Accepting request 556516 from home:pmladek:branches:Base:System
- hardening of the console list generation (bsc#1071568): * libconsole-never-return-empty-list-from-getconsoles.patch * libconsole-Really-allow-to-use-dev-console-as-a-fall.patch * libconsole-Add-console-into-the-list-only-when-succe.patch * libconsole-Correctly-ignore-early-consoles.patch OBS-URL: https://build.opensuse.org/request/show/556516 OBS-URL: https://build.opensuse.org/package/show/Base:System/blog?expand=0&rev=26
This commit is contained in:
Dr. Werner Fink
Git OBS Bridge
parent
f205f5ad48
commit
937beaa81b
@ -1,3 +1,12 @@
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-------------------------------------------------------------------
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Tue Dec 12 15:30:53 UTC 2017 - pmladek@suse.com
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- hardening of the console list generation (bsc#1071568):
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* libconsole-never-return-empty-list-from-getconsoles.patch
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* libconsole-Really-allow-to-use-dev-console-as-a-fall.patch
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* libconsole-Add-console-into-the-list-only-when-succe.patch
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* libconsole-Correctly-ignore-early-consoles.patch
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-------------------------------------------------------------------
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Mon Nov 6 09:28:13 UTC 2017 - werner@suse.de
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12
blog.spec
12
blog.spec
@ -29,6 +29,14 @@ BuildRequires: suse-module-tools
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Requires(post): coreutils
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BuildRoot: %{_tmppath}/%{name}-%{version}-build
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Provides: sysvinit-tools:/sbin/blogd
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# PATCH-FIX-UPSTREAM libconsole-never-return-empty-list-from-getconsoles.patch bsc#1071568
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Patch0: libconsole-never-return-empty-list-from-getconsoles.patch
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# PATCH-FIX-UPSTREAM libconsole-Really-allow-to-use-dev-console-as-a-fall.patch bsc#1071568
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Patch1: libconsole-Really-allow-to-use-dev-console-as-a-fall.patch
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# PATCH-FIX-UPSTREAM libconsole-Add-console-into-the-list-only-when-succe.patch bsc#1071568
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Patch2: libconsole-Add-console-into-the-list-only-when-succe.patch
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# PATCH-FIX-UPSTREAM libconsole-Correctly-ignore-early-consoles.patch bsc#1071568
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Patch3: libconsole-Correctly-ignore-early-consoles.patch
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%description
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The blogd daemon determines the real underlying character device of
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@ -66,6 +74,10 @@ the LSB startproc command.
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%prep
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%setup -q -n showconsole-%version
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%patch0 -p1
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%patch1 -p1
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%patch2 -p1
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%patch3 -p1
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%build
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make %{?_smp_mflags} CC="%__cc" \
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112
libconsole-Add-console-into-the-list-only-when-succe.patch
Normal file
112
libconsole-Add-console-into-the-list-only-when-succe.patch
Normal file
@ -0,0 +1,112 @@
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From: Petr Mladek <pmladek@suse.com>
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Date: Tue, 12 Dec 2017 11:41:19 +0100
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Subject: libconsole: Add console into the list only when successfully allocated
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Git-commit: 34a74a07c05d53f7c71bf7ba44a48f8be32942fd
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References: bsc#1071568
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Upstream: merged
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consalloc() initializes the console when it is used from blogd (io = 1).
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This operation might fail when the related tty device cannot be opened.
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The structure is freed in this case but it was already added into
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the list before. This might cause access to a freed memory.
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This patch moves the initialization code into a separate function.
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The structure is added to the list only when the initialization
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succeeds. It is freed otherwise.
