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| author |   Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-11-06 17:25:40 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-11-21 16:15:42 -0300 |
| commit | 434eca873f14f618d6c2279b54fb809fb56f2c50 (patch) | |
| tree | 9894611373fc3fa1e0ba24d89df0b4767beefd19 /stdio-common/_itoa.c | |
| parent | elf: Do not parse ill-formatted strings (diff) | |
| download | glibc-434eca873f14f618d6c2279b54fb809fb56f2c50.tar.xz glibc-434eca873f14f618d6c2279b54fb809fb56f2c50.zip | |
elf: Fix _dl_debug_vdprintf to work before self-relocation
The strlen might trigger and invalid GOT entry if it used before
the process is self-relocated (for instance on dl-tunables if any
error occurs).
For i386, _dl_writev with PIE requires to use the old 'int $0x80'
syscall mode because the calling the TLS register (gs) is not yet
initialized.
Checked on x86_64-linux-gnu.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'stdio-common/_itoa.c')
| -rw-r--r-- | stdio-common/_itoa.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/stdio-common/_itoa.c b/stdio-common/_itoa.c index 3037b0f529..48f2903ecb 100644 --- a/stdio-common/_itoa.c +++ b/stdio-common/_itoa.c @@ -16,6 +16,11 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +/* Mark symbols hidden in static PIE for early self relocation to work. + Note: string.h may have ifuncs which cannot be hidden on i686. */ +#if BUILD_PIE_DEFAULT +# pragma GCC visibility push(hidden) +#endif #include <gmp-mparam.h> #include <gmp.h> #include <limits.h> |