From 3a341cb3a2c2879732bc9cf006caa6a087b82241 Mon Sep 17 00:00:00 2001 From: Kaitao Cheng Date: Thu, 18 Jun 2026 19:06:40 +0800 Subject: lib/vsprintf: Make no_hash_pointers take effect early 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 Reviewed-by: Petr Mladek Link: https://patch.msgid.link/20260618110640.82749-1-kaitao.cheng@linux.dev Signed-off-by: Petr Mladek --- lib/vsprintf.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'lib') diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 2bc6ef483576..e285e8bc4712 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -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; -- cgit v1.2.3