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Signed-off-by: Petr Mladek <pmladek@suse.com>
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---
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libconsole/console.c | 57 +++++++++++++++++++++++++++++-----------------------
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1 file changed, 32 insertions(+), 25 deletions(-)
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diff --git a/libconsole/console.c b/libconsole/console.c
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index 600e22608630..47e95a4b9046 100644
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--- a/libconsole/console.c
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+++ b/libconsole/console.c
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@@ -531,13 +531,39 @@ void closeIO(void)
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return;
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}
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+static int consinitIO(struct console *newc)
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+{
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+ int tflags;
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+
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+ if ((newc->fd = open(newc->tty, O_WRONLY|O_NONBLOCK|O_NOCTTY)) < 0) {
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+ if (errno == EACCES)
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+ error("can not open %s", newc->tty);
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+ warn("can not open %s", newc->tty);
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+ return 0;
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+ }
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+
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+ newc->tlock = 0;
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+ newc->max_canon = _POSIX_MAX_CANON;
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+ memset(&newc->ltio, 0, sizeof(newc->ltio));
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+ memset(&newc->otio, 0, sizeof(newc->otio));
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+ memset(&newc->ctio, 0, sizeof(newc->ctio));
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+ if ((tflags = fcntl(newc->fd, F_GETFL)) < 0)
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+ warn("can not get terminal flags of %s", newc->tty);
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+
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+ tflags &= ~(O_NONBLOCK);
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+ tflags |= O_NOCTTY;
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+ if (fcntl(newc->fd, F_SETFL, tflags) < 0)
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+ warn("can not set terminal flags of %s", newc->tty);
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+
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+ return 1;
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+}
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+
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/* Allocate a console */
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static list_t lcons = { &(lcons), &(lcons) };
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static int consalloc(struct console **cons, char *name, const int cflags, const dev_t dev, int io)
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{
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struct console *newc;
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list_t *head;
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- int tflags;
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if (!cons)
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error("missing console pointer");
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@@ -551,6 +577,11 @@ static int consalloc(struct console **cons, char *name, const int cflags, const
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newc->dev = dev;
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newc->pid = -1;
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+ if (io && !consinitIO(newc)) {
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+ free(newc);
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+ return 0;
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+ }
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+
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if (!*cons) {
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head = &lcons;
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*cons = (struct console*)head;
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@@ -558,30 +589,6 @@ static int consalloc(struct console **cons, char *name, const int cflags, const
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head = &(*cons)->node;
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insert(&newc->node, head);
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- if (!io)
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- return 1;
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-
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- if ((newc->fd = open(newc->tty, O_WRONLY|O_NONBLOCK|O_NOCTTY)) < 0) {
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- if (errno == EACCES)
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- error("can not open %s", newc->tty);
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- warn("can not open %s", newc->tty);
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- free(newc);
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- return 0;
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- }
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-
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- newc->tlock = 0;
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- newc->max_canon = _POSIX_MAX_CANON;
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- memset(&newc->ltio, 0, sizeof(newc->ltio));
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- memset(&newc->otio, 0, sizeof(newc->otio));
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- memset(&newc->ctio, 0, sizeof(newc->ctio));
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- if ((tflags = fcntl(newc->fd, F_GETFL)) < 0)
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- warn("can not get terminal flags of %s", newc->tty);
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-
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- tflags &= ~(O_NONBLOCK);
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- tflags |= O_NOCTTY;
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- if (fcntl(newc->fd, F_SETFL, tflags) < 0)
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- warn("can not set terminal flags of %s", newc->tty);
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-
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return 1;
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}
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--
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2.13.6
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55
libconsole-Correctly-ignore-early-consoles.patch
Normal file
55
libconsole-Correctly-ignore-early-consoles.patch
Normal file
@ -0,0 +1,55 @@
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From: Petr Mladek <pmladek@suse.com>
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Date: Tue, 12 Dec 2017 12:49:39 +0100
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Subject: libconsole: Correctly ignore early consoles
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Git-commit: 08b7314b53524040a16ce2a7f95a73304c55db30
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References: bsc#1071568
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Upstream: merged
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There might be consoles without tty binding. These do not have
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defined major and minor numbers in the /proc/consoles list.
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For example, it might look like:
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$> cat /proc/consoles
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pl11 -W- (E Bp )
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ttyAMA0 -W- (EC p a) 204:64
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Let's just ignore them.
