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!24 master: fix shim occasionally crashes in _relocate() on AArch64

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From: @hugel 
Reviewed-by: @zhujianwei001 
Signed-off-by: @zhujianwei001
This commit is contained in:
openeuler-ci-bot 2022-07-05 06:37:22 +00:00 committed by Gitee
commit 44b407b974
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GPG Key ID: 173E9B9CA92EEF8F
5 changed files with 630 additions and 1 deletions
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135
backport-arm-aa64-fix-the-size-of-.rela-sections.patch Normal file
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@ -0,0 +1,135 @@
From 34e3ef205c5d65139eacba8891fa773c03174679 Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Wed, 16 Jun 2021 16:13:32 +0800
Subject: [PATCH] arm/aa64: fix the size of .rela* sections
The previous commit(*) merged .rel* and .dyn* into .rodata, and this
made ld to generate the wrong size for .rela* sections that covered
other unrelated sections. When the EFI image was loaded, _relocate()
went through the unexpected data and may cause unexpected crash.
This commit moves .rel* and .dyn* out of .rodata in the ld script but
also moves the related variables, such as _evrodata, _rodata_size,
and _rodata_vsize, to the end of the new .dyn section, so that the
crafted pe-coff section header for .rodata still covers our new
.rela and .dyn sections.
(*) 212ba30544f ("arm/aa64 targets: put .rel* and .dyn* in .rodata")
Fix issue: https://github.com/rhboot/shim/issues/371
Signed-off-by: Gary Lin <glin@suse.com>
---
Makefile | 4 ++--
elf_aarch64_efi.lds | 24 ++++++++++++++++--------
elf_arm_efi.lds | 24 ++++++++++++++++--------
3 files changed, 34 insertions(+), 18 deletions(-)
diff --git a/Makefile b/Makefile
index 050c921..45db2b5 100644
--- a/Makefile
+++ b/Makefile
@@ -247,7 +247,7 @@ ifneq ($(OBJCOPY_GTE224),1)
endif
$(OBJCOPY) -D -j .text -j .sdata -j .data -j .data.ident \
-j .dynamic -j .rodata -j .rel* \
- -j .rela* -j .reloc -j .eh_frame \
+ -j .rela* -j .dyn -j .reloc -j .eh_frame \
-j .vendor_cert -j .sbat \
$(FORMAT) $< $@
# I am tired of wasting my time fighting binutils timestamp code.
@@ -263,7 +263,7 @@ ifneq ($(OBJCOPY_GTE224),1)
endif
$(OBJCOPY) -D -j .text -j .sdata -j .data \
-j .dynamic -j .rodata -j .rel* \
- -j .rela* -j .reloc -j .eh_frame -j .sbat \
+ -j .rela* -j .dyn -j .reloc -j .eh_frame -j .sbat \
-j .debug_info -j .debug_abbrev -j .debug_aranges \
-j .debug_line -j .debug_str -j .debug_ranges \
-j .note.gnu.build-id \
diff --git a/elf_aarch64_efi.lds b/elf_aarch64_efi.lds
index 353b24a..42825fd 100644
--- a/elf_aarch64_efi.lds
+++ b/elf_aarch64_efi.lds
@@ -70,21 +70,29 @@ SECTIONS
.rodata :
{
_rodata = .;
- *(.rela.dyn)
- *(.rela.plt)
- *(.rela.got)
- *(.rela.data)
- *(.rela.data*)
-
*(.rodata*)
*(.srodata)
- *(.dynsym)
- *(.dynstr)
. = ALIGN(16);
*(.note.gnu.build-id)
. = ALIGN(4096);
*(.vendor_cert)
*(.data.ident)
+ . = ALIGN(4096);
+ }
+ . = ALIGN(4096);
+ .rela :
+ {
+ *(.rela.dyn)
+ *(.rela.plt)
