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Fri, 23 Aug 2024 10:05:32 -0700 (PDT) From: Javi Merino To: xen-devel@lists.xenproject.org Cc: jbeulich@suse.com, andrew.cooper3@citrix.com, Javi Merino , Anthony PERARD , Juergen Gross , =?UTF-8?q?Edwin=20T=C3=B6r=C3=B6k?= Subject: [XEN PATCH v2 1/3] libxl: Fix nul-termination of the return value of libxl_xen_console_read_line() Date: Fri, 23 Aug 2024 18:05:03 +0100 Message-ID: X-Mailer: git-send-email 2.45.2 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1724432748313116600 When built with ASAN, "xl dmesg" crashes in the "printf("%s", line)" call in main_dmesg(). ASAN reports a heap buffer overflow: an off-by-one access to cr->buffer. The readconsole sysctl copies up to count characters into the buffer, but it does not add a null character at the end. Despite the documentation of libxl_xen_console_read_line(), line_r is not nul-terminated if 16384 characters were copied to the buffer. Fix this by asking xc_readconsolering() to fill the buffer up to size - 1. As the number of characters in the buffer is only needed in libxl_xen_console_read_line(), make it a local variable there instead of part of the libxl__xen_console_reader struct. Fixes: 4024bae739cc ("xl: Add subcommand 'xl dmesg'") Reported-by: Edwin T=C3=B6r=C3=B6k Signed-off-by: Javi Merino Reviewed-by: Anthony PERARD --- tools/libs/light/libxl_console.c | 14 ++++++++++---- tools/libs/light/libxl_internal.h | 1 - 2 files changed, 10 insertions(+), 5 deletions(-) diff --git a/tools/libs/light/libxl_console.c b/tools/libs/light/libxl_cons= ole.c index a563c9d3c7f9..012fd996fba9 100644 --- a/tools/libs/light/libxl_console.c +++ b/tools/libs/light/libxl_console.c @@ -774,12 +774,14 @@ libxl_xen_console_reader * { GC_INIT(ctx); libxl_xen_console_reader *cr; - unsigned int size =3D 16384; + /* We want xen to fill the buffer in as few hypercalls as + * possible, but xen will not nul-terminate it. Leave one byte at + * the end for the null */ + unsigned int size =3D 16384 + 1; =20 cr =3D libxl__zalloc(NOGC, sizeof(libxl_xen_console_reader)); cr->buffer =3D libxl__zalloc(NOGC, size); cr->size =3D size; - cr->count =3D size; cr->clear =3D clear; cr->incremental =3D 1; =20 @@ -800,10 +802,14 @@ int libxl_xen_console_read_line(libxl_ctx *ctx, char **line_r) { int ret; + /* number of chars to copy into the buffer. xc_readconsolering() + * does not add a null character at the end, so leave a space for + * us to add it. */ + unsigned int nr_chars =3D cr->size - 1; GC_INIT(ctx); =20 memset(cr->buffer, 0, cr->size); - ret =3D xc_readconsolering(ctx->xch, cr->buffer, &cr->count, + ret =3D xc_readconsolering(ctx->xch, cr->buffer, &nr_chars, cr->clear, cr->incremental, &cr->index); if (ret < 0) { LOGE(ERROR, "reading console ring buffer"); @@ -811,7 +817,7 @@ int libxl_xen_console_read_line(libxl_ctx *ctx, return ERROR_FAIL; } if (!ret) { - if (cr->count) { + if (nr_chars) { *line_r =3D cr->buffer; ret =3D 1; } else { diff --git a/tools/libs/light/libxl_internal.h b/tools/libs/light/libxl_int= ernal.h index 3b58bb2d7f43..96d14f5746e1 100644 --- a/tools/libs/light/libxl_internal.h +++ b/tools/libs/light/libxl_internal.h @@ -2077,7 +2077,6 @@ _hidden char *libxl__uuid2string(libxl__gc *gc, const= libxl_uuid uuid); struct libxl__xen_console_reader { char *buffer; unsigned int size; - unsigned int count; unsigned int clear; unsigned int incremental; unsigned int index; --=20 2.45.2 From nobody Sun Feb 8 03:04:45 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=reject dis=none) header.from=cloud.com ARC-Seal: i=1; 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Fri, 23 Aug 2024 10:05:40 -0700 (PDT) From: Javi Merino To: xen-devel@lists.xenproject.org Cc: jbeulich@suse.com, andrew.cooper3@citrix.com, Javi Merino , Anthony PERARD , Juergen Gross Subject: [XEN PATCH v2 2/3] libxl: Remove unnecessary buffer zeroing and zalloc() Date: Fri, 23 Aug 2024 18:05:04 +0100 Message-ID: X-Mailer: git-send-email 