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Accepting request 784674 from Kernel:kdump

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- kexec-tools-reset-getopt-before-falling-back-to-legacy.patch:
  Reset getopt before falling back to legacy syscall (bsc#1166105).
- kexec-tools-fix-kexec_file_load-error-handling.patch: Fix the
  error handling if kexec_file_load() fails (bsc#1166105).

OBS-URL: https://build.opensuse.org/request/show/784674
OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/kexec-tools?expand=0&rev=134
This commit is contained in:
Dominique Leuenberger 2020-03-16 09:17:11 +00:00 committed by Git OBS Bridge
commit a40f6346d2
4 changed files with 300 additions and 0 deletions
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230
kexec-tools-fix-kexec_file_load-error-handling.patch Normal file
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@ -0,0 +1,230 @@
From 0ec1fd23847ba103f967e3377e2a1b13712cff6e Mon Sep 17 00:00:00 2001
From: Petr Tesarik <ptesarik@suse.com>
Date: Thu, 12 Mar 2020 20:12:12 +0100
Upstream: not yet, patch sent 2020-03-12
Subject: Fix kexec_file_load(2) error handling
References: bsc#1166105
The handling of kexec_file_load() error conditions needs some
improvement.
First, on failure, the system call itself returns -1 and sets
errno. It is wrong to check the return value itself.
Second, do_kexec_file_load() mixes different types of error
codes (-1, return value of a load method, negative kernel error
number). Let it always return one of the reason codes defined in
kexec/kexec.h.
Third, the caller of do_kexec_file_load() cannot know what exactly
failed inside that function, so it should not check errno directly.
All it needs to know is whether it makes sense to fall back to the
other syscall. Add an error code for that purpose (EFALLBACK), and
let do_kexec_file_load() decide.
Fourth, do_kexec_file_load() should not print any error message if
it returns EFALLBACK, because the fallback syscall may succeed
later, and the user is confused whether the command failed, or not.
Move the error message towards the end of main().
Signed-off-by: Petr Tesarik <ptesarik@suse.com>
---
kexec/kexec.c | 114 ++++++++++++++++++++++++++++++----------------------------
kexec/kexec.h | 1 +
2 files changed, 61 insertions(+), 54 deletions(-)
diff --git a/kexec/kexec.c b/kexec/kexec.c
index bc6ab3d..33c1b4b 100644
--- a/kexec/kexec.c
+++ b/kexec/kexec.c
@@ -836,11 +836,21 @@ static int kexec_file_unload(unsigned long kexec_file_flags)
{
int ret = 0;
+ if (!is_kexec_file_load_implemented())
+ return EFALLBACK;
+
ret = kexec_file_load(-1, -1, 0, NULL, kexec_file_flags);
if (ret != 0) {
- /* The unload failed, print some debugging information */
- fprintf(stderr, "kexec_file_load(unload) failed\n: %s\n",
- strerror(errno));
+ if (errno == ENOSYS) {
+ ret = EFALLBACK;
+ } else {
+ /*
+ * The unload failed, print some debugging
+ * information */
+ fprintf(stderr, "kexec_file_load(unload) failed: %s\n",
+ strerror(errno));
+ ret = EFAILED;
+ }
}
return ret;
}
@@ -1182,15 +1192,13 @@ static int do_kexec_file_load(int fileind, int argc, char **argv,
info.file_mode = 1;
info.initrd_fd = -1;
- if (!is_kexec_file_load_implemented()) {
- fprintf(stderr, "syscall kexec_file_load not available.\n");
- return -ENOSYS;
- }
+ if (!is_kexec_file_load_implemented())
+ return EFALLBACK;
if (argc - fileind <= 0) {
fprintf(stderr, "No kernel specified\n");
usage();
- return -1;
+ return EFAILED;
}
kernel = argv[fileind];
@@ -1199,7 +1207,7 @@ static int do_kexec_file_load(int fileind, int argc, char **argv,
