7 @@ static int verify_eraseblock(int ebnum)
if (err)
return err;
memcpy(boundary, writebuf + mtd->erasesize - pgsize, pgsize);
- prandom_bytes_state(&rnd_state, boundary + pgsize, pgsize);
+ predictable_rng_prandom_bytes_state(&rnd_state, boundary + pgsize, pgsize);
if (memcmp(twopages, boundary, bufsize)) {
pr_err("error: verify failed at %#llx\n",
(long long)addr);
@@ -210,7 +210,7 @@ static int erasecrosstest(void)
return err;

pr_info("writing 1st page of block %d\n", ebnum);
- prandom_bytes_state(&rnd_state, writebuf, pgsize);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, pgsize);
strcpy(writebuf, "There is no data like this!");
err = mtdtest_write(mtd, addr0, pgsize, writebuf);
if (err)
@@ -235,7 +235,7 @@ static int erasecrosstest(void)
return err;

pr_info("writing 1st page of block %d\n", ebnum);
- prandom_bytes_state(&rnd_state, writebuf, pgsize);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, pgsize);
strcpy(writebuf, "There is no data like this!");
err = mtdtest_write(mtd, addr0, pgsize, writebuf);
if (err)
@@ -284,7 +284,7 @@ static int erasetest(void)
return err;

pr_info("writing 1st page of block %d\n", ebnum);
- prandom_bytes_state(&rnd_state, writebuf, pgsize);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, pgsize);
err = mtdtest_write(mtd, addr0, pgsize, writebuf);
if (err)
return err;
diff --git a/drivers/mtd/tests/subpagetest.c b/drivers/mtd/tests/subpagetest.c
index 05250a080..3d312a51f 100644
--- a/drivers/mtd/tests/subpagetest.c
+++ b/drivers/mtd/tests/subpagetest.c
@@ -46,7 +46,7 @@ static int write_eraseblock(int ebnum)
int err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;

- prandom_bytes_state(&rnd_state, writebuf, subpgsize);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, subpgsize);
err = mtd_write(mtd, addr, subpgsize, &written, writebuf);
if (unlikely(err || written != subpgsize)) {
pr_err("error: write failed at %#llx\n",
@@ -60,7 +60,7 @@ static int write_eraseblock(int ebnum)

addr += subpgsize;

- prandom_bytes_state(&rnd_state, writebuf, subpgsize);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, subpgsize);
err = mtd_write(mtd, addr, subpgsize, &written, writebuf);
if (unlikely(err || written != subpgsize)) {
pr_err("error: write failed at %#llx\n",
@@ -84,7 +84,7 @@ static int write_eraseblock2(int ebnum)
for (k = 1; k < 33; ++k) {
if (addr + (subpgsize * k) > (loff_t)(ebnum + 1) * mtd->erasesize)
break;
- prandom_bytes_state(&rnd_state, writebuf, subpgsize * k);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, subpgsize * k);
err = mtd_write(mtd, addr, subpgsize * k, &written, writebuf);
if (unlikely(err || written != subpgsize * k)) {
pr_err("error: write failed at %#llx\n",
@@ -120,7 +120,7 @@ static int verify_eraseblock(int ebnum)
int err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;

- prandom_bytes_state(&rnd_state, writebuf, subpgsize);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, subpgsize);
clear_data(readbuf, subpgsize);
err = mtd_read(mtd, addr, subpgsize, &read, readbuf);
if (unlikely(err || read != subpgsize)) {
@@ -147,7 +147,7 @@ static int verify_eraseblock(int ebnum)

addr += subpgsize;

