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[174.21.81.121]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e1e8665529sm3787753a91.39.2024.10.05.09.48.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 05 Oct 2024 09:48:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1728146930; x=1728751730; darn=nongnu.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=iSrAwBk5bZNjn8Zy9dmgJJyBe5UY35yHEd3GQKBCY9s=; b=DITQYRdl1swQoyMDsXKkCOgW6axBDTsJmssDJrwNyvwvYby36+8MKwPlbdMOOP7UOh 12sF+RfZjpxk56WenEYPIBUWZ8mo9LobA+39ohsi+kXtJc/namoDKXxaHYyXkk54YbY3 QohKCqSSWEZFYJzuOmB4RnyTp1+Ike0yq4AR6xxhAAIbI3fZ/+3+em4vRonWGOHu9b/g /X2okF+8XNwZGZCJY84dS/7V83Upnxqp+c+Ct+N/zX1+PSrUg6BbIjPaOp0GgCGt//QA RpYLOtKoZ6lqBT8ukPRekeQuvO76XWmgOztmi219x/s46jRZaIMXrktkItKelwiHP+M5 epzQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728146930; x=1728751730; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=iSrAwBk5bZNjn8Zy9dmgJJyBe5UY35yHEd3GQKBCY9s=; b=A6TEcZ04WQ9+8SN57zVVlxpeAx9xdFyOHgAJ8OeahF0CMSN892/l9lCWnnXl9n5TfG 1F68iwI0mmBU09dt15Y8TLwwh72M51u7wTJhpgN6NCFEmCGrt0x1uwkC9naDJtjB+2v2 gnAvFMy0CTarDxFBVtZRQNN3MzSLfQqKN8V8XNDEnX73z1LwI12hfQrxfiJn5dzaiGbd d0yXxuNhZtgYl6UPbnJAZCD9aLlnY5urF4jRAyKq92bRTkVIbsu4KCYm4MJwRPQQYvZm emwvQgZJ7Bau2M+hgDh3jieYyXANu7BOkFWlYALxaj818NQwxcSAMrwMxNrpfe2G0oq0 03Ew== X-Gm-Message-State: AOJu0YxPBamN3SL9BnvSsRwfrjSjPzfu4u5puGn8WaSJaJSPeysLVHrv L8FwHk7HkZ+/RPOOLaBZZtfl8wBNL0WstQ1ekx/11YX9t9nEdC8UVWIfXmmI+JqcRcEHaDSbRLx C X-Google-Smtp-Source: AGHT+IHrFaiYUXXkb+26350+hd1YbPnIQtBz5AsI6Sj550FvAE750ku6uhOBe2SWhE5QfHvBKUx51Q== X-Received: by 2002:a17:90a:c7c9:b0:2e0:a4a4:75d9 with SMTP id 98e67ed59e1d1-2e1e622860emr7885380a91.12.1728146930528; Sat, 05 Oct 2024 09:48:50 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: mjt@tls.msk.ru Subject: [PATCH] linux-user: Fix parse_elf_properties GNU0_MAGIC check Date: Sat, 5 Oct 2024 09:48:49 -0700 Message-ID: <20241005164849.424838-1-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::102f; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x102f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1728146994303116600 Content-Type: text/plain; charset="utf-8" Comparing a string of 4 bytes only works in little-endian. Adjust bulk bswap to only apply to the note payload. Perform swapping of the note header manually; the magic is defined so that it does not need a runtime swap. Fixes: 83f990eb5adb ("linux-user/elfload: Parse NT_GNU_PROPERTY_TYPE_0 note= s") Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2596 Signed-off-by: Richard Henderson Reviewed-by: Michael Tokarev --- linux-user/elfload.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/linux-user/elfload.c b/linux-user/elfload.c index 0678c9d506..52c88a68a9 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -3121,11 +3121,11 @@ static bool parse_elf_properties(const ImageSource = *src, } =20 /* - * The contents of a valid PT_GNU_PROPERTY is a sequence - * of uint32_t -- swap them all now. + * The contents of a valid PT_GNU_PROPERTY is a sequence of uint32_t. + * Swap most of them now, beyond the header and namesz. */ #ifdef BSWAP_NEEDED - for (int i =3D 0; i < n / 4; i++) { + for (int i =3D 4; i < n / 4; i++) { bswap32s(note.data + i); } #endif @@ -3135,15 +3135,15 @@ static bool parse_elf_properties(const ImageSource = *src, * immediately follows nhdr and is thus at the 4th word. Further, all * of the inputs to the kernel's round_up are multiples of 4. */ - if (note.nhdr.n_type !=3D NT_GNU_PROPERTY_TYPE_0 || - note.nhdr.n_namesz !=3D NOTE_NAME_SZ || + if (tswap32(note.nhdr.n_type) !=3D NT_GNU_PROPERTY_TYPE_0 || + tswap32(note.nhdr.n_namesz) !=3D NOTE_NAME_SZ || note.data[3] !=3D GNU0_MAGIC) { error_setg(errp, "Invalid note in PT_GNU_PROPERTY"); return false; } off =3D sizeof(note.nhdr) + NOTE_NAME_SZ; =20 - datasz =3D note.nhdr.n_descsz + off; + datasz =3D tswap32(note.nhdr.n_descsz) + off; if (datasz > n) { error_setg(errp, "Invalid note size in PT_GNU_PROPERTY"); return false; --=20 2.43.0