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lib/vsprintf: Make no_hash_pointers take effect early

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The no_hash_pointers boot parameter is now handled as an alias for
hash_pointers=never. However, hash_pointers=never only records the
selected mode during early parameter parsing, and no_hash_pointers is
not updated until hash_pointers_finalize() runs later from SLUB init.

This leaves a window during very early boot where %p output is still
hashed even though the user explicitly requested unhashed pointers with
no_hash_pointers or hash_pointers=never.

Set no_hash_pointers as soon as the "never" mode is parsed. The later
hash_pointers_finalize() call still keeps the final policy decision in
one place, but explicit requests to disable pointer hashing now take
effect for early boot users too.

Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://patch.msgid.link/20260618110640.82749-1-kaitao.cheng@linux.dev
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Kaitao Cheng
2026-06-18 19:06:40 +08:00
committed by Petr Mladek
parent 0db1496dcb
commit 3a341cb3a2
1 changed files with 4 additions and 0 deletions
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4
lib/vsprintf.c
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@@ -2360,6 +2360,9 @@ void __init hash_pointers_finalize(bool slub_debug)
static int __init hash_pointers_mode_parse(char *str)
{
/* Avoid stale no_hash_pointers state when hash_pointers overrides it */
no_hash_pointers = false;
if (!str) {
pr_warn("Hash pointers mode empty; falling back to auto.\n");
hash_pointers_mode = HASH_PTR_AUTO;
@@ -2369,6 +2372,7 @@ static int __init hash_pointers_mode_parse(char *str)
} else if (strcmp(str, "never") == 0) {
pr_info("Hash pointers mode set to never.\n");
hash_pointers_mode = HASH_PTR_NEVER;
no_hash_pointers = true;
} else if (strcmp(str, "always") == 0) {
pr_info("Hash pointers mode set to always.\n");
hash_pointers_mode = HASH_PTR_ALWAYS;