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Date: Sat, 24 Jul 2021 03:56:46 +0200
From: Wolf <wolf@...fsden.cz>
To: musl@...ts.openwall.com
Subject: Re: faccessat() always return EPERM
Hello,
On 2021-07-24 04:16:25 +0300, Yuri Kanivetsky wrote:
> I'm not sure that it has something to do with musl. But experienced in
> a Alpine Linux docker container (ruby:2.6-alpine3.14) on Debian 9 or
> 10. I can't reproduce it with Alpine Linux 3.13 (container) or Debian
> 8 (host).
Cannot reproduce over here, your sample program works for me in
alpine 3.14 container running under podman.
> For example, the following program outputs -1:
Not here:
/ # ./main
0
/ # strace -f ./main
execve("./main", ["./main"], 0x7ffdaab97618 /* 8 vars */) = 0
arch_prctl(ARCH_SET_FS, 0x7f2305385b48) = 0
set_tid_address(0x7f2305385f90) = 19
brk(NULL) = 0x562e4bf54000
brk(0x562e4bf56000) = 0x562e4bf56000
mmap(0x562e4bf54000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x562e4bf54000
mprotect(0x7f2305382000, 4096, PROT_READ) = 0
mprotect(0x562e4b3a9000, 4096, PROT_READ) = 0
faccessat2(AT_FDCWD, "/", R_OK, AT_EACCESS) = 0
ioctl(1, TIOCGWINSZ, {ws_row=53, ws_col=95, ws_xpixel=21852, ws_ypixel=0}) = 0
writev(1, [{iov_base="0", iov_len=1}, {iov_base="\n", iov_len=1}], 20
) = 2
exit_group(0) = ?
+++ exited with 0 +++
Maybe you can try to strace the 3.14 and 3.13 versions to see if there
is any difference.
W.
--
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.
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