+ *(.rela.got)
+ *(.rela.data)
+ *(.rela.data*)
+ }
+ . = ALIGN(4096);
+ .dyn :
+ {
+ *(.dynsym)
+ *(.dynstr)
_evrodata = .;
. = ALIGN(4096);
}
diff --git a/elf_arm_efi.lds b/elf_arm_efi.lds
index e4e29bd..5334621 100644
--- a/elf_arm_efi.lds
+++ b/elf_arm_efi.lds
@@ -70,21 +70,29 @@ SECTIONS
.rodata :
{
_rodata = .;
- *(.rel.dyn)
- *(.rel.plt)
- *(.rel.got)
- *(.rel.data)
- *(.rel.data*)
-
*(.rodata*)
*(.srodata)
- *(.dynsym)
- *(.dynstr)
. = ALIGN(16);
*(.note.gnu.build-id)
. = ALIGN(4096);
*(.vendor_cert)
*(.data.ident)
+ . = ALIGN(4096);
+ }
+ . = ALIGN(4096);
+ .rela :
+ {
+ *(.rela.dyn)
+ *(.rela.plt)
+ *(.rela.got)
+ *(.rela.data)
+ *(.rela.data*)
+ }
+ . = ALIGN(4096);
+ .dyn :
+ {
+ *(.dynsym)
+ *(.dynstr)
_evrodata = .;
. = ALIGN(4096);
}
--
2.27.0

41
backport-mok-delete-the-existing-RT-variables-only-when-only_.patch Normal file
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@ -0,0 +1,41 @@
From b1fead0f7c9a09634057317a7bd2a5c94258e5df Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Wed, 30 Jun 2021 16:34:51 +0800
Subject: [PATCH] mok: delete the existing RT variables only when
only_first=TRUE
For the firmware without the variable writing issues, MOK variables are
mirrored when only_first=TRUE. However, LibDeleteVariable() was called
in maybe_mirror_one_mok_variable() when only_first=FALSE, and this
could delete MOK variables that were just mirrored in the first round.
This bug was hidden since LibDeleteVariable() deletes BS+RT+NV variables
while we mirror MOK variables as BS+RT, and the firmware refused to
delete the mirrored MOK variable due to mismatching attributes. However,
some firmwares, such as VMWare, didn't enforce the attribute check and
just deleted the variables with matched name and GUID. In such system,
MokListRT was always removed before it reached OS.
Fixes: https://github.com/rhboot/shim/issues/386
Signed-off-by: Gary Lin <glin@suse.com>
---
mok.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mok.c b/mok.c
index 454672b..84e51f3 100644
--- a/mok.c
+++ b/mok.c
@@ -868,7 +868,7 @@ maybe_mirror_one_mok_variable(struct mok_state_variable *v,
BOOLEAN present = FALSE;
if (v->rtname) {
- if (!only_first && (v->flags & MOK_MIRROR_DELETE_FIRST)) {
+ if (only_first && (v->flags & MOK_MIRROR_DELETE_FIRST)) {
dprint(L"deleting \"%s\"\n", v->rtname);
efi_status = LibDeleteVariable(v->rtname, v->guid);
dprint(L"LibDeleteVariable(\"%s\",...) => %r\n", v->rtname, efi_status);
--
2.27.0

43
backport-mok-relax-the-maximum-variable-size-check.patch Normal file
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@ -0,0 +1,43 @@
From 3f327f546c219634b24cfd9abe9ec987bbb6ad14 Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Wed, 5 May 2021 11:25:07 +0800
Subject: [PATCH] mok: relax the maximum variable size check
Some UEFI environment such as u-boot doesn't implement
QueryVariableInfo(), so we couldn't rely on the function to estimate the
available space for RT variables. All we can do is to call SetVariable()
directly and check the return value of SetVariable().
