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| author | Frédéric Bérat <fberat@redhat.com> | 2023-04-26 17:26:51 +0200 |
|---|---|---|
| committer | Frédéric Bérat <fberat@redhat.com> | 2023-07-05 16:59:48 +0200 |
| commit | 505c884aeb059ee7741c23d1bfc47956bd9c2a0e (patch) | |
| tree | 447deafa691b2ed964b49e4f7d85843a4e16a540 /debug/fprintf_chk.c | |
| parent | dd8486ffc195f5fe150b2d3724c7712686cfddb0 (diff) | |
| download | glibc-505c884aeb059ee7741c23d1bfc47956bd9c2a0e.zip glibc-505c884aeb059ee7741c23d1bfc47956bd9c2a0e.tar.gz glibc-505c884aeb059ee7741c23d1bfc47956bd9c2a0e.tar.bz2 | |
stdio: Ensure *_chk routines have their hidden builtin definition available
If libc_hidden_builtin_{def,proto} isn't properly set for *_chk routines,
there are unwanted PLT entries in libc.so.
There is a special case with __asprintf_chk:
If ldbl_* macros are used for asprintf, ABI gets broken on s390x,
if it isn't, ppc64le isn't building due to multiple asm redirections.
This is due to the inclusion of bits/stdio-lbdl.h for ppc64le whereas it
isn't for s390x. This header creates redirections, which are not
compatible with the ones generated using libc_hidden_def.
Yet, we can't use libc_hidden_ldbl_proto on s390x since it will not
create a simple strong alias (e.g. as done on x86_64), but a versioned
alias, leading to ABI breakage.
This results in errors on s390x:
/usr/bin/ld: glibc/iconv/../libio/bits/stdio2.h:137: undefined reference
to `__asprintf_chk'
Original __asprintf_chk symbols:
00000000001395b0 T __asprintf_chk
0000000000177e90 T __nldbl___asprintf_chk
__asprintf_chk symbols with ldbl_* macros:
000000000012d590 t ___asprintf_chk
000000000012d590 t __asprintf_chk@@GLIBC_2.4
000000000012d590 t __GI___asprintf_chk
000000000012d590 t __GL____asprintf_chk___asprintf_chk
0000000000172240 T __nldbl___asprintf_chk
__asprintf_chk symbols with the patch:
000000000012d590 t ___asprintf_chk
000000000012d590 T __asprintf_chk
000000000012d590 t __GI___asprintf_chk
0000000000172240 T __nldbl___asprintf_chk
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'debug/fprintf_chk.c')
| -rw-r--r-- | debug/fprintf_chk.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/debug/fprintf_chk.c b/debug/fprintf_chk.c index b57d538..273051e 100644 --- a/debug/fprintf_chk.c +++ b/debug/fprintf_chk.c @@ -35,4 +35,5 @@ ___fprintf_chk (FILE *fp, int flag, const char *format, ...) return ret; } +ldbl_hidden_def (___fprintf_chk, __fprintf_chk) ldbl_strong_alias (___fprintf_chk, __fprintf_chk) |