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kexec-tools
kexec-tools-Add-option-to-fall-back-to-KEXEC_LO...
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File kexec-tools-Add-option-to-fall-back-to-KEXEC_LOAD.patch of Package kexec-tools
From: Michal Suchanek <msuchanek@suse.de> Date: Mon, 26 Feb 2018 12:24:44 +0100 Subject: kexec: Add option to fall back to KEXEC_LOAD when KEXEC_FILE_LOAD is not supported References: bsc#1080916, boo#1076839 Upstream: merged Git-commit: 9fa99c42cb911727a962b358c5b1d36d0fe338ab Not all architectures implement KEXEC_FILE_LOAD. However, on some archiectures KEXEC_FILE_LOAD is required when secure boot is enabled in locked-down mode. Previously users had to select the KEXEC_FILE_LOAD syscall with undocumented -s option. However, if they did pass the option kexec would fail on architectures that do not support it. So add an -a option that tries KEXEC_FILE_LOAD and when it is not supported tries KEXEC_LOAD. Signed-off-by: Michal Suchanek <msuchanek@suse.de> --- v3: instead of changing the deafult add extra option v4: actually check -ENOSYS as well v5: add missing break v6: - add note about ENOTSUPP - add description to help text --- kexec/kexec.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++----- kexec/kexec.h | 4 +++- 2 files changed, 63 insertions(+), 6 deletions(-) diff --git a/kexec/kexec.c b/kexec/kexec.c index 87689311af2f..612c1c2afbe5 100644 --- a/kexec/kexec.c +++ b/kexec/kexec.c @@ -1007,6 +1007,10 @@ void usage(void) " -s, --kexec-file-syscall Use file based syscall for kexec operation\n" " -c, --kexec-syscall Use the kexec_load syscall for for compatibility\n" " with systems that don't support -s (default)\n" + " -a, --kexec-syscall-auto Use file based syscall for kexec and fall\n" + " back to the compatibility syscall when file based\n" + " syscall is not supported or the kernel did not\n" + " understand the image\n" " -d, --debug Enable debugging to help spot a failure.\n" " -S, --status Return 0 if the type (by default crash) is loaded.\n" "\n" @@ -1245,6 +1249,7 @@ int main(int argc, char *argv[]) int do_unload = 0; int do_reuse_initrd = 0; int do_kexec_file_syscall = 0; + int do_kexec_fallback = 0; int do_status = 0; void *entry = 0; char *type = 0; @@ -1369,9 +1374,15 @@ int main(int argc, char *argv[]) break; case OPT_KEXEC_FILE_SYSCALL: do_kexec_file_syscall = 1; + do_kexec_fallback = 0; break; case OPT_KEXEC_SYSCALL: do_kexec_file_syscall = 0; + do_kexec_fallback = 0; + break; + case OPT_KEXEC_SYSCALL_AUTO: + do_kexec_file_syscall = 1; + do_kexec_fallback = 1; break; case OPT_STATUS: do_status = 1; @@ -1438,7 +1449,7 @@ int main(int argc, char *argv[]) } } if (do_kexec_file_syscall) { - if (do_load_jump_back_helper) + if (do_load_jump_back_helper && !do_kexec_fallback) die("--load-jump-back-helper not supported with kexec_file_load\n"); if (kexec_flags & KEXEC_PRESERVE_CONTEXT) die("--load-preserve-context not supported with kexec_file_load\n"); @@ -1452,16 +1463,60 @@ int main(int argc, char *argv[]) result = k_status(kexec_flags); } if (do_unload) { - if (do_kexec_file_syscall) + if (do_kexec_file_syscall) { result = kexec_file_unload(kexec_file_flags); - else + if ((result == -ENOSYS) && do_kexec_fallback) + do_kexec_file_syscall = 0; + } + if (!do_kexec_file_syscall) result = k_unload(kexec_flags); } if (do_load && (result == 0)) { - if (do_kexec_file_syscall) + if (do_kexec_file_syscall) { result = do_kexec_file_load(fileind, argc, argv, kexec_file_flags); - else + 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 (!do_kexec_file_syscall) result = my_load(type, fileind, argc, argv, kexec_flags, entry); } diff --git a/kexec/kexec.h b/kexec/kexec.h index 9fd0355eacd0..d445fbe3e486 100644 --- a/kexec/kexec.h +++ b/kexec/kexec.h @@ -220,6 +220,7 @@ extern int file_types; #define OPT_PANIC 'p' #define OPT_KEXEC_FILE_SYSCALL 's' #define OPT_KEXEC_SYSCALL 'c' +#define OPT_KEXEC_SYSCALL_AUTO 'a' #define OPT_STATUS 'S' #define OPT_MEM_MIN 256 #define OPT_MEM_MAX 257 @@ -248,11 +249,12 @@ extern int file_types; { "reuseinitrd", 0, 0, OPT_REUSE_INITRD }, \ { "kexec-file-syscall", 0, 0, OPT_KEXEC_FILE_SYSCALL }, \ { "kexec-syscall", 0, 0, OPT_KEXEC_SYSCALL }, \ + { "kexec-syscall-auto", 0, 0, OPT_KEXEC_SYSCALL_AUTO }, \ { "debug", 0, 0, OPT_DEBUG }, \ { "status", 0, 0, OPT_STATUS }, \ { "print-ckr-size", 0, 0, OPT_PRINT_CKR_SIZE }, \ -#define KEXEC_OPT_STR "h?vdfxyluet:pscS" +#define KEXEC_OPT_STR "h?vdfxyluet:pscaS" extern void dbgprint_mem_range(const char *prefix, struct memory_range *mr, int nr_mr); extern void die(const char *fmt, ...) -- 2.13.6
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