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Accepting request 595496 from home:jdelvare:branches:Base:System

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Fix corruption of "grub2-install --help" and grub2-install manual page (bsc#1086670)

OBS-URL: https://build.opensuse.org/request/show/595496
OBS-URL: https://build.opensuse.org/package/show/Base:System/grub2?expand=0&rev=297
This commit is contained in:
Michael Chang 2018-04-12 08:40:39 +00:00 committed by Git OBS Bridge
parent a0de87febe
commit f3d710cae6
3 changed files with 79 additions and 0 deletions
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7
grub2.changes
View File

@ -1,3 +1,10 @@
-------------------------------------------------------------------
Tue Apr 10 15:12:28 CEST 2018 - jdelvare@suse.de
- Fix corruption of "grub2-install --help" and grub2-install manual
page (bsc#1086670)
* unix-exec-avoid-atexit-handlers-when-child-exits.patch
-------------------------------------------------------------------
Mon Apr 2 08:30:05 UTC 2018 - mchang@suse.com

2
grub2.spec
View File

@ -216,6 +216,7 @@ Patch84: grub2-s390x-09-improve-zipl-setup.patch
Patch85: grub2-getroot-scan-disk-pv.patch
Patch86: 0001-Fix-packed-not-aligned-error-on-GCC-8.patch
Patch87: 0001-Fix-PCIe-LER-when-GRUB2-accesses-non-enabled-MMIO-da.patch
Patch88: unix-exec-avoid-atexit-handlers-when-child-exits.patch
# Btrfs snapshot booting related patches
Patch101: grub2-btrfs-01-add-ability-to-boot-from-subvolumes.patch
Patch102: grub2-btrfs-02-export-subvolume-envvars.patch
@ -497,6 +498,7 @@ swap partition while in resuming
%patch85 -p1
%patch86 -p1
%patch87 -p1
%patch88 -p1
%patch101 -p1
%patch102 -p1
%patch103 -p1

70
unix-exec-avoid-atexit-handlers-when-child-exits.patch Normal file
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@ -0,0 +1,70 @@
From: Patrick Steinhardt <ps@pks.im>
Date: Mon, 28 Aug 2017 20:57:19 +0200
Subject: unix exec: avoid atexit handlers when child exits
Git-commit: e75cf4a58b5eaf482804e5e1b2cc7d4399df350e
Patch-mainline: Yes, but not released yet
References: bsc#1086670
The `grub_util_exec_redirect_all` helper function can be used to
spawn an executable and redirect its output to some files. After calling
`fork()`, the parent will wait for the child to terminate with
`waitpid()` while the child prepares its file descriptors, environment
and finally calls `execvp()`. If something in the children's setup
fails, it will stop by calling `exit(127)`.
Calling `exit()` will cause any function registered via `atexit()` to be
executed, which is usually the wrong thing to do in a child. And
actually, one can easily observe faulty behaviour on musl-based systems
without modprobe(8) installed: executing `grub-install --help` will call
`grub_util_exec_redirect_all` with "modprobe", which obviously fails if
modprobe(8) is not installed. Due to the child now exiting and invoking
the `atexit()` handlers, it will clean up some data structures of the
parent and cause it to be deadlocked in the `waitpid()` syscall.
The issue can easily be fixed by calling `_exit(127)` instead, which is
especially designed to be called when the atexit-handlers should not be
executed.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
grub-core/osdep/unix/exec.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/grub-core/osdep/unix/exec.c
+++ b/grub-core/osdep/unix/exec.c
@@ -99,7 +99,7 @@ grub_util_exec_redirect_all (const char
{
fd = open (stdin_file, O_RDONLY);
if (fd < 0)
- exit (127);
+ _exit (127);
dup2 (fd, STDIN_FILENO);
close (fd);
}
@@ -108,7 +108,7 @@ grub_util_exec_redirect_all (const char
{
fd = open (stdout_file, O_WRONLY | O_CREAT, 0700);
if (fd < 0)
- exit (127);
+ _exit (127);
dup2 (fd, STDOUT_FILENO);
close (fd);
}
@@ -117,7 +117,7 @@ grub_util_exec_redirect_all (const char
{
fd = open (stderr_file, O_WRONLY | O_CREAT, 0700);
if (fd < 0)
- exit (127);
+ _exit (127);
dup2 (fd, STDERR_FILENO);
close (fd);
}
@@ -126,7 +126,7 @@ grub_util_exec_redirect_all (const char
setenv ("LC_ALL", "C", 1);
execvp ((char *) argv[0], (char **) argv);
- exit (127);
+ _exit (127);
}
waitpid (pid, &status, 0);
if (!WIFEXITED (status))