71 lines
2.4 KiB
Diff
71 lines
2.4 KiB
Diff
From 23aaa44614a02d2184951142125cb55b36cef40a Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Niklas=20Hamb=C3=BCchen?= <mail@nh2.me>
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Date: Mon, 29 Apr 2019 10:22:26 +0200
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Subject: [PATCH 04/20] x86: Check /proc/mounts before mtab for mounts
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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https://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git/commit/?id=23aaa44614a02d2184951142125cb55b36cef40a
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In many situations, especially on read-only file systems
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and initial ramdisks (intramfs/initrd), /etc/mtab does not exist.
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Before this commit, kexec would fail to read mounts on such systems
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in `find_mnt_by_fsname()`, such that `get_bootparam()` would not
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`boot_params/data`, which would then lead to e.g. `setup_efi_data()`
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not being called in `setup_efi_info()`.
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As a result, kexec'ed kernels would not obtain EFI data,
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subsequentially lack an `ACPI RSDP` entry, emitting:
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ACPI BIOS Error (bug): A valid RSDP was not found (20180810/tbxfroot-210)
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and thus fail to turn off the machine on poweroff, instead printing only:
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reboot: System halted
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This problem had to be worked around by passing `acpi_rsdp=` manually
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before. This commit obviates this workaround.
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See also:
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* https://github.com/coreos/bugs/issues/167#issuecomment-487320879
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* http://lists.infradead.org/pipermail/kexec/2012-October/006924.html
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Signed-off-by: Niklas Hambüchen <mail@nh2.me>
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Signed-off-by: Simon Horman <horms@verge.net.au>
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---
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kexec/arch/i386/x86-linux-setup.c | 8 ++++++--
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1 file changed, 6 insertions(+), 2 deletions(-)
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diff --git a/kexec/arch/i386/x86-linux-setup.c b/kexec/arch/i386/x86-linux-setup.c
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index 8fad115..74fb0c4 100644
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--- a/kexec/arch/i386/x86-linux-setup.c
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+++ b/kexec/arch/i386/x86-linux-setup.c
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@@ -432,7 +432,7 @@ out:
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/*
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* This really only makes sense for virtual filesystems that are only expected
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* to be mounted once (sysfs, debugsfs, proc), as it will return the first
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- * instance listed in mtab.
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+ * instance listed in /proc/mounts, falling back to mtab if absent.
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*/
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char *find_mnt_by_fsname(char *fsname)
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{
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@@ -440,7 +440,11 @@ char *find_mnt_by_fsname(char *fsname)
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struct mntent *mnt;
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char *mntdir;
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- mtab = setmntent("/etc/mtab", "r");
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+ mtab = setmntent("/proc/mounts", "r");
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+ if (!mtab) {
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+ // Fall back to mtab
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+ mtab = setmntent("/etc/mtab", "r");
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+ }
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if (!mtab)
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return NULL;
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for(mnt = getmntent(mtab); mnt; mnt = getmntent(mtab)) {
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--
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1.8.3.1
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