Signed-off-by: Gary Lin <glin@suse.com>
---
mok.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/mok.c b/mok.c
index db18093..454672b 100644
--- a/mok.c
+++ b/mok.c
@@ -364,13 +364,18 @@ mirror_mok_db(CHAR16 *name, CHAR8 *name8, EFI_GUID *guid, UINT32 attrs,
SIZE_T max_var_sz;
efi_status = get_max_var_sz(attrs, &max_var_sz);
- if (EFI_ERROR(efi_status)) {
+ if (EFI_ERROR(efi_status) && efi_status != EFI_UNSUPPORTED) {
LogError(L"Could not get maximum variable size: %r",
efi_status);
return efi_status;
}
- if (FullDataSize <= max_var_sz) {
+ /* Some UEFI environment such as u-boot doesn't implement
+ * QueryVariableInfo() and we will only get EFI_UNSUPPORTED when
+ * querying the available space. In this case, we just mirror
+ * the variable directly. */
+ if (FullDataSize <= max_var_sz || efi_status == EFI_UNSUPPORTED) {
+ efi_status = EFI_SUCCESS;
if (only_first)
efi_status = SetVariable(name, guid, attrs,
FullDataSize, FullData);
--
2.27.0

402
backport-shim-another-attempt-to-fix-load-options-handling.patch Normal file
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@ -0,0 +1,402 @@
From 4d64389c6c941d21548b06423b8131c872e3c3c7 Mon Sep 17 00:00:00 2001
From: Chris Coulson <chris.coulson@canonical.com>
Date: Mon, 7 Jun 2021 16:34:18 +0100
Subject: [PATCH] shim: another attempt to fix load options handling
The load options handling is quite complicated and tries to accomodate
several scenarios, but there are currently multiple issues:
- If the supplied LoadOptions is an EFI_LOAD_OPTION structure,
second_stage gets initialized to the entire contents of the OptionalData
field and load_options is initialized to NULL, which means it isn't
possible to pass additional options to the second stage loader (and it
looks like the intention is for this to be supported).
- If the supplied LoadOptions contains 2 or more strings, the code seems
to assume that shim was executed from the UEFI shell and that the first
argument is the path of the shim executable, so it's ignored. But this
breaks the ability to pass additional options to the second stage loader
from BDS on firmware implementations that initialize LoadOptions to just
the OptionalData field of the EFI_LOAD_OPTION, which is what EDK2 seems
to do.
This is moot anyway because this case (strings == 2) doesn't actually seem
to work, as nothing sets loader_len and therefore second_stage is not set
to the custom loader path.
- If the supplied LoadOptions contains a single string that isn't shim's
path, nothing sets loader_len and therefore second_stage isn't set at the
end of set_second_stage.
- set_second_stage replaces L' ' characters with L'\0' - whilst this is
useful to NULL terminate the path for the second stage, it doesn't seem
quite right to do this for the remaining LoadOptions data. Grub's
chainloader command supplies additional arguments as a NULL-terminated
space-delimited string via LoadOptions. Making it NULL-delimited seems to
be incompatible with the kernel's commandline handling, which wouldn't
work for scenarios where you might want to direct-boot a kernel image
(wrapped in systemd's EFI stub) from shim.
- handle_image passes the original LoadOptions to the second stage if
load_options is NULL, which means that the second stage currently always
gets shim's load options.
I've made an attempt to try to fix things. After the initial
checks in set_second_stage, it now does this:
- Tries to parse LoadOptions as an EFI_LOAD_OPTION in order to extract
the OptionalData if it is.
- If it's not an EFI_LOAD_OPTION, check if the first string is the
current shim path and ignore it if it is (the UEFI shell case).
- Split LoadOptions in to a single NULL terminated string (used to
initialize second_stage) and the unmodified remaining data (used to
initialize load_options and load_options_size).
I've also modified handle_image to always set LoadOptions and
LoadOptionsSize. If shim is executed with no options, or is only
executed with a single option to override the second stage loader
path, the second stage is executed with LoadOptions = NULL and
LoadOptionsSize = 0 now.