if (kernel_fd == -1) {
fprintf(stderr, "Failed to open file %s:%s\n", kernel,
strerror(errno));
- return -1;
+ return EFAILED;
}
/* slurp in the input kernel */
@@ -1225,7 +1233,7 @@ static int do_kexec_file_load(int fileind, int argc, char **argv,
if (i == file_types) {
fprintf(stderr, "Cannot determine the file type " "of %s\n",
kernel);
- return -1;
+ return EFAILED;
}
ret = file_type[i].load(argc, argv, kernel_buf, kernel_size, &info);
@@ -1243,9 +1251,43 @@ static int do_kexec_file_load(int fileind, int argc, char **argv,
ret = kexec_file_load(kernel_fd, info.initrd_fd, info.command_line_len,
info.command_line, info.kexec_flags);
- if (ret != 0)
- fprintf(stderr, "kexec_file_load failed: %s\n",
- strerror(errno));
+ if (ret != 0) {
+ switch (errno) {
+ /*
+ * Something failed with signature verification.
+ * Reject the image.
+ */
+ case ELIBBAD:
+ case EKEYREJECTED:
+ case ENOPKG:
+ case ENOKEY:
+ case EBADMSG:
+ case EMSGSIZE:
+ /* Reject by default. */
+ default:
+ ret = EFAILED;
+ break;
+
+ /* Not implemented. */
+ case ENOSYS:
+ /*
+ * Parsing image or other options failed
+ * The image may be invalid or image
+ * type may not supported by kernel so
+ * retry parsing in kexec-tools.
+ */
+ case EINVAL:
+ case ENOEXEC:
+ /*
+ * ENOTSUP can be unsupported image
+ * type or unsupported PE signature
+ * wrapper type, duh.
+ */
+ case ENOTSUP:
+ ret = EFALLBACK;
+ break;
+ }
+ }
close(kernel_fd);
return ret;
@@ -1496,7 +1538,7 @@ int main(int argc, char *argv[])
if (do_unload) {
if (do_kexec_file_syscall) {
result = kexec_file_unload(kexec_file_flags);
- if ((result == -ENOSYS) && do_kexec_fallback)
+ if (result == EFALLBACK && do_kexec_fallback)
do_kexec_file_syscall = 0;
}
if (!do_kexec_file_syscall)
@@ -1506,46 +1548,8 @@ int main(int argc, char *argv[])
if (do_kexec_file_syscall) {
result = do_kexec_file_load(fileind, argc, argv,
kexec_file_flags);
- if (do_kexec_fallback) switch (result) {
- /*
- * Something failed with signature verification.
- * Reject the image.
- */
- case -ELIBBAD:
- case -EKEYREJECTED:
- case -ENOPKG:
- case -ENOKEY:
- case -EBADMSG:
- case -EMSGSIZE:
- /*
- * By default reject or do nothing if
- * succeded
- */
- default: break;
- case -ENOSYS: /* not implemented */
- /*
- * Parsing image or other options failed
- * The image may be invalid or image
- * type may not supported by kernel so
- * retry parsing in kexec-tools.
- */
- case -EINVAL:
- case -ENOEXEC:
- /*
- * ENOTSUP can be unsupported image
- * type or unsupported PE signature
- * wrapper type, duh
- *
- * The kernel sometimes wrongly
- * returns ENOTSUPP (524) - ignore
- * that. It is not supposed to be seen
- * by userspace so seeing it is a
- * kernel bug
- */
- case -ENOTSUP:
- do_kexec_file_syscall = 0;
- break;
- }
+ if (result == EFALLBACK && do_kexec_fallback)
+ do_kexec_file_syscall = 0;
}
if (!do_kexec_file_syscall)
result = my_load(type, fileind, argc, argv,
@@ -1570,6 +1574,8 @@ int main(int argc, char *argv[])
if ((result == 0) && do_load_jump_back_helper) {
result = my_load_jump_back_helper(kexec_flags, entry);
}
+ if (result == EFALLBACK)
+ fputs("syscall kexec_file_load not available.\n", stderr);
fflush(stdout);
fflush(stderr);
diff --git a/kexec/kexec.h b/kexec/kexec.h
index a97b9ce..28fd129 100644
--- a/kexec/kexec.h
+++ b/kexec/kexec.h
@@ -63,6 +63,7 @@
*/
#define EFAILED -1 /* default error code */
#define ENOCRASHKERNEL -2 /* no memory reserved for crashkernel */
+#define EFALLBACK -3 /* fallback to kexec_load(2) may work */
/*
* This function doesn't actually exist. The idea is that when someone
--
2.16.4

