linux-kernel - [PATCH] arm64: take SHN_LIVEPATCH syms into account when calculating plt_max

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Message-ID: <20160713001113.GA30925@packer-debian-8-amd64.digitalocean.com>
Date:	Tue, 12 Jul 2016 20:11:14 -0400
From:	Jessica Yu <jeyu@...hat.com>
To:	Miroslav Benes <mbenes@...e.cz>
Cc:	Torsten Duwe <duwe@....de>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>, takahiro.akashi@...aro.org,
	Jungseok Lee <jungseoklee85@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Li Bin <huawei.libin@...wei.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Christopher Li <sparse@...isli.org>,
	Jiri Kosina <jikos@...nel.org>, andrew.wafaa@....com,
	linux-arm-kernel@...ts.infradead.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	live-patching@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-sparse@...r.kernel.org
Subject: [PATCH] arm64: take SHN_LIVEPATCH syms into account when calculating
 plt_max_entries

SHN_LIVEPATCH symbols are technically a subset of SHN_UNDEF/undefined
symbols, except that their addresses are resolved by livepatch at runtime.
Therefore, when calculating the upper-bound for the number of plt entries
to allocate, make sure to take livepatch symbols into account as well.

Signed-off-by: Jessica Yu <jeyu@...hat.com>
---
 arch/arm64/kernel/module-plts.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/module-plts.c b/arch/arm64/kernel/module-plts.c
index 1ce90d8..1e95dc1 100644
--- a/arch/arm64/kernel/module-plts.c
+++ b/arch/arm64/kernel/module-plts.c
@@ -122,7 +122,8 @@ static unsigned int count_plts(Elf64_Sym *syms, Elf64_Rela *rela, int num)
                         * as well, so modules can never grow beyond that limit.
                         */
                        s = syms + ELF64_R_SYM(rela[i].r_info);
-                       if (s->st_shndx != SHN_UNDEF)
+                       if (s->st_shndx != SHN_UNDEF &&
+                           s->st_shndx != SHN_LIVEPATCH)
                                break;

                        /*
-- 
2.5.5