I've tested this on EDK2 and I can load a custom loader with extra
options from both BDS and the UEFI shell:
FS0:\> shimx64.efi test.efi
LoadOptionsSize: 0
LoadOptions: (null)
FS0:\> shimx64.efi test.efi
LoadOptionsSize: 0
LoadOptions: (null)
FS0:\> shimx64.efi test.efi foo bar
LoadOptionsSize: 16
LoadOptions: foo bar
---
include/ucs2.h | 27 -------
pe.c | 6 +-
shim.c | 200 ++++++++++++++++++++++---------------------------
3 files changed, 92 insertions(+), 141 deletions(-)
diff --git a/include/ucs2.h b/include/ucs2.h
index e43c341..ee038ce 100644
--- a/include/ucs2.h
+++ b/include/ucs2.h
@@ -81,31 +81,4 @@ is_all_nuls(UINT8 *data, UINTN data_size)
return true;
}
-static inline UINTN
-__attribute__((__unused__))
-count_ucs2_strings(UINT8 *data, UINTN data_size)
-{
- UINTN pos = 0;
- UINTN last_nul_pos = 0;
- UINTN num_nuls = 0;
- UINTN i;
-
- if (data_size % 2 != 0)
- return 0;
-
- for (i = pos; i < data_size; i++) {
- if (i % 2 != 0) {
- if (data[i] != 0)
- return 0;
- } else if (data[i] == 0) {
- last_nul_pos = i;
- num_nuls++;
- }
- pos = i;
- }
- if (num_nuls > 0 && last_nul_pos != pos - 1)
- return 0;
- return num_nuls;
-}
-
#endif /* SHIM_UCS2_H */
diff --git a/pe.c b/pe.c
index 365e32a..13bc397 100644
--- a/pe.c
+++ b/pe.c
@@ -1144,10 +1144,8 @@ handle_image (void *data, unsigned int datasize,
li->ImageSize = context.ImageSize;
/* Pass the load options to the second stage loader */
- if ( load_options ) {
- li->LoadOptions = load_options;
- li->LoadOptionsSize = load_options_size;
- }
+ li->LoadOptions = load_options;
+ li->LoadOptionsSize = load_options_size;
if (!found_entry_point) {
perror(L"Entry point is not within sections\n");
diff --git a/shim.c b/shim.c
index 40e4894..ecf6ee5 100644
--- a/shim.c
+++ b/shim.c
@@ -1241,9 +1241,13 @@ EFI_STATUS init_grub(EFI_HANDLE image_handle)
return efi_status;
}
+/*
+ * Extract the OptionalData and OptionalData fields from an
+ * EFI_LOAD_OPTION.
+ */
static inline EFI_STATUS
-get_load_option_optional_data(UINT8 *data, UINTN data_size,
- UINT8 **od, UINTN *ods)
+get_load_option_optional_data(VOID *data, UINT32 data_size,
+ VOID **od, UINT32 *ods)
{
/*
* If it's not at least Attributes + FilePathListLength +
@@ -1253,7 +1257,8 @@ get_load_option_optional_data(UINT8 *data, UINTN data_size,
if (data_size < (sizeof(UINT32) + sizeof(UINT16) + 2 + 4))
return EFI_INVALID_PARAMETER;
- UINT8 *cur = data + sizeof(UINT32);
+ UINT8 *start = (UINT8 *)data;
+ UINT8 *cur = start + sizeof(UINT32);
UINT16 fplistlen = *(UINT16 *)cur;
/*
* If there's not enough space for the file path list and the
@@ -1263,8 +1268,8 @@ get_load_option_optional_data(UINT8 *data, UINTN data_size,
return EFI_INVALID_PARAMETER;
cur += sizeof(UINT16);
- UINTN limit = data_size - (cur - data) - fplistlen;
- UINTN i;
+ UINT32 limit = data_size - (cur - start) - fplistlen;
+ UINT32 i;
for (i = 0; i < limit ; i++) {
/* If the description isn't valid UCS2-LE, it's not valid. */
if (i % 2 != 0) {
@@ -1380,6 +1385,57 @@ done:
return ret;
}
+/*
+ * Split the supplied load options in to a NULL terminated
+ * string representing the path of the second stage loader,
+ * and return a pointer to the remaining load options data
+ * and its remaining size.
+ *
+ * This expects the supplied load options to begin with a
+ * string that is either NULL terminated or terminated with
+ * a space and some optional data. It will return NULL if
+ * the supplied load options contains no spaces or NULL
+ * terminators.
+ */
+static CHAR16 *
+split_load_options(VOID *in, UINT32 in_size,
+ VOID **remaining,
+ UINT32 *remaining_size) {
+ UINTN i;
+ CHAR16 *arg0 = NULL;
+ CHAR16 *start = (CHAR16 *)in;
+
+ /* Skip spaces */
+ for (i = 0; i < in_size / sizeof(CHAR16); i++) {
+ if (*start != L' ')
+ break;
+
+ start++;
+ }
+
+ in_size -= ((VOID *)start - in);
+
+ /*
+ * Ensure that the first argument is NULL terminated by
+ * replacing L' ' with L'\0'.