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Signed-off-by: Petr Mladek <pmladek@suse.com>
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---
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libconsole/console.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/libconsole/console.c b/libconsole/console.c
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index 47e95a4b9046..c4396b1f9b5e 100644
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--- a/libconsole/console.c
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+++ b/libconsole/console.c
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@@ -609,6 +609,7 @@ void getconsoles(struct console **cons, int io)
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char fbuf[16], dev[64];
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char *tty = NULL;
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FILE *fc;
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+ int items;
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if (!cons)
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error("error: console pointer empty");
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@@ -621,11 +622,16 @@ void getconsoles(struct console **cons, int io)
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goto err;
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}
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- while ((fscanf(fc, "%*s %*s (%[^)]) %[0-9:]", &fbuf[0], &dev[0]) == 2)) {
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+ while ((items = fscanf(fc, "%*s %*s (%[^)]) %[0-9:]", &fbuf[0], &dev[0]))
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+ != EOF) {
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char *tmp;
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int flags, n, maj, min;
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int ret;
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+ /* Ignore consoles without tty binding. */
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+ if (items != 2)
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+ continue;
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+
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if (!strchr(fbuf, 'E'))
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continue;
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--
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2.13.6
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36
libconsole-Really-allow-to-use-dev-console-as-a-fall.patch
Normal file
36
libconsole-Really-allow-to-use-dev-console-as-a-fall.patch
Normal file
@ -0,0 +1,36 @@
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From: Petr Mladek <pmladek@suse.com>
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Date: Mon, 11 Dec 2017 16:40:39 +0100
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Subject: libconsole: Really allow to use /dev/console as a fallback in showconsole
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Git-commit: 19329e59e442c81d270028cbc945fe83a9732327
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References: bsc#1071568
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Upstream: merged
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consalloc() always returns an error when it is called from
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showconsole (with io = 0). As a result, /dev/console is ignored
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because it is not assigned to the global "cons" pointer
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in getconsoles().
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consalloc() should return success (1) when the console is added
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to the list and the io-related operations are skipped.
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Signed-off-by: Petr Mladek <pmladek@suse.com>
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---
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libconsole/console.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/libconsole/console.c b/libconsole/console.c
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index 2f6e0b1d56d9..600e22608630 100644
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--- a/libconsole/console.c
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+++ b/libconsole/console.c
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@@ -559,7 +559,7 @@ static int consalloc(struct console **cons, char *name, const int cflags, const
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insert(&newc->node, head);
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if (!io)
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- return 0;
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+ return 1;
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if ((newc->fd = open(newc->tty, O_WRONLY|O_NONBLOCK|O_NOCTTY)) < 0) {
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if (errno == EACCES)
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--
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2.13.6
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39
libconsole-never-return-empty-list-from-getconsoles.patch
Normal file
39
libconsole-never-return-empty-list-from-getconsoles.patch
Normal file
@ -0,0 +1,39 @@
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From: Petr Mladek <pmladek@suse.com>
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Date: Mon, 11 Dec 2017 16:32:11 +0100
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Subject: libconsole: never return empty list from getconsoles()
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Git-commit: d7fe84cd6198c4acc00a59d7c403fe6bdc3f509a
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References: bsc#1071568
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Upstream: merged
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getconsoles() users expect that they get a non-empty list of consoles.
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Otherwise, they might access an invalid memory.
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There is an attempt to create fallback to /dev/console but it is
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used (assigned to *cons) only when the corresponding consalloc()
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passes. Otherwise, we should printk an error and exit.
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Signed-off-by: Petr Mladek <pmladek@suse.com>
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---
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libconsole/console.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/libconsole/console.c b/libconsole/console.c
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index 2c6bbac8989f..2f6e0b1d56d9 100644
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--- a/libconsole/console.c
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+++ b/libconsole/console.c
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@@ -662,8 +662,10 @@ err:
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if (!tty)
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error("can not allocate string");
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- if (consalloc(&c, tty, CON_CONSDEV, makedev(TTYAUX_MAJOR, 1), io))
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- *cons = c;
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+ if (!consalloc(&c, tty, CON_CONSDEV, makedev(TTYAUX_MAJOR, 1), io))
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+ error("/dev/console is not a valid fallback\n");
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+
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+ *cons = c;
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}
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/*
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--
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2.13.6
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