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elf: Support at least 32-byte alignment in static dlopen

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Otherwise loading a dynamically linked libc with rseq support fails,
as result of the __rseq_abi TLS variable, which has an alignment
of 32 bytes.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Vineet Gupta <vgupta@synopsys.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Tested-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Florian Weimer 2020-07-12 17:53:58 +02:00
parent 43530ba1dc
commit 48699da1c4
1 changed files with 6 additions and 0 deletions
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6
csu/libc-tls.c
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@ -112,6 +112,12 @@ __libc_setup_tls (void)
size_t tcb_offset;
const ElfW(Phdr) *phdr;
/* libc.so with rseq has TLS with 32-byte alignment. Static dlopen
requires at least 32-byte alignment as well, otherwise loading
libc.so will always fail. */
if (max_align < 32)
max_align = 32;
struct link_map *main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
/* Look through the TLS segment if there is any. */