+ */
+ for (i = 0; i < in_size / sizeof(CHAR16); i++) {
+ if (start[i] == L' ' || start[i] == L'\0') {
+ start[i] = L'\0';
+ arg0 = (CHAR16 *)start;
+ break;
+ }
+ }
+
+ if (arg0) {
+ UINTN skip = i + 1;
+ *remaining_size = in_size - (skip * sizeof(CHAR16));
+ *remaining = *remaining_size > 0 ? start + skip : NULL;
+ }
+
+ return arg0;
+}
+
/*
* Check the load options to specify the second stage loader
*/
@@ -1387,20 +1443,11 @@ EFI_STATUS set_second_stage (EFI_HANDLE image_handle)
{
EFI_STATUS efi_status;
EFI_LOADED_IMAGE *li = NULL;
- CHAR16 *start = NULL;
- UINTN remaining_size = 0;
+ VOID *remaining = NULL;
+ UINT32 remaining_size;
CHAR16 *loader_str = NULL;
- UINTN loader_len = 0;
- unsigned int i;
- UINTN second_stage_len;
- second_stage_len = (StrLen(DEFAULT_LOADER) + 1) * sizeof(CHAR16);
- second_stage = AllocatePool(second_stage_len);
- if (!second_stage) {
- perror(L"Could not allocate %lu bytes\n", second_stage_len);
- return EFI_OUT_OF_RESOURCES;
- }
- StrCpy(second_stage, DEFAULT_LOADER);
+ second_stage = DEFAULT_LOADER;
load_options = NULL;
load_options_size = 0;
@@ -1499,105 +1546,44 @@ EFI_STATUS set_second_stage (EFI_HANDLE image_handle)
return EFI_SUCCESS;
/*
- * Check and see if this is just a list of strings. If it's an
- * EFI_LOAD_OPTION, it'll be 0, since we know EndEntire device path
- * won't pass muster as UCS2-LE.
- *
- * If there are 3 strings, we're launched from the shell most likely,
- * But we actually only care about the second one.
+ * See if this is an EFI_LOAD_OPTION and extract the optional
+ * data if it is. This will return an error if it is not a valid
+ * EFI_LOAD_OPTION.
*/
- UINTN strings = count_ucs2_strings(li->LoadOptions,
- li->LoadOptionsSize);
-
- /*
- * In some cases we get strings == 1 because BDS is using L' ' as the
- * delimeter:
- * 0000:74 00 65 00 73 00 74 00 2E 00 65 00 66 00 69 00 t.e.s.t...e.f.i.
- * 0016:20 00 6F 00 6E 00 65 00 20 00 74 00 77 00 6F 00 ..o.n.e...t.w.o.
- * 0032:20 00 74 00 68 00 72 00 65 00 65 00 00 00 ..t.h.r.e.e...
- *
- * If so replace it with NULs since the code already handles that
- * case.
- */
- if (strings == 1) {
- UINT16 *cur = start = li->LoadOptions;
-
- /* replace L' ' with L'\0' if we find any */
- for (i = 0; i < li->LoadOptionsSize / 2; i++) {
- if (cur[i] == L' ')
- cur[i] = L'\0';
- }
-
- /* redo the string count */
- strings = count_ucs2_strings(li->LoadOptions,
- li->LoadOptionsSize);
- }
-
- /*
- * If it's not string data, try it as an EFI_LOAD_OPTION.
- */
- if (strings == 0) {
- /*
- * We at least didn't find /enough/ strings. See if it works
- * as an EFI_LOAD_OPTION.
- */
- efi_status = get_load_option_optional_data(li->LoadOptions,
- li->LoadOptionsSize,
- (UINT8 **)&start,
- &loader_len);
- if (EFI_ERROR(efi_status))
- return EFI_SUCCESS;
-
- remaining_size = 0;
- } else if (strings >= 2) {
+ efi_status = get_load_option_optional_data(li->LoadOptions,
+ li->LoadOptionsSize,
+ &li->LoadOptions,
+ &li->LoadOptionsSize);
+ if (EFI_ERROR(efi_status)) {
/*
+ * it's not an EFI_LOAD_OPTION, so it's probably just a string
+ * or list of strings.
