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egl: Ignore certain environment variables when setuid/setgid.

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Specifically, ignore EGL_DRIVERS_PATH when an application is
setuid/setgid.  And ignore EGL_DRIVER when there is a slash in it.
This commit is contained in:
Chia-I Wu
2010-02-02 16:47:53 +08:00
parent 5d8646c41f
commit 6fd8b6a9e2
2 changed files with 19 additions and 4 deletions
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5
docs/egl.html
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@@ -131,7 +131,8 @@ runtime</p>
<p>By default, the main library will look for drivers in the directory where <p>By default, the main library will look for drivers in the directory where
the drivers are installed to. This variable specifies a list of the drivers are installed to. This variable specifies a list of
colon-separated directories where the main library will look for drivers, in colon-separated directories where the main library will look for drivers, in
addition to the default directory.</p> addition to the default directory. This variable is ignored for setuid/setgid
binaries.</p>
</li> </li>
@@ -139,7 +140,7 @@ addition to the default directory.</p>
<p>This variable specifies a full path to an EGL driver and it forces the <p>This variable specifies a full path to an EGL driver and it forces the
specified EGL driver to be loaded. It comes in handy when one wants to test a specified EGL driver to be loaded. It comes in handy when one wants to test a
specific driver.</p> specific driver. This variable is ignored for setuid/setgid binaries.</p>
</li> </li>

18
src/egl/main/egldriver.c
View File

@@ -415,6 +415,14 @@ _eglGetSearchPath(void)
int ret; int ret;
p = getenv("EGL_DRIVERS_PATH"); p = getenv("EGL_DRIVERS_PATH");
#if defined(_EGL_PLATFORM_POSIX)
if (p && (geteuid() != getuid() || getegid() != getgid())) {
_eglLog(_EGL_DEBUG,
"ignore EGL_DRIVERS_PATH for setuid/setgid binaries");
p = NULL;
}
#endif /* _EGL_PLATFORM_POSIX */
if (p) { if (p) {
ret = snprintf(buffer, sizeof(buffer), ret = snprintf(buffer, sizeof(buffer),
"%s:%s", p, _EGL_DRIVER_SEARCH_DIR); "%s:%s", p, _EGL_DRIVER_SEARCH_DIR);
@@ -446,9 +454,15 @@ _eglPreloadUserDriver(void)
env = getenv("EGL_DRIVER"); env = getenv("EGL_DRIVER");
#if defined(_EGL_PLATFORM_POSIX) #if defined(_EGL_PLATFORM_POSIX)
if (env && strchr(env, '/')) if (env && strchr(env, '/')) {
search_path = ""; search_path = "";
#endif if ((geteuid() != getuid() || getegid() != getgid())) {
_eglLog(_EGL_DEBUG,
"ignore EGL_DRIVER for setuid/setgid binaries");
env = NULL;
}
}
#endif /* _EGL_PLATFORM_POSIX */
if (!env) if (!env)
return EGL_FALSE; return EGL_FALSE;