54
kexec-tools-reset-getopt-before-falling-back-to-legacy.patch Normal file
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@ -0,0 +1,54 @@
From dadafc4664c7b78ea1561ccca33986c9639106ec Mon Sep 17 00:00:00 2001
From: Petr Tesarik <ptesarik@suse.com>
Date: Fri, 13 Mar 2020 14:54:00 +0100
Upstream: not yet, patch sent 2020-03-13
Subject: Reset getopt before falling back to legacy syscall
References: bsc#1166105
The modules may need to parse the arguments again after
kexec_file_load(2) failed, but getopt is not reset.
This change fixes the --initrd option on s390x. Without this patch,
it will fail to load the initrd on kernels that do not implement
kexec_file_load(2).
Signed-off-by: Petr Tesarik <ptesarik@suse.com>
---
kexec/kexec.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/kexec/kexec.c b/kexec/kexec.c
index 33c1b4b..6601f1f 100644
--- a/kexec/kexec.c
+++ b/kexec/kexec.c
@@ -1538,8 +1538,12 @@ int main(int argc, char *argv[])
if (do_unload) {
if (do_kexec_file_syscall) {
result = kexec_file_unload(kexec_file_flags);
- if (result == EFALLBACK && do_kexec_fallback)
+ if (result == EFALLBACK && do_kexec_fallback) {
+ /* Reset getopt for fallback */
+ opterr = 1;
+ optind = 1;
do_kexec_file_syscall = 0;
+ }
}
if (!do_kexec_file_syscall)
result = k_unload(kexec_flags);
@@ -1548,8 +1552,12 @@ int main(int argc, char *argv[])
if (do_kexec_file_syscall) {
result = do_kexec_file_load(fileind, argc, argv,
kexec_file_flags);
- if (result == EFALLBACK && do_kexec_fallback)
+ if (result == EFALLBACK && do_kexec_fallback) {
+ /* Reset getopt for fallback */
+ opterr = 1;
+ optind = 1;
do_kexec_file_syscall = 0;
+ }
}
if (!do_kexec_file_syscall)
result = my_load(type, fileind, argc, argv,
--
2.16.4

12
kexec-tools.changes
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@ -1,3 +1,15 @@
-------------------------------------------------------------------
Fri Mar 13 14:11:55 UTC 2020 - Petr Tesařík <ptesarik@suse.com>
- kexec-tools-reset-getopt-before-falling-back-to-legacy.patch:
Reset getopt before falling back to legacy syscall (bsc#1166105).
-------------------------------------------------------------------
Fri Mar 13 08:37:58 UTC 2020 - Petr Tesařík <ptesarik@suse.com>
- kexec-tools-fix-kexec_file_load-error-handling.patch: Fix the
error handling if kexec_file_load() fails (bsc#1166105).
-------------------------------------------------------------------
Wed Jan 29 07:35:18 UTC 2020 - Petr Tesařík <ptesarik@suse.com>

4
kexec-tools.spec
View File

@ -36,6 +36,8 @@ Patch7: %{name}-arm64-kdump-deal-with-resource-entries-in-proc-iomem.pat
Patch8: %{name}-build-multiboot2-for-i386.patch
Patch9: %{name}-video-capability.patch
Patch10: %{name}-SYS_getrandom.patch
Patch11: %{name}-fix-kexec_file_load-error-handling.patch
Patch12: %{name}-reset-getopt-before-falling-back-to-legacy.patch
BuildRequires: autoconf
BuildRequires: automake
BuildRequires: systemd-rpm-macros
@ -68,6 +70,8 @@ the loaded kernel after it panics.
%patch8 -p1
%patch9 -p1
%patch10 -p1
%patch11 -p1
%patch12 -p1
%build
autoreconf -fvi