+ *
* UEFI shell copies the whole line of the command into
- * LoadOptions. We ignore the string before the first L'\0',
- * i.e. the name of this program.
+ * LoadOptions. We ignore the first string, i.e. the name of this
+ * program in this case.
*/
- UINT16 *cur = li->LoadOptions;
- for (i = 1; i < li->LoadOptionsSize / 2; i++) {
- if (cur[i - 1] == L'\0') {
- start = &cur[i];
- remaining_size = li->LoadOptionsSize - (i * 2);
- break;
- }
+ CHAR16 *loader_str = split_load_options(li->LoadOptions,
+ li->LoadOptionsSize,
+ &remaining,
+ &remaining_size);
+
+ if (loader_str && is_our_path(li, loader_str)) {
+ li->LoadOptions = remaining;
+ li->LoadOptionsSize = remaining_size;
}
-
- remaining_size -= i * 2 + 2;
- } else if (strings == 1 && is_our_path(li, start)) {
- /*
- * And then I found a version of BDS that gives us our own path
- * in LoadOptions:
-
-77162C58 5c 00 45 00 46 00 49 00 |\.E.F.I.|
-77162C60 5c 00 42 00 4f 00 4f 00 54 00 5c 00 42 00 4f 00 |\.B.O.O.T.\.B.O.|
-77162C70 4f 00 54 00 58 00 36 00 34 00 2e 00 45 00 46 00 |O.T.X.6.4...E.F.|
-77162C80 49 00 00 00 |I...|
-
- * which is just cruel... So yeah, just don't use it.
- */
- return EFI_SUCCESS;
}
+ loader_str = split_load_options(li->LoadOptions, li->LoadOptionsSize,
+ &remaining, &remaining_size);
+
/*
* Set up the name of the alternative loader and the LoadOptions for
* the loader
*/
- if (loader_len > 0) {
- /* we might not always have a NULL at the end */
- loader_str = AllocatePool(loader_len + 2);
- if (!loader_str) {
- perror(L"Failed to allocate loader string\n");
- return EFI_OUT_OF_RESOURCES;
- }
-
- for (i = 0; i < loader_len / 2; i++)
- loader_str[i] = start[i];
- loader_str[loader_len/2] = L'\0';
-
+ if (loader_str) {
second_stage = loader_str;
- load_options = remaining_size ? start + (loader_len/2) : NULL;
+ load_options = remaining;
load_options_size = remaining_size;
}
@@ -1777,12 +1763,6 @@ shim_fini(void)
unhook_exit();
- /*
- * Free the space allocated for the alternative 2nd stage loader
- */
- if (load_options_size > 0 && second_stage)
- FreePool(second_stage);
-
console_fini();
}
--
2.27.0

10
shim.spec
View File

@ -22,7 +22,7 @@
Name: shim
Version: 15.4
Release: 2
Release: 3
Summary: First-stage UEFI bootloader
ExclusiveArch: x86_64 aarch64
License: BSD
@ -31,6 +31,11 @@ Source0: https://github.com/rhboot/shim/releases/download/%{version}/shim-%{v
Source1: BOOTAA64.CSV
Source2: BOOTX64.CSV
Patch0: backport-shim-another-attempt-to-fix-load-options-handling.patch
Patch1: backport-arm-aa64-fix-the-size-of-.rela-sections.patch
Patch2: backport-mok-relax-the-maximum-variable-size-check.patch
Patch3: backport-mok-delete-the-existing-RT-variables-only-when-only_.patch
BuildRequires: elfutils-libelf-devel openssl-devel openssl git pesign gnu-efi gnu-efi-devel gcc
Requires: dbxtool efi-filesystem mokutil
Provides: bundled(openssl) = 1.0.2j
@ -136,6 +141,9 @@ cd ..
/usr/src/debug/%{name}-%{version}-%{release}/*
%changelog
* Tue Jul 5 2022 Hugel <gengqihu1@h-partners.com> - 15.4-3
- fix shim occasionally crashes in _relocate() on AArch64
* Thu Mar 3 2022 panxiaohe <panxh.life@foxmail.com> - 15.4-2
- list files into debuginfo subpackage