2.45.2 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1724432760367116600 Content-Type: text/plain; charset="utf-8" When reading the console, xen overwrites the contents of the buffer, so there is no need to zero the buffer before passing it to xen. Instead, add a NULL at the end of the buffer. While we are at it, change the zalloc() of the buffer back to malloc() as it was before bdf4131 (libxl: don't leak buf in libxl_xen_console_read_start error handling, 2013-12-03). The comment in that commit message says that the intent of the commit was to change malloc+memset to zalloc(), but only for the libxl_xen_console_reader struct, not for the buffer. Signed-off-by: Javi Merino Reviewed-by: Anthony PERARD --- tools/libs/light/libxl_console.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/libs/light/libxl_console.c b/tools/libs/light/libxl_cons= ole.c index 012fd996fba9..f42f6a51ee6f 100644 --- a/tools/libs/light/libxl_console.c +++ b/tools/libs/light/libxl_console.c @@ -780,7 +780,7 @@ libxl_xen_console_reader * unsigned int size =3D 16384 + 1; =20 cr =3D libxl__zalloc(NOGC, sizeof(libxl_xen_console_reader)); - cr->buffer =3D libxl__zalloc(NOGC, size); + cr->buffer =3D libxl__malloc(NOGC, size); cr->size =3D size; cr->clear =3D clear; cr->incremental =3D 1; @@ -808,7 +808,6 @@ int libxl_xen_console_read_line(libxl_ctx *ctx, unsigned int nr_chars =3D cr->size - 1; GC_INIT(ctx); =20 - memset(cr->buffer, 0, cr->size); ret =3D xc_readconsolering(ctx->xch, cr->buffer, &nr_chars, cr->clear, cr->incremental, &cr->index); if (ret < 0) { @@ -818,6 +817,7 @@ int libxl_xen_console_read_line(libxl_ctx *ctx, } if (!ret) { if (nr_chars) { + cr->buffer[nr_chars] =3D '\0'; 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Fri, 23 Aug 2024 10:05:44 -0700 (PDT) From: Javi Merino To: xen-devel@lists.xenproject.org Cc: jbeulich@suse.com, andrew.cooper3@citrix.com, Javi Merino , Anthony PERARD , Juergen Gross Subject: [XEN PATCH v2 3/3] libxl: Update the documentation of libxl_xen_console_read_line() Date: Fri, 23 Aug 2024 18:05:05 +0100 Message-ID: X-Mailer: git-send-email 2.45.2 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1724432762305116600 Content-Type: text/plain; charset="utf-8" Despite its name, libxl_xen_console_read_line() does not read a line, it fills the buffer with as many characters as fit. Update the documentation to reflect the real behaviour of the function. Rename line_r to avoid confusion since it is a pointer to an array of characters. Signed-off-by: Javi Merino --- tools/libs/light/libxl_console.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/tools/libs/light/libxl_console.c b/tools/libs/light/libxl_cons= ole.c index f42f6a51ee6f..652897e4ef6d 100644 --- a/tools/libs/light/libxl_console.c +++ b/tools/libs/light/libxl_console.c @@ -789,17 +789,19 @@ libxl_xen_console_reader * return cr; } =20 -/* return values: *line_r - * 1 success, whole line obtained from buffer non-0 - * 0 no more lines available right now 0 - * negative error code ERROR_* 0 - * On success *line_r is updated to point to a nul-terminated +/* Copy part of the console ring into a buffer + * + * Return values: + * 1: Success, the buffer obtained from the console ring an + * 0: No more lines available right now + * -ERROR_* on error + * + * On success, *line_r is updated to point to a nul-terminated * string which is valid until the next call on the same console - * reader. The libxl caller may overwrite parts of the string - * if it wishes. */ + * reader. */ int libxl_xen_console_read_line(libxl_ctx *ctx, libxl_xen_console_reader *cr, - char **line_r) + char **buff) { int ret; /* number of chars to copy into the buffer. xc_readconsolering() @@ -818,10 +820,10 @@ int libxl_xen_console_read_line(libxl_ctx *ctx, if (!ret) { if (nr_chars) { cr->buffer[nr_chars] =3D '\0'; - *line_r =3D cr->buffer; + *buff =3D cr->buffer; ret =3D 1; } else { - *line_r =3D NULL; + *buff =3D NULL; ret =3D 0; } } --=20 2.45.2