33 lines
1.5 KiB
Diff
33 lines
1.5 KiB
Diff
commit b933e5cef63a6c136fe57de29eba7abc51b678de
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Sun Dec 15 17:05:25 2024 +0100
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Linux: Check for 0 return value from vDSO getrandom probe
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As of Linux 6.13, there is no code in the vDSO that declines this
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initialization request with the special ~0UL state size. If the vDSO
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has the function, the call succeeds and returns 0. It's expected
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that the code would follow the “a negative value indicating an error”
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convention, as indicated in the __cvdso_getrandom_data function
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comment, so that INTERNAL_SYSCALL_ERROR_P on glibc's side would return
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true. This commit changes the commit to check for zero to indicate
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success instead, which covers potential future non-zero success
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return values and error returns.
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Fixes commit 4f5704ea347e52ac3f272d1341da10aed6e9973e ("powerpc: Use
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correct procedure call standard for getrandom vDSO call (bug 32440)").
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diff --git a/sysdeps/unix/sysv/linux/getrandom.c b/sysdeps/unix/sysv/linux/getrandom.c
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index 0dc8fa6e65b9ef6a..d3eab66a1af6229e 100644
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--- a/sysdeps/unix/sysv/linux/getrandom.c
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+++ b/sysdeps/unix/sysv/linux/getrandom.c
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@@ -246,7 +246,7 @@ __getrandom_early_init (_Bool initial)
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} params;
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long int ret = INTERNAL_VSYSCALL_CALL (GLRO(dl_vdso_getrandom),
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5, NULL, 0, 0, ¶ms, ~0UL);
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- if (! INTERNAL_SYSCALL_ERROR_P (ret))
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+ if (ret == 0)
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{
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/* Align each opaque state to L1 data cache size to avoid false
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sharing. If the size can not be obtained, use the kernel
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