- prandom_bytes_state(&rnd_state, writebuf, subpgsize);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, subpgsize);
clear_data(readbuf, subpgsize);
err = mtd_read(mtd, addr, subpgsize, &read, readbuf);
if (unlikely(err || read != subpgsize)) {
@@ -184,7 +184,7 @@ static int verify_eraseblock2(int ebnum)
for (k = 1; k < 33; ++k) {
if (addr + (subpgsize * k) > (loff_t)(ebnum + 1) * mtd->erasesize)
break;
- prandom_bytes_state(&rnd_state, writebuf, subpgsize * k);
+ predictable_rng_prandom_bytes_state(&rnd_state, writebuf, subpgsize * k);
clear_data(readbuf, subpgsize * k);
err = mtd_read(mtd, addr, subpgsize * k, &read, readbuf);
if (unlikely(err || read != subpgsize * k)) {
diff --git a/drivers/scsi/fcoe/fcoe_ctlr.c b/drivers/scsi/fcoe/fcoe_ctlr.c
index ddc048069..e1a0e2c27 100644
--- a/drivers/scsi/fcoe/fcoe_ctlr.c
+++ b/drivers/scsi/fcoe/fcoe_ctlr.c
@@ -2224,7 +2224,7 @@ static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip)
*/
port_id = fip->port_id;
if (fip->probe_tries)
- port_id = prandom_u32_state(&fip->rnd_state) & 0xffff;
+ port_id = predictable_rng_prandom_u32_state(&fip->rnd_state) & 0xffff;
else if (!port_id)
port_id = fip->lp->wwpn & 0xffff;
if (!port_id || port_id == 0xffff)
diff --git a/include/linux/prandom.h b/include/linux/prandom.h
index e0a0759dd..d525ab02e 100644
--- a/include/linux/prandom.h
+++ b/include/linux/prandom.h
@@ -16,8 +16,8 @@ struct rnd_state {
__u32 s1, s2, s3, s4;
};

-u32 prandom_u32_state(struct rnd_state *state);
-void prandom_bytes_state(struct rnd_state *state, void *buf, size_t nbytes);
+u32 predictable_rng_prandom_u32_state(struct rnd_state *state);
+void predictable_rng_prandom_bytes_state(struct rnd_state *state, void *buf, size_t nbytes);
void prandom_seed_full_state(struct rnd_state __percpu *pcpu_state);

#define prandom_init_once(pcpu_state) \
@@ -52,7 +52,7 @@ static inline u32 __seed(u32 x, u32 m)
}

/**
- * prandom_seed_state - set seed for prandom_u32_state().
+ * prandom_seed_state - set seed for predictable_rng_prandom_u32_state().
* @state: pointer to state structure to receive the seed.
* @seed: arbitrary 64-bit value to use as a seed.
*/
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 25a54e045..4cb5421d9 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -2599,7 +2599,7 @@ BPF_CALL_0(bpf_user_rnd_u32)
u32 res;

state = &get_cpu_var(bpf_user_rnd_state);
- res = prandom_u32_state(state);
+ res = predictable_rng_prandom_u32_state(state);
put_cpu_var(bpf_user_rnd_state);

return res;
diff --git a/lib/interval_tree_test.c b/lib/interval_tree_test.c
index f37f4d44f..1a1a89a39 100644
--- a/lib/interval_tree_test.c
+++ b/lib/interval_tree_test.c
@@ -43,8 +43,8 @@ static void init(void)
int i;

for (i = 0; i < nnodes; i++) {
- u32 b = (prandom_u32_state(&rnd) >> 4) % max_endpoint;
- u32 a = (prandom_u32_state(&rnd) >> 4) % b;
+ u32 b = (predictable_rng_prandom_u32_state(&rnd) >> 4) % max_endpoint;
+ u32 a = (predictable_rng_prandom_u32_state(&rnd) >> 4) % b;

nodes[i].start = a;
nodes[i].last = b;
@@ -56,7 +56,7 @@ static void init(void)
* which is pointless.
*/
for (i = 0; i < nsearches; i++)
- queries[i] = (prandom_u32_state(&rnd) >> 4) % max_endpoint;
+ queries[i] = (predictable_rng_prandom_u32_state(&rnd) >> 4) % max_endpoint;
}

static int interval_tree_test_init(void)
diff --git a/lib/random32.c b/lib/random32.c
index 32060b852..3b34ea934 100644
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -43,13 +43,13 @@
#include <asm/unaligned.h>

