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Mon, 19 Aug 2024 05:35:20 -0700 (PDT) From: Frediano Ziglio To: xen-devel@lists.xenproject.org Cc: Frediano Ziglio , "Daniel P. Smith" , =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= , Jan Beulich , Andrew Cooper Subject: [PATCH v2] Avoid crash calling PrintErrMesg from efi_multiboot2 Date: Mon, 19 Aug 2024 13:35:06 +0100 Message-ID: <20240819123508.217444-1-frediano.ziglio@cloud.com> X-Mailer: git-send-email 2.46.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1724070945792116600 Content-Type: text/plain; charset="utf-8" Although code is compiled with -fpic option data is not position independent. This causes data pointer to become invalid if code is not relocated properly which is what happens for efi_multiboot2 which is called by multiboot entry code. Code tested adding PrintErrMesg(L"Test message", EFI_BUFFER_TOO_SMALL); in efi_multiboot2 before calling efi_arch_edd (this function can potentially call PrintErrMesg). Before the patch (XenServer installation on Qemu, xen replaced with vanilla xen.gz): Booting `XenServer (Serial)'Booting `XenServer (Serial)' Test message: !!!! X64 Exception Type - 0E(#PF - Page-Fault) CPU Apic ID= - 00000000 !!!! ExceptionData - 0000000000000000 I:0 R:0 U:0 W:0 P:0 PK:0 SS:0 SGX:0 RIP - 000000007DC29E46, CS - 0000000000000038, RFLAGS - 0000000000210246 RAX - 0000000000000000, RCX - 0000000000000050, RDX - 0000000000000000 RBX - 000000007DAB4558, RSP - 000000007EFA1200, RBP - 0000000000000000 RSI - FFFF82D040467A88, RDI - 0000000000000000 R8 - 000000007EFA1238, R9 - 000000007EFA1230, R10 - 0000000000000000 R11 - 000000007CF42665, R12 - FFFF82D040467A88, R13 - 000000007EFA1228 R14 - 000000007EFA1225, R15 - 000000007DAB45A8 DS - 0000000000000030, ES - 0000000000000030, FS - 0000000000000030 GS - 0000000000000030, SS - 0000000000000030 CR0 - 0000000080010033, CR2 - FFFF82D040467A88, CR3 - 000000007EC01000 CR4 - 0000000000000668, CR8 - 0000000000000000 DR0 - 0000000000000000, DR1 - 0000000000000000, DR2 - 0000000000000000 DR3 - 0000000000000000, DR6 - 00000000FFFF0FF0, DR7 - 0000000000000400 GDTR - 000000007E9E2000 0000000000000047, LDTR - 0000000000000000 IDTR - 000000007E4E5018 0000000000000FFF, TR - 0000000000000000 FXSAVE_STATE - 000000007EFA0E60 !!!! Find image based on IP(0x7DC29E46) (No PDB) (ImageBase=3D000000007D= C28000, EntryPoint=3D000000007DC2B917) !!!! After the patch: Booting `XenServer (Serial)'Booting `XenServer (Serial)' Test message: Buffer too small BdsDxe: loading Boot0000 "UiApp" from Fv(7CB8BDC9-F8EB-4F34-AAEA-3EE4AF65= 16A1)/FvFile(462CAA21-7614-4503-836E-8AB6F4662331) BdsDxe: starting Boot0000 "UiApp" from Fv(7CB8BDC9-F8EB-4F34-AAEA-3EE4AF6= 516A1)/FvFile(462CAA21-7614-4503-836E-8AB6F4662331) Fixes: 00d5d5ce23e6 ("work around Clang generating .data.rel.ro section for= init-only files") Signed-off-by: Frediano Ziglio --- xen/common/efi/boot.c | 45 +++++++++++++++++++++++++++++-------------- 