Package: extlinux
Version: 2:4.05+dfsg-5
Severity: normal
There are at least two issues in extlinux here.
extlinux --once does not print newline after the error message.
For example (running on a read-only /boot):
# extlinux --once "3.2.0-amd64" /boot
/boot is device /dev/sda2
Bad file descriptor# _
(note the cursor position).
This is one, minor issue.
Another issue is that it actually does not check if open(2)
succeeded before trying to modify --once argument:
...
open("/boot/ldlinux.sys", O_RDONLY|O_LARGEFILE) = 4
fstat64(4, {st_mode=S_IFREG|0444, st_size=32256, ...}) = 0
pread64(4,
"\245/-Zg\27\4\243\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024,
31232) = 1024
close(4) = 0
open("/boot/ldlinux.sys", O_RDONLY|O_LARGEFILE) = 4
fstat64(4, {st_mode=S_IFREG|0444, st_size=32256, ...}) = 0
pread64(4,
"\245/-Zg\27\4\243\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024,
31232) = 1024
fstat64(4, {st_mode=S_IFREG|0444, st_size=32256, ...}) = 0
ioctl(4, FS_IOC32_GETFLAGS or FS_IOC_GETFLAGS, 0xffde860c) = 0
ioctl(4, FS_IOC32_SETFLAGS or FS_IOC_SETFLAGS, 0xffde860c) = -1 EROFS
(Read-only file system)
fchmod(4, 0100644) = -1 EROFS (Read-only file system)
close(4) = 0
open("/boot/ldlinux.sys", O_RDWR|O_SYNC|O_LARGEFILE|0x100000) = -1 EROFS
(Read-only file system)
pwrite64(-1, "\245/-Z\237p<\21\1\v3.2.0-amd64\0\0\0\0\0\0\0\0\0\0\0"..., 1024,
31232) = -1 EBADF (Bad file descriptor)
write(2, "Bad file descriptor", 19Bad file descriptor) = 19
(also fchmod(2) return isn't checked)
The same happens with --clear-once too.
Thanks,
/mjt
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