/**
- * prandom_u32_state - seeded pseudo-random number generator.
+ * predictable_rng_prandom_u32_state - seeded pseudo-random number generator.
* @state: pointer to state structure holding seeded state.
*
* This is used for pseudo-randomness with no outside seeding.
* For more random results, use get_random_u32().
*/
-u32 prandom_u32_state(struct rnd_state *state)
+u32 predictable_rng_prandom_u32_state(struct rnd_state *state)
{
#define TAUSWORTHE(s, a, b, c, d) ((s & c) << d) ^ (((s << a) ^ s) >> b)
state->s1 = TAUSWORTHE(state->s1, 6U, 13U, 4294967294U, 18U);
@@ -59,10 +59,10 @@ u32 prandom_u32_state(struct rnd_state *state)

return (state->s1 ^ state->s2 ^ state->s3 ^ state->s4);
}
-EXPORT_SYMBOL(prandom_u32_state);
+EXPORT_SYMBOL(predictable_rng_prandom_u32_state);

/**
- * prandom_bytes_state - get the requested number of pseudo-random bytes
+ * predictable_rng_prandom_bytes_state - get the requested number of pseudo-random bytes
*
* @state: pointer to state structure holding seeded state.
* @buf: where to copy the pseudo-random bytes to
@@ -71,18 +71,18 @@ EXPORT_SYMBOL(prandom_u32_state);
* This is used for pseudo-randomness with no outside seeding.
* For more random results, use get_random_bytes().
*/
-void prandom_bytes_state(struct rnd_state *state, void *buf, size_t bytes)
+void predictable_rng_prandom_bytes_state(struct rnd_state *state, void *buf, size_t bytes)
{
u8 *ptr = buf;

while (bytes >= sizeof(u32)) {
- put_unaligned(prandom_u32_state(state), (u32 *) ptr);
+ put_unaligned(predictable_rng_prandom_u32_state(state), (u32 *) ptr);
ptr += sizeof(u32);
bytes -= sizeof(u32);
}

if (bytes > 0) {
- u32 rem = prandom_u32_state(state);
+ u32 rem = predictable_rng_prandom_u32_state(state);
do {
*ptr++ = (u8) rem;
bytes--;
@@ -90,21 +90,21 @@ void prandom_bytes_state(struct rnd_state *state, void *buf, size_t bytes)
} while (bytes > 0);
}
}
-EXPORT_SYMBOL(prandom_bytes_state);
+EXPORT_SYMBOL(predictable_rng_prandom_bytes_state);

static void prandom_warmup(struct rnd_state *state)
{
/* Calling RNG ten times to satisfy recurrence condition */
- prandom_u32_state(state);
- prandom_u32_state(state);
- prandom_u32_state(state);
- prandom_u32_state(state);
- prandom_u32_state(state);
- prandom_u32_state(state);
- prandom_u32_state(state);
- prandom_u32_state(state);
- prandom_u32_state(state);
- prandom_u32_state(state);
+ predictable_rng_prandom_u32_state(state);
+ predictable_rng_prandom_u32_state(state);
+ predictable_rng_prandom_u32_state(state);
+ predictable_rng_prandom_u32_state(state);
+ predictable_rng_prandom_u32_state(state);
+ predictable_rng_prandom_u32_state(state);
+ predictable_rng_prandom_u32_state(state);
+ predictable_rng_prandom_u32_state(state);
+ predictable_rng_prandom_u32_state(state);
+ predictable_rng_prandom_u32_state(state);
}

void prandom_seed_full_state(struct rnd_state __percpu *pcpu_state)
@@ -265,7 +265,7 @@ static int __init prandom_state_selftest(void)
prandom_state_selftest_seed(&state, test1[i].seed);
prandom_warmup(&state);

- if (test1[i].result != prandom_u32_state(&state))
+ if (test1[i].result != predictable_rng_prandom_u32_state(&state))
error = true;
}

@@ -281,9 +281,9 @@ static int __init prandom_state_selftest(void)
prandom_warmup(&state);

for (j = 0; j < test2[i].iteration - 1; j++)
- prandom_u32_state(&state);
+ predictable_rng_prandom_u32_state(&state);

