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fs: warn about impending deprecation of mandatory locks

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[ Upstream commit fdd92b64d15bc4aec973caa25899afd782402e68 ]

We've had CONFIG_MANDATORY_FILE_LOCKING since 2015 and a lot of distros
have disabled it. Warn the stragglers that still use "-o mand" that
we'll be dropping support for that mount option.

Cc: stable@vger.kernel.org
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jeff Layton 2021-08-20 09:29:50 -04:00 committed by Sasha Levin
parent 8132fc2bf4
commit 0d5fcfc640
1 changed files with 5 additions and 1 deletions
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6
fs/namespace.c
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@ -1697,8 +1697,12 @@ static inline bool may_mount(void)
} }
#ifdef CONFIG_MANDATORY_FILE_LOCKING #ifdef CONFIG_MANDATORY_FILE_LOCKING
static inline bool may_mandlock(void) static bool may_mandlock(void)
{ {
pr_warn_once("======================================================\n"
"WARNING: the mand mount option is being deprecated and\n"
" will be removed in v5.15!\n"
"======================================================\n");
return capable(CAP_SYS_ADMIN); return capable(CAP_SYS_ADMIN);
} }
#else #else