1 file changed, 31 insertions(+), 14 deletions(-) --- Changes since v1: - added "Fixes:" tag; - fixed cast style change. diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c index efbec00af9..bbcd9263e1 100644 --- a/xen/common/efi/boot.c +++ b/xen/common/efi/boot.c @@ -287,19 +287,36 @@ static bool __init match_guid(const EFI_GUID *guid1, = const EFI_GUID *guid2) /* generic routine for printing error messages */ static void __init PrintErrMesg(const CHAR16 *mesg, EFI_STATUS ErrCode) { - static const CHAR16* const ErrCodeToStr[] __initconstrel =3D { - [~EFI_ERROR_MASK & EFI_NOT_FOUND] =3D L"Not found", - [~EFI_ERROR_MASK & EFI_NO_MEDIA] =3D L"The device has n= o media", - [~EFI_ERROR_MASK & EFI_MEDIA_CHANGED] =3D L"Media changed", - [~EFI_ERROR_MASK & EFI_DEVICE_ERROR] =3D L"Device error", - [~EFI_ERROR_MASK & EFI_VOLUME_CORRUPTED] =3D L"Volume corrupted= ", - [~EFI_ERROR_MASK & EFI_ACCESS_DENIED] =3D L"Access denied", - [~EFI_ERROR_MASK & EFI_OUT_OF_RESOURCES] =3D L"Out of resources= ", - [~EFI_ERROR_MASK & EFI_VOLUME_FULL] =3D L"Volume is full", - [~EFI_ERROR_MASK & EFI_SECURITY_VIOLATION] =3D L"Security violati= on", - [~EFI_ERROR_MASK & EFI_CRC_ERROR] =3D L"CRC error", - [~EFI_ERROR_MASK & EFI_COMPROMISED_DATA] =3D L"Compromised data= ", - [~EFI_ERROR_MASK & EFI_BUFFER_TOO_SMALL] =3D L"Buffer too small= ", +#define ERROR_MESSAGE_LIST \ + ERROR_MESSAGE(EFI_NOT_FOUND, "Not found") \ + ERROR_MESSAGE(EFI_NO_MEDIA, "The device has no media") \ + ERROR_MESSAGE(EFI_MEDIA_CHANGED, "Media changed") \ + ERROR_MESSAGE(EFI_DEVICE_ERROR, "Device error") \ + ERROR_MESSAGE(EFI_VOLUME_CORRUPTED, "Volume corrupted") \ + ERROR_MESSAGE(EFI_ACCESS_DENIED, "Access denied") \ + ERROR_MESSAGE(EFI_OUT_OF_RESOURCES, "Out of resources") \ + ERROR_MESSAGE(EFI_VOLUME_FULL, "Volume is full") \ + ERROR_MESSAGE(EFI_SECURITY_VIOLATION, "Security violation") \ + ERROR_MESSAGE(EFI_CRC_ERROR, "CRC error") \ + ERROR_MESSAGE(EFI_COMPROMISED_DATA, "Compromised data") \ + ERROR_MESSAGE(EFI_BUFFER_TOO_SMALL, "Buffer too small") + + static const struct ErrorStrings { + CHAR16 start; +#undef ERROR_MESSAGE +#define ERROR_MESSAGE(code, str) CHAR16 msg_ ## code[sizeof(str)]; + ERROR_MESSAGE_LIST + } ErrorStrings __initconst =3D { + 0 +#undef ERROR_MESSAGE +#define ERROR_MESSAGE(code, str) , L ## str + ERROR_MESSAGE_LIST + }; + static const uint16_t ErrCodeToStr[] __initconst =3D { +#undef ERROR_MESSAGE +#define ERROR_MESSAGE(code, str) \ + [~EFI_ERROR_MASK & code] =3D offsetof(struct ErrorStrings, msg_ ##= code), + ERROR_MESSAGE_LIST }; EFI_STATUS ErrIdx =3D ErrCode & ~EFI_ERROR_MASK; =20 @@ -308,7 +325,7 @@ static void __init PrintErrMesg(const CHAR16 *mesg, EFI= _STATUS ErrCode) PrintErr(L": "); =20 if( (ErrIdx < ARRAY_SIZE(ErrCodeToStr)) && ErrCodeToStr[ErrIdx] ) - mesg =3D ErrCodeToStr[ErrIdx]; + mesg =3D (const CHAR16 *)((const void *)&ErrorStrings + ErrCodeToS= tr[ErrIdx]); else { PrintErr(L"ErrCode: "); --=20 2.46.0