- if (test2[i].result != prandom_u32_state(&state))
+ if (test2[i].result != predictable_rng_prandom_u32_state(&state))
errors++;

runs++;
diff --git a/lib/rbtree_test.c b/lib/rbtree_test.c
index 41ae3c757..62dd773c8 100644
--- a/lib/rbtree_test.c
+++ b/lib/rbtree_test.c
@@ -150,8 +150,8 @@ static void init(void)
{
int i;
for (i = 0; i < nnodes; i++) {
- nodes[i].key = prandom_u32_state(&rnd);
- nodes[i].val = prandom_u32_state(&rnd);
+ nodes[i].key = predictable_rng_prandom_u32_state(&rnd);
+ nodes[i].val = predictable_rng_prandom_u32_state(&rnd);
}
}

diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index 582070416..b17e751cc 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -140,7 +140,7 @@ static int bpf_fill_maxinsns3(struct bpf_test *self)
prandom_seed_state(&rnd, 3141592653589793238ULL);

for (i = 0; i < len - 1; i++) {
- __u32 k = prandom_u32_state(&rnd);
+ __u32 k = predictable_rng_prandom_u32_state(&rnd);

insn[i] = __BPF_STMT(BPF_ALU | BPF_ADD | BPF_K, k);
}
diff --git a/lib/test_parman.c b/lib/test_parman.c
index 35e322436..f89b8192c 100644
--- a/lib/test_parman.c
+++ b/lib/test_parman.c
@@ -136,7 +136,7 @@ static void test_parman_rnd_init(struct test_parman *test_parman)

static u32 test_parman_rnd_get(struct test_parman *test_parman)
{
- return prandom_u32_state(&test_parman->rnd);
+ return predictable_rng_prandom_u32_state(&test_parman->rnd);
}

static unsigned long test_parman_priority_gen(struct test_parman *test_parman)
diff --git a/lib/test_scanf.c b/lib/test_scanf.c
index b620cf7de..a2de3dee2 100644
--- a/lib/test_scanf.c
+++ b/lib/test_scanf.c
@@ -269,16 +269,16 @@ static void __init numbers_simple(void)
*/
static u32 __init next_test_random(u32 max_bits)
{
- u32 n_bits = hweight32(prandom_u32_state(&rnd_state)) % (max_bits + 1);
+ u32 n_bits = hweight32(predictable_rng_prandom_u32_state(&rnd_state)) % (max_bits + 1);

- return prandom_u32_state(&rnd_state) & GENMASK(n_bits, 0);
+ return predictable_rng_prandom_u32_state(&rnd_state) & GENMASK(n_bits, 0);
}

static unsigned long long __init next_test_random_ull(void)
{
- u32 rand1 = prandom_u32_state(&rnd_state);
+ u32 rand1 = predictable_rng_prandom_u32_state(&rnd_state);
u32 n_bits = (hweight32(rand1) * 3) % 64;
- u64 val = (u64)prandom_u32_state(&rnd_state) * rand1;
+ u64 val = (u64)predictable_rng_prandom_u32_state(&rnd_state) * rand1;

return val & GENMASK_ULL(n_bits, 0);
}
diff --git a/mm/slab.c b/mm/slab.c
index 59c8e28f7..ff71c5757 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2447,7 +2447,7 @@ static bool shuffle_freelist(struct kmem_cache *cachep, struct slab *slab)

/* Fisher-Yates shuffle */
for (i = count - 1; i > 0; i--) {
- rand = prandom_u32_state(&state.rnd_state);
+ rand = predictable_rng_prandom_u32_state(&state.rnd_state);
rand %= (i + 1);
swap_free_obj(slab, i, rand);
}
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 0042fb273..deb764785 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1141,7 +1141,7 @@ static void freelist_randomize(struct rnd_state *state, unsigned int *list,

/* Fisher-Yates shuffle */
for (i = count - 1; i > 0; i--) {
- rand = prandom_u32_state(state);
+ rand = predictable_rng_prandom_u32_state(state);
rand %= (i + 1);
swap(list[i], list[rand]);
}
--
2.38.0