MarcoBuster/Magisk
1
1
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Fix crash during boot in x86 platform

Browse Source 
readlinkat() may return random value instead of the number of bytes placed in buf and crashing the system in two ways:
1. segmentation fault (buf[-7633350] = ‘\0’)
2. wrong link of watchdogd, resulting dog timeout

Confirmed working in ZenFone 2 x86 series, may fix #2247 and #2356

Signed-off-by: Shaka Huang <shakalaca@gmail.com>
This commit is contained in:
Shaka Huang 2020-02-02 23:12:33 +08:00 committed by John Wu
parent ebdd6ec40c
commit 0ecfb63cd6
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
native/jni/init/rootdir.cpp
View File

@ -217,7 +217,14 @@ static void recreate_sbin(const char *mirror, bool use_bind_mount) {
struct stat st;
fstatat(src, entry->d_name, &st, AT_SYMLINK_NOFOLLOW);
if (S_ISLNK(st.st_mode)) {
#if defined(__i386__)
// readlinkat() may failed on x86 platform, returning random value
// instead of number of bytes placed in buf (length of link)
memset(buf, 0, sizeof(buf));
readlinkat(src, entry->d_name, buf, sizeof(buf));
#else
xreadlinkat(src, entry->d_name, buf, sizeof(buf));
#endif
xsymlink(buf, sbin_path.data());
} else {
sprintf(buf, "%s/%s